HomeMy WebLinkAboutJul 28, 1922 (2) AN ORD INA~TCE. <~t~. /, )
JJe~lk~til~ the ins%Jllatio~, opec%ion and ~in%enance
eleo%~iO wt~es, A~aza~us and Pl~s
HeiSts. ~ .Council ~f t~e City
The City/~f Celtic HeiSts do ordain as fell~ws:-
Sec. 1. The insp~Jetor' of Buildings and his assistants auth~ized
as electrical inspectors, are hsreby auth~ized empowered and directed
to regulate, dete~ine and have general supervision over all
electric~ apparatus and ~chine~, and the stringing,placing and
attaching of electric li~t and powez, telephone, telegraph and all
other electric wires of anyother nature w~tsoeve~, now or hereafter
placed, in or in any m~ner directly attached to any buildi~, Or any
tent or similar struct~e in the ~City of Col~bia Heights, and to
inspect and to'reinspect all such electrical app~atus, machine~
wires w~ch they consider to be of sufficient i~ort~ce or ~zard
to require such inspection, ~~~, so
to prevent fires, accidents or injuries to persons or property,
and to cause all such electrical appartus, machine~ and wire~
~ be se const~cted, placed, supported and guarded as ~ot 'to cause
fire or acci~m~ or end.get life or property; and any and all such
~letrcial apparatus, ~c~hine~ ~d wires, now existing or her~e~ter
const~ated and placed shall be subject to much inspection and
sup ervi s i~ne
z
The~ ~lec~ical Inspectors, one of whom shall be desi~at~ b~ ~e
in~ ......... g-as chief electr, ical inspector, s~l be subject
to the order ~-~-~nd direction o£ the inspector of buildings, and are
hereby vested with full authority to enter any buildings or premises
of any kind in the discharge of their duties, and to pass upon and
decide any question arising under the provisions of this ordinance
relative to the manner oft constrmution or m~terials and devices to
.be used in the erection, alSeration or repair of any electrical
apparatus, machinery, Wires or material. ~
Sec. $ WIRES NOT TO BE 'CONC~ED BEFORE INSPECTION
Paragraph A. No so called concealed wiring for which a permit is issued
~or required shall be lathed ever or in any manner concealed from sight'
until inspected and acc[~pted by the inspectors.
Paragraph B. Any person having charge of the construction, alteration
or repair of any building, or anyother person, who covers or conceals,
or .cauls to be covered or concealed, any wiring for which a permit
has been issmed or required, before the said wiring has been inspected
and appr~ved~ without having officially notified the electrical inspec-
tors-~t least(AS) forty eight hours previ~sly, shall be subject to
the penaltY provided in section Six ~6) for violation of this Ordinance
'201'
Sec. 4 PEN~LTY FOR CUTTING 0H DISTURBING ELECTRIC WIRES,etc.
Any person, except the duly authorized electrical inspectors, who.
shall cut, disturb, ~lter or change, or cause to be cut, disturb,
a,lterred or changed, ~ny electrical wires, cut oUt, fuse, appara~tus,
~chi~y or m~teri~l in such a ~nher as to render the same inopera-
tive, defective or not in accordance with the provisions of this
ordinance, shall be subject to the penality provided in sJction (~)
six for violation of-this ordinance.
Sec. ~. D~ECTI~ ~P~TUS ~D ~T~.
Par~grapgh A ~y ~d ~l dynamos, motor~, ~wires or other ~chinery,
apparatus, or m~terial used for electrical purpose which may at any
ti~ become so defective a~ to be likely, i~n the opinion of the
inspector, to cause fires o~ accidents or to endanger persons or
property, s~ll be cond~ed by the inspector, and upon such cendeE~
tion the person or persons owning or usi~ the ssme shalI ~i~ediately
cause the same to be put into a ~safe condition.
Paragrap~ B. In case of any person or of persons owing or using any
electric wires, dynamos, motol's, or anyother electrical apparatus,
or material of anyother nature whatsoever, which have been condemned
by the inspector shall fail to have the same put into safe condition~
and ~~ee~ by the inspector, within (48) forty eight hours ~fter the
ss~ne have been condemned, or within such other reasonable length of~
time as shall be prescribed by the inspector, then it shall be the
dutyCUt o~t esa~w~ e.~nsp ec~r°r b Ot~oerremov~mean c ~ l~s~/e dio~C~ tto be disconnected
the condemned wires, app~ratus~ or materi~l from tShe source of elec-
tric~l energy.
Paragraph. C. And when any electric wires, ~JSynamos,. motors or electric'
al appa~atus~ or mater~A1 of auy nature whatsoever have been in any
manner ~liscoDnected ~nd renderred inoperative by the inspector, as set
%orth in the foregoing p~-ovisions, it shall be unl~v~ful for any person
or persons to in any manner reconnect the same or cause the same to be
reconnected ~to any source of electrical energy, or to use the same as
a part of any electrical system, until they have been put~ in ss~fe
condition and a certificate of acceptance ha~ been issued by the
inspector.
Sec. 6,· PENALITIF~0R VIOLATION OF THE ORDINANCE.
Any person or persons who shall violate any provisions of this
ordinance or who shall' fail to comply with any oi~ is requirements,
shal~ be subject, upon conviction thereof, to a fine of'not less
than $10.00, Ten DolLars, nor more than ($100.) One hundred dollars,
for each offense~ and amy be imprisoned~Until~
such fine is paid,
not exceeding 90 days(ninety days).
203
Each and every day's continuance of any violation of the provisions
of this ordinance shall be and be deemed a separate offense.
Sec. 7 METERS. Meter Loops and meters sh~ll not be located in
clothes ~losets~ bedrooms, bathrooms, attics or in rooms where the
Visits of the meter readers and testers would inconvenience the
occupant, unless no other location is'available.
MATERIALS AND FITTINGS. SEC. 8. ~-
All m~terials and devices used for electrical purposes under ~he
provisions of this ordinance must~be specified in the -- "List
of Approved Electrical Fittings", publi'shed by the'National Board
of Fire UnderwriterS, and kept on file in the ~, cfi'ice of the City
Electrical InSpector. In the event of proposed or intended use
not
of meterials, devices and methods of installatioH/~pecifically
covered by this ordinance, it shall be the duty of the electrical
contracto: to secure permission from the electrical inspectorSto use
such materials, devices and methods, b~fore so doing.
Sec. 9 ARMORED CABLES.
Parag:aph A. Armored cables will be approved for open wires; but not
for concealed wiring, except in old buildings for fish work, and in
all buildings in places where rigid or flexible conduits is imprac-
ti cable.~
Paragraph B. Must be continous from outlet~ to outlet or to junc.tion
boxes and cabinets and the arnor of the cables must properly enter
and be. secured to all fittings, a~ithe entire system must be mechanic-
ally secured in position.
204 ·
Paragraph C. ~ust~be equipped at every outlet with an appr0.~ed'
outlet box or plate, as required in conduit work.
'Paragraph D. Must have 2 or more conductors of the circuit in one
metal ~ armor.
Sec. 10 Batteries, Storage and Primary;
Paragraph (a) When currant for light and power is taken from
primary or secondary batteries, the smae general regulations must
be observed as apply ":rom similar apparatus fed from dynamo generators
developing the same difference ofpptential.
(b)storage battery rooms must be thoroughly ventilated.
All secodary batteries must be mounted on non-absorbptive, non-
'combustible insulators, such as gl~ss or thoroughly vittirfied and
glazed porcelain,
Secti__..._2~n ~.~..
Approved bushings will be required in all places
where wires pass thzcough obstructions.
(b) In ordinary conmtruction, with knob and tube work, porcelain tubes
will be accepted for protecting ~vires through walls, ect. if of
sufficient length to pass through and extend at least one-halfl/2~
beyond the obstruction.
(c) In perfectly dry places non-metalllic flexible tubing may be used
as a substitute ~wx~xx~ for the pordelain tubes, in which
case the tubing must extend conti~nously from the last porcerlain
support on one sids to the first porcela~u support ~ beyond.
(D) Non I~ettallic flexible tubing must be used i~q knob and tube con-~
struction for outlets.
(E) Apl~rOved bushings must be used for cords in sockets and outlet box
C overs.
(F) Approved bushings mu~t be used where conductors enter boxes,
cabinets and conduit fittings~
CABIh~ETS. Section 12. (A) Must be substantially constructed of
non-combustible, non-~bsorbtive material,such as sheet steel or other
similar material.
(B) The Minnimum thickness of sheet steel used for such cabinets shall
be I~o. 16 ¥. S. gauge.
doorS'to clos~ with steLtches fully open, and to provide ample clear-
anco for current carrying parts of the fuse-blocks and switches
contained.
(C) Doors must ~e provided with strong hinges ~and catches, and should b
be fitted so asto render the cabinet dust proof.
13 CAIlRYING CAPACITY 0F WIR~,8.
The following table showing the allowable car~ying capacity of
~ copper wires and cables of 98 ~ninety ~ight) per centgonduct-
ivity, according to the standard adopte& by the American Institute of
El%ctrical ~nginee~s, must be followed ~n placing interior conductors~
~ Di~tor of Area in Table A.. ~ Table B. Table C.
Gauge,SolidWires,Circular,Rubber in ~arnished Other insulation
18 40. ~
16 50.8
12 ~ 80.8
10 101. g
8 1:~8; 5
6 16 2.0
5 18~. g
A 204.3
3 229.4
2 257.6
1 289.3
0 325.0
00 364.8
000 409.6
o0oo 46 o. o
in mills, Mills, sulation
Amperes.
1624 ~
2583 6
4107 15 18
6530 ~ 20 25
10380 25 30
16510 35 40
2~250 5O 6O
331OO ~55 65
41740 70 85
52~30 8O 95
66370 go 110
8~g0 100 120
105500 125 150
133100 150 180
167800 175 210
z~O~O0 2~0 m4o
211600 225 270
250000 250 300
300000 275 350
350000 300 3~0
400000 ~25 390
500000 400 480
600000 450 540
700000 500 600
800000 550 ~ 660
900000 600 720
1e~0980 650 ~ 780
1100000 690 830
1200000 730. 880
1~00000 770 920
1400000 810 970
1500000 850 1020
1609000 890 1GTO
1700000 930 1120
1800000 970 1160
1900000 ,1010 1210
2000000 1050 1~0
insu!at i onAmperes,
(01ot~)
Amperes
10
20'
25
50
5O
7O
80.
90
100
125
150
2OO
225
275
300.
325
35O
400
450
5O0
6O0
68O
76O
84O
92O
1000
1080
1150
1220
1290
~ 1560
14~0
1490
1550
1610
16 70
~ One mill 0.001 inch ..
~Fe
ction 14 DECORATIVE LIGHTING SYSTEM. Special permission may be
given in writing by the electrical inspectors for the temporary
installation of approved systems of decorative lighting, provided the
difference of potential between the wires of any circut shall be not
over 150, one hundred and fifty, volts, and also provided that no
group of lamps requiring more than (1000) one thousand watts shall be
dependent upon one cut out. ~ww
Sec. 15 Electric Heating Devices.
(a) Each element of 1000 wats, $r over, n~Ast be separs, tely fused,
and no group of elements ~on the same branch fuse must total over 1000 z
watts.
(b) Switches and pilot lights must be used with non-indicating portab,l
le heating appliances, unless such appliances are connected to recept-
acles of the pull out type.
(c) Heating~devices must never be concealed, but must at all times
be ~in plain sight unless properly protected and ventilated.
~d) Flexible Conductors for all ~heating devices requiring over 250
~_~_~ watts must have approve~l abestos covering~ ~
(e) For portable heating devices, the flexible conductors must be con~
nected to' an approved plug device, so arranged that the plug will
pull out and open the c ircut in case an abnormal strain is put on
the flexible conductor. This device ~a~y be stationery, or it may' be
placed in the cord itself. T.he cable~ or cord must be attached to the
heating apparatus in such manner that it will be protected from kinking
chafing, or like injury at or near the point of connections.
(f) Smoothing irons, ss.d irons, and other heating appliances that
are intended to be applied to inflamable articles, such as cloth~ing,
must conform to the above rules so far as they apply. They must~ also
be provided with and approved stand, on which they should be pl~aced
when not £n use.
(g~ Stationery electric heating apparatus, such as radiators, ranges
plate warmers, etc. must be placed in a s~-fe location, isolated from
Anflamable material, and be treeated as sources of heat.
Electrical heatin;~evices m~st be provided with name pla~e,
~iving the maker's name and the no_~m~l capacity in voIts and amperes.
Sec. 16 Fixtures.
(~) Fixtures must have all burrs and fins removed before the conduc-
tots are dr~'wn in.
(b) Fixtures must be free from short circuts or contacts between same
and conductors and must be tested before being connected to supply
conductors. (c)All fixture arms made of tubing smaller than 1/2"
one half inch outside dis_mater, also the arms of all one-light
bracketts, must be secured after they are screwed into position by
use of a set screw properly placed, or by soldering or cementing or
some equally good method to prevent the arms from becoming
screwed. Arms must not be ~aade of tubing lighter than #18 Brown &
Sharpe gauge,and must have at screw joints not less than(5)five
threads all engaging. (D) Conductors in fixtures must not be
less than No. 18 B & S gauage.
E & ~, ~(No~ng under these paragraphs)
G Fixture Conductors must not be spliced except ~here taps are
made, and must be flexible cord~ in chain and adjustable fixtures.
H. Under no circumstances must there be a difference of potential
of more than ~00 volt~s between wires contained in or mttached to the
fixtures.
Se~. l? Flexible Cords.
A Flexible cord must not be run on walls and ceilings. Provided,
however, that with pendant Switches, portable cord may be rt~n on
ceilings, if on knobs, a distance of not toot exceed 1S inches, in
which case the cord itself must be supported from an approved tie-
button.
B Flexible cords must not be used in show windows, except in fix-
tures, but approved portable cord may be used for pbrt~ble appliances.
C Nust $.ot be used as a support for clusters~ nor for any device
which weights more than 2 pounds, unless cords of a~ldi~ional capacity
or strength be used, and when an approved supporting device is
employed.
D Must not be used where the difference of potential between the two
wires exceeds ~00 volts. This rule does not apply to the greundmd
circuts in street Railway property.
E When the lamp or other device is subject to being m~v~ed about,
ordinary pendant cord~ will n~t be accepted, and approved portable
cord cord must be used. l~p
2 Special cords approved for us in laces and for heating devices,
will be required.
Sec. 1S Fuses, Par. A. All fuses must be enclosed in approved cut-out$
cabinets or fire proof enclosures, l~re~ided, however, that enclosed
fuses may be used on switch boards which are properly loaated as
provided under regulations for switch boards.
D, Open length fuses will not be permitted. C. All fuses and fuse
blocks must be so pl~aced that sufficient spacing will be allowed as
provided under sec. ~4. D. Fuses must be placed on all under-
grounded service wires at the nearest suitable place to where the w
wires ente~ the building, w,. Fuses mast not be placed in any
grounded neutral except brancl~ circut wireg. ~.Must be placed at
the nearest acces@ible poiSt where a change is made in the size of
the wire, unless the cut out in ~he larger wire will protect the
smaller. G. No main or br~nch fuse block of capacity less than ~0
amperes will be accepted. H. The branch fuses for 1000 wats lighting
or power circuts must no~be larger than~ ~, six, amperes ~or (2§0)
two hundred and fifty, volts, and ten, (10) amperes for (12~)'
one hundred~twenty five, volts. X.~J~ust be~ so placed that no set of
· incandescent lamps requiring more than (1555) &ne thousand wats,
whethmr grouped on one fixture or on several fixtures, or pendants,
will be dependent upon one cut-out. ~. The above rule shall' also
apply to motors when more than one is dependent upon a single cut
out. K. Ail branches or 'taps~ from a thr~e wi~e Edison sysstem
mus~ be run as two' wire 'circuts. L. Not more than 1000 wats or more
then 18 sockets shall be permittted on each branch circut of more than
one ligh~, motor or other device.
Sec. No. 1~. PUBLIC GAP~AGES. For the purpose of this' rule a public
garage i$ considered as that building or portion of a lm~ilding in
which ~ (three) or more self propelled vehi~cles~ carrying vola~X~e
inflamable liquid for fuel or power are kept fpr use, sale, storage,
rental, repai~, exhibition or demonstration purposes; and all that
portion of the building that is on or below the floor or floors on
which such vehicles are kept which is not separated therefrom by
tight unpierced fire walls and fire resisting floors.
In addition to the general requirements of this ordinance, the following
rules shall apply;
20-7
(H) Motors Or dynamos not actually a part of a vehicle~ if not
located at least A feet above the fl&or must be of the fully enclosed
type, Motors located $ feet or,mcr? above the flo~r, if not of
the fully, enclosed type must be provided wi~h wire screen of not
less than No. lA mesh ~er openings at co~utator end.
G~TORS.
Sec. 20/ (a) Must be located in a d~ place.
It is reeo~ende~ t~t ~ter-proef covers be provided, ~ich m~y be
used in case ef emergency. (b) ~ust never Be placed in a room ~ere
any hmza~o~ p~cess is c~rried on, no~ in place~ ~ere they ~uld
bec~me e~sed to infla~ble gases or .flyings of combustible ~terials.
(e) Ge~e~tors must ~v'e their f~s properly grounded. (~) Constant
~tential g~e~t~re, except alte~ating current ~inee ~and their
exciters, must be protected f~m excessive current By :safety fuses or
equivalent devices of approved design. ~er t~-~re, direct-current
genera~ora, single ~le protection will be consider~ 'as satisfying ~e
above ~le, provided the safety device is located in the lead not con-
nected to the series ~nding. ~en sullying three-~re systems, the
gene~tor should be so arranged t~t those protective devices. ~11 cede
in the outside leads. For three-~re, direct current gene~tors, a
safety device must be placed in ~ch a~ature, direct-current lead, or
a double ~le, double trip circuit breaker in each outside generat~r
l~d and corresponding equalizer connection. ~ere the needs of the
se~ice ~ke th~ above requirements imp~cticable, the ~ectrical In-
spectors, ~y, in ~iting, modify the~. (e) Must each Be provided
~th a n~e plate,, giving the ~ker's n~e, the capacity in v, lts and
~peres, and the noel speed in revolutions per ~lnute. (f) A
competent m ~st Be kept on duty ~ere generators are operating.
GR0~S ~ Section 21.
(a) ~e ~ring in ~y building muw~ test free f~m grounds; I.e., the
o~nplete installation must have an insulation between conductors and
between ~11 conductors and the ground (not including at~c~ent8,
209.
210 '
sockets, receptacles, etc.) not less than that given as follows:-
tot % amperes, 4.,000,000 ~ms.
# 10 # 2, ~000 ~000
" 25 " ~00; 000 "
" ~0 " 4.00,000
,r ' 100 " 200,q00 "
" 200 " 100,000
" 4.00 " 5'0,000 "
" 800 " 2%,000 "
" !,600 # 12, %00
The test must be made with all cutouts and safety devices in place.
If the lamp sockets, receptacles, electro[iers, etc., are also
connected, only one-half of the 'resistance~specified in the table
will be required. (b) For signal systems the ground wire of the
protective ~evice shall be run in accordance with the following
requirements:
f!Shall be-of 'copper not smaller than .Wo.18B. and S.Gauge.
Must have an approved insulating covering as described
for volZag~s ~from 0 to 600, except that the preservative
compound specified may be omitted.
(3) Must run in as straight a line as possible to a ,good
permanent ground. This may be obtained by connecting to a
water or 'gas pipe connected to the street mai'ns or to a
ground rod or pipe driven in permanently damp earth. When
connections are .~_de to pipes, preference shall be given to
water pipes. If attachment is made to gas pipe, the connen-'
tion in all cases must be made between the meter and the
street main. In every case the connection shall be made as
near as possible to the earth. When the ground wire is
attached to water or gas pipes, these pipes shall be
thoroughly cleaned and tinned with rosin flux solder, if
such a method is practicable; the ground wire shall then
be wrapped tightly .around the pipe and thoroughly soldered
to it. ,~hen the above method is impracticable, then if
there are fittings-where a' brass pl'ug can be inserted, the
ground wire shall be thoroughly soldered to it; if there
are so such fittings, then the pipe shall be thoroughly
cleaned and an approved ground clamp 'fastened to an ex-
posed portion of the pipe and the ground, wire well soldered
to the ground clamp.' ~nen the ground wire is attached to
a groun~d rod driven into the earth, the ground wire shall
be soldered to the rod in a similar manner.
Ground conductors for conduit must be at least equivalent to
~o. 10 B. and S. Gauge copper wire where the largest wire in the
conduit system is not greater than ~o. 0 B.and S. Gauge, and need
not be larger than :Ro. 4. l~. and S. Gauge where the largest wire
in 'the conduit system is greater than ~o. 0 B. and 8.. Gauge. (d)
(d) In 'general, all ground wires, specified in paragraph (d) Shall
be rubber'covered and run on insulating supports or pretested in an
approved w~nner. (e) Tn single phase systems, where conduit is used,
the neutral must be grounded on the line side of the entrance switch
to the conduit or other ground by a conductor of equal siz~ to the
conduit ground wi-re.
Sectio~ 22. Stranded wires (, except in flexible cords) must be
soldered before being fastened under clamps or binding screws, and
whether stranded or solid, when they have a conductivity greater
than that of No. 8 B ahd S. Gauge, they may be soldered into lugs
for all 'terminal' connections, except where an approved solderless
terminal connector is used.
Section 23. (a) The use of motors operating at.a potential ef over
600 volts will'be approved only when every practical safeguard haz
been provided. Plane and specifications for installing high tension
systems (Over 600 volts) must be submitted to and approved by the
~le~trical Inspector before the work is commenced, lb) lfust have
ne exposed live parts, unless properly guarded, and,. when stationary,
have 'their frames permanently and effectively grounded. (c) The
motor leads or branch circuits must be designed to carry a current at
least twenty-five (2%) per cent greater than that for which the
motor is rated, in order to provide for the inevitable occasional
overloading of the motor and the increased current required in
starting, without overfusing the wires; but where the wires under
this rule would be overfus~d, in order to provide fox-the starting
current, as in the case of many of the alternating current motors,.
the wires must be of such size as to be properly protected by these
larger fuses. (d) The following table is provided for the conven-
ience of the contractQ~ in figuring wire sizes for motors.
21-1
Deviation
from the same can be m~de only by ,written consent of. the Electrical
Tnspector. Tn using this table for figuring size of any main or
sub-feeder to a group of motors, add the starting qurrent of the
:~,tor which requires the greatest starting current to the running
current of the balance of the motors on the feeder or-sub-feeder in
question. (e) Column "A' gives full load current. Col,,wm #B# gives
the size of the wire that must be used for squirrel-cage motors with
compensators or star-delta connection, from the feeders to the Funning
fuses. Column "O# gives the size of wire that must be used from the
running fuses to the motor. Col--m "D# gives the size of the wire
that must be used for squirrel-cage motors without .compensators.
Wires having a carrying capacity of one hundred fifty per cent (1%0%)
of ¢olu~ "A# may be used for slip-ring and repulsion motors, or for
any motor leads protected by approved time limit devices.
AL T]~RNAT lq~G CURP~
Single Phase 220 Volts.
Wire from
Switch to
Amp.100% Running Fuses
Full Load
Wire from
Running Fuses
to Motor
.Load) ,
C.
l, 14
' 6' 14 14
11. ~ 10 l&
16. 8 12
22. 6 10
26. 8
Repulsion
(1 0%
Full Load)
14
14
14
12
10
8
Three Phase 2300 Volts
Full Load
Phase
WO u~d ..
10
10
10
10
8
Three Phase 2'20 Volts
2.13
H.P. Amp. 100% Size Wire Wire Fuses
Full Load ]3 'and S. to ~otor
Sq. Cage 12~% Full
~Xotor with Load
comp 25o
Full Load
10
30
Size Wire
]3. and S.
Sq. Cage
Mo to r With-
out Comp..
Load
D.
14
'10
Load
, E~.
....
14
14
12
10
3
1
0
2-0
2-0
3-0
Three Phase 440 Volts
12
12
10
(f) High Potential motors should 'preferably be so located that the
a~ount of inside wiring will be reduced to a minimum. (g) The
line aero, ice for high tension systems within buildings must be pro-
main fuses and circuit breaker provided with both overload
aN no voltage release. (h) The overload coils or transformers must
be on the line side of the c~rcuit breaker, and all meter connections
must be made on the load side of the circuit breaker.
(i) '~ach motor
and resistance box must be protected by a' cutout and' controlled by a
2i4.
switch, said switch plainly indicating whether 'on' or #off'. l~ith
motors of one-fourth (1/4) horsepower or less, on circuits where'
the voltage does not exceed three hundred (300), single pole switches
may be used: The switch and rheostat must be located within sight of
the motor, except in cases where special permission to locate them
elsewhere is given, in writing, by the Electrical Inspector. (J) The
use of circuit breakers with motors is recommended and may be re-
quired by the Electrical Inspector. (k) Inverse time-limit devices
must be protected by fuses of a capacity not greater than three times
the allowable carrying capacity of the conductors protected by said
inverse time-limit devices. (1) Startin-rheostats, and auto*starters,
unless equipped with tight casings enclosing all current carrying
parts, should be treated ~e~ the same as knife switches, and in all
wet, dusty or linty places, should be enclosed in dust-tight, fire-
proof cabinets. Yf a special motor room is provided, tl~e starting
apparatus and safety devices should be included within i~. (m) Ail
alternating current squirrel-cage motors whose normal capacity is
more than five (%) horsepower must be provided with approved compen-
sator or equivalent device to reduce the excessive starting current
required; and direct-current motors of one (1) horsepower capacity,
and larger, must have starting boxes. (n) Motors of one (1) horse-
power or more capacity must be so wired that, in the running position
~T the starting switch, fuses or similar automatic circuit-breaker
will be inserted in the motor leads. These running fuses must not
be larger than to provide for a twenty-five (2%) per cent overload,
unless wired for greater capacity; but in no case m, ust these fuses
be larger than to provide for a fifty (%0) per cent overload. The
insertion of the running fuse may be accomplished by the use of a
double-throw switch or similar device, in which case means whereby it
would be impossible to leave such switch in the starting position
will be required. Provided, however, that these additional x-Jnning
ffuses will not be required in the case ef direct current ~ter~, nor
of alter~ating-current motors of the repulsion and phase-wound type,
{o) '~t each ~e provided ~th a n~e:plate, ~v~n~ the ~ker~s ~e
' the noel ~c~ty ~n volts and ~peres and the noel speed ~n
revolutions per minute.
Sectiez 2~. ~e use of ~oden ~di~gs s~ll not be pe~itted.
Approved metal mouldings ~y be used only by special pemissien, in
~iting, f~m the ~ectrical lnsPeeterS~ and ~en used must be in-
atall~ under the following reg~ations~
(a) ~ust be continuous from outlet to outlet, to J~tion boxes, er
app~ved fittings deeign~ especially for use with"metal moldings,
and must at all outlets be p~vided with approved te~i~l, fittings
which'will p~tect the insulation of conductors from ab~sion,
such protection is afforded by ~e construction of the boxes or fittings.
(b) Such ~ulding, ~ere ~ssing throu~ a ~oor, must be carried
th~.~ an iron pipe extending'f~m the ceiling below-a poi~ five(
feet above the floor, ~ich ~11 se~e as an additional mec~nical
p~tectien and exclude the presence of moisture often prevalent in
such locations. (c) Backing must be gecur~ in ~sition by acre~ or
bolts, the heads of which must be flush with 2he metal. (d) The metal
of the molding must be pe~nently and effectively g~ded, and must
be so install~ t~t adjacent lengths of moulding will be mechanically
and electrically e.ecur~ at all points. (e) ~at be installed se
the t~ or ~re wires of a circuit ~11 be in ~e s~e metal moulding.
(f) Ail ~res installed in such ~ulding must ~ve an app~ved rubber
instating covering, ~nd~must be in Continuous lengths f~m outlet te
outlet, or f~m fitting to fitting, nO Joi~ts or taps to be ~de ~thin
any such molding. ~ere b~nch taps are-necessary, in moulding
'app~ved fittings for this pu~oee must be used. (g) '~etal moulding
~st not b~ us~ far eir~ite r~uiring ~re. ~n 1,00~ ~tta.ef enemy,
215.
*~'~Vnor where the difference of potential Between any two wires in the sa~e
moulding is more than three hundred (300) volts.
Section 2~. (a).Any arc lamp used as a part of a moving picture ~ch~ne
or thereopticon must Be constructed similar to arc l~ps off theaters, and
wiring of s~e must not be off less capacity t~n No. 6 B. and S. ~uge.
(B) ~eos~ts must confform to rheostat requir~ents for theater arcs.
(cj ~chines must be operated by ~nd, and motor drive ~11 not
~itted. P~vided, however, t~t the ~ectrical Znspectors, ~y, at
their discretion, ~e~it motor drive in the case of special ~chines
a t~e e~ressly and pro~erly.deeigned flor such ope~tion, wh&n
charge off a skill~ ope~tor. (d) Any moving picture ~chine, now or
he~ffter installed, must Be ~laced in an enclosure or Booth ~de
suitable fireproof ~terial, Be thoroughly ventilated and large enough
for ope~tor to ~lk freely on either side, or back of, ~chine. All
openings into this booth must be arranged so as to be entirly closed
By ~cors or shutters eonstructed off the same or eq~lly good fire-
resisting mterial as the booth itself. Doors or covers must be
ar~nged so ae to Be held noilly closed by spring hinges or equiv-
alent devices. (e) 8rooking in this enclosure is positively prohibited.
Section 26. D~finition: ~nsofmr as these ~es and requir~ents are
conce~, the te~ "moving picture theater", shall mean a building~or
portion of a building in which it is designed to give ~tion picture
e~ibitions ~o ~ich the Publi~ are admitted for a fee, or other~se,
and ~ich involve the use of a moving picture ~chine or device for
eho~ng such pictures through a film. Ail electric wiring and equi~
merit in moving picture theaters s~ll be installed in accordance with
the following requirements: (a) Ail pe~nent electric wiring must
be done in ~ved conduit. P~vided, however, t~t a~ored cables,
metal mouldings, or other approved special construction, ~y be used
by special pe~is~ion of the ~ectrical Inspectors.
:217
5eotion 27. (a) Ail receptacles used in ~flush work must Be placed in
metal enclosures as provided for flush switches. (b) Ordinarily,
receptacles for floor work must be enclosed in approvSd water-tight
Boxes. However, in residences, the encIOsing box need not be water-
tight when placed in hardwood floors and not subject to wash-water.
It is always desirable to place such receptacles in walls and base-
boards, to prevent admis.ion of moisture as well as dirt and metallic
substances, l~or large capacity receptacles see rules 'for theaters.
(c) Ail receptacles or sockets, which are to be used for portable
applia~ee~ and devices must mot be of the screw type.
/R]~SISTANCE BOXES' AI~D ,RILEOSTATS: ......
Section 28. (a) ]~ust Be pl&'c~d ena swttch~oard, or if not th'croon,'
at a distance of at least one (1) foot fr~m COmbustible material, or
separated therefrom By a non-combustible material such as asbestos,
elate or marble; and in all cases they must Be r~gidly:..'secured in
place. If resistance devices are installed in rooms where dust or
combustible flyings would be liable to accumulate on them, the~ should
be equipped with a dust-p~oof face-plate. (b)' Wherever insulated wire
is used for connection between resistances and the contact'plate of a
rheostat, the insulation'must be slow burning.
Section 29. (a) Fused rosettes will not be approved. (b) Rosettes,
wall sockets and receptacles must have no exposed~live terminals.
Section 30. (a) By show'window is meant an enclosure or space on the
inside of windows which is ~r could Be used for the display of merchan-
dise. (b) Ordinary pendant cords will not be approved in show windows,
as provided in Sec. 17 B. (c) All wiring in show windows must be done
in iron conduit, armored cable or approved metal moulding.
2i8
Section 31. (a) All signs outside of building, or otherwise exposed
to dampness must be constructed in such manner as to be waterproof,
and all wirings, sockets and other fittings for same must comply with
requirements for damp places. (b) Electric signs must be constructed
entirely of metal, glass, porcelain or other non-combustible material;
except that wood letters and metal clad wood moulding may be used on
the exterior of such signs when placed at least two inches from the
electric lamps, provided, 'however, that the width of such metal clad
woo~i mouldinj or of the wood forming such permissable wood letters
shall at no point exceed two (2) inches. (c) Sheet metal used i.,n
constructio~ of electric signs mu. st not be less than l~o. 28 U. S. metal
gauge. Ail metal must be galvanized, enameled or treated .with at least
three (B) coats of anti-corrosive paint or compound. (d) Bottoms of
signs for outdoor use, or otherwise exposed to dampness, must have
sufficien, t draifl' holes at least one-quarter (1/4) inch in diameter.
(e) In no sign shall more than 1,000 watts be dependent upon th.e final
cutout.
Section 32. (a) Signaling systems governing wiring for telephone,
telegraph (except radio signaling apparatus), district messenger and
call-bell circuits, fire and burglar alarms, and all similar systems
which are hazardous only because of their liability to become crossed
with electric light, heat or Power circuits. (b) Wires on the outside
walls of buildings must not come nearer than four inches to electric
light or power wires, except when in conduit, unless separa, ted there-
from by a continuous and firmly-fixed non.-conductor, to maintain
permanent separation; this non-conductor to be in addition to the.
regular insulation on the wires. (o) Metal sheathed aerial cables
which are liable to contact with electric light or power wires shall
have the sheath interrupted close to the entrance to the building by
2i9
means cf an insulating ~oint or equivalent means. (d) ~ne gro~{ wire
of the protective device shall be run in acco~lance with requirement{
8hall be mounted on non-oombu~tible, non-absorptive insulating
bases¥ so designed that .when protector is in place all parts which ~ay
be alive will be' thoroughly insulated from the surface on ~hich the
protector is mounted,
Shall have the folliwng 'parts.,
An arrestor between each line wire and ground.
A fuse in each line wire.
(f) The .following rules apply to all systems, whether the wires from
the central office to the building are overhead or underground. Wires
beyond the pro'tector, or wires inside buildings where no protector is
used, must be neatly arranged and securely fastened in place in some
convenient, workmanlike manner. They. must not come nearer than two
inches to any Yelectric light or power wire in the building, except
when in conduit, unless separated therefrom by-some continuous and
fir~. y fixed non-conductor, creating a permanent separation; this non-
conductor to be in addition-to the regular insulation on the wire.
(g) Wires where bunched together in a vertical run within any build-
ing mUSt have a fire-resistive.covering sufficient to prevent the
wires from carrying fire from floor to floor unless they are run either
in non-combustible tubing or in a fire-proof shaft, which shaft must be
pr. ovided with fire stops, at each floor. Signaling wires and-electric
light or power wires may run in the same shaft, provided that one of
these classes of wi, res is run in non-combustible tubing, er provided
that when run otherwise these two classes of wires shall be separated
from each other by at least two inches. ~n no case shall signaling
wires be run in the same tube with electric light or power wires.
{h) Transformers or other devices for supplying current to signaling
systems from l~ht, heat or power circuits must be of a design
220
expressly approved for this purpose. The primary wiring must be in-
stalled in accordance with the rules for light wiring and the se
wiring in accordance with rules for signal wiring.
PAD ~,,0 .$ !.~I~A~LZ~G APPA. RATUS~'
(i) All wiring pertaining to radio signaling apparatus must sonform
to the requirements of this ordinance and must in addition comply with
the following specifications: (J) When the aerial is parallel to
other wires the distance between aerial and such wires should not be
less than 1/2 the length of the aerial. (k) Aerial conductors must
be installed and constructed to prevent accidental contact with con-
ductors carrying a current of over 600 volts. Aerial supports must
be constructed and installed in a strong and durable manner. Aerial
conductors and wire. leading from same to ground switch must be mounted
firmly on approved insulating supports which m~y consist of wood ( not
iron) pins or brackets equipped with porcelain knobs of approv, ed
design or petticoat insulators. Insulators must be so installed as to
maintain, the conductors at least five (%) inches clear of the surface
of the building wall. In passing the aerial conductor through the
side of the building a continuous tube or bushing must be used. The
bu~shing or tube must be composed of approved insulating material and
must extend five (%) inches beyond the 'surface of ,the wall on both sides.
Porcelain tubes will not be approved. The ground switch shall be
mounted so that its current carrying parts will be at least five (~)
inches clear of the building wall and located preferably in the most
direct line between the aerial and the point of ground connection.
The conductor from ground switch to ground connection must be securely
supported. (1) Aerial conductors must be effectively and permanently
grounded at all times when station is not in operation, by a con-
ductor, the periphery of the .cross-section of which is not less than
thre. e-quarters of an inch. The ground conductor must be of copper or
a~k~a~ other metal which will not corrode excessively under existing
conditions.
221
(m) Motors, transformers, generate.rs, etc.., must have their frames
efffectually grounded, (n) The key of & spark type: set must not be in
the grounded wire of the circuit. Is) When the current ~s taken from
lighting or power circuits for a spark set., the low frequency wire8
must be run in iron conduit or armored cable, and there must be' pro°
vided two 500 ohm non-inductive resistances in series across the line
with mid-point grounded.
Section 33. (a) In rooms wherein inflaz~nable gases ,~y exist, the
incandescent laarp and socket ~st be enclosed ina vaper~t~ht glebe,
and supported on a pipe-hanger, wired with approved rubber, covered
wire soldered directly to the circuit. (b) In wet places,
proof' sockets must be used.. Unless m~de up on fixtures they must
be hung by separate stranded rubber-covered wires not sma. ller tha~
No. 14 B. and S. gauge, which should preferably be twisted together
~hen .the pendant is over ti~ae (3)' feet long. These wires, must be
soldered directly to the circuit wires, but supported independently
of them. (c) Lamp sockets within eight (8) feet of the'floor must be
constructed of porcelain or other approved insulating mater,iai when
installed over tile, cement, or earthen floors or close to sinks,
lavatories or bath tubs; and such. construction shall be required.
for all lamp sockets installed near any o,ther conducting materA&ls in
such w~nner that, in the opinion of the ~lectrical Inspector, it
would.be possible for a person to form a conducting path through hie
body to the ground. (d) No medium base lamp socket of less than 660
watts capacity will be permitted, and no lamp socket can be used to
supply more than six hundred and sixty (660) watts, unles's specially
designed to provide a greater capacity.
Section 3~. ~[ust be so arranged that under no circumstances will there
be a difference of potential of over six hundr, ed (600) v~lts between
any bare metal parts in any distributing switch or cutout cabinet, or
222
equivalent center of distribution.
Section 35* (a) ~ust be so placed~as to reduce to a minimum the
danger of communicating fire to adjacent combustible m~__terial, and
special pe~ieelon must~ be secUred from the ~ectrical Ynspector to
place switchboards in localities other than engine ~oms, for in engine
roo~ they ~uld be under e~ert supervision. Switchboards must not be
built up to the ceiling, a s~ce of three' feet being le~t, if possible,
between the ceiling and the boa~. ~e space back of the 'board must be
kept clear of rubbish and must not be used for stooge. (b) Must be
~de of non-'combustible, non-absorptive, inSUlating ~terial. (c) Must
be accessible from all sides ~en the connections are on the back, but
~y be placed against a brick or stone ~11 ~en the wiring is entirely
~ the face. Yf the wiring is on the back, there must be a clear space
of at least eighteen (18) inches between ~he ~11 ~d' the apparatus on
the boa~, and even if 'the wiring is entirely on the face, it is much
better to have the board set out from the ~11. ~e s~ce back ~f the
board should not be closed in, except by grating or netting either
the sides, top or bottom, ae such an enclosure is almost sure to be
used, as a closet for clothing or for the storage of oil cans, rubbish,
etc. An open space is much ~re likely to be kept clean, and is more
convenient for ~king repairs, e~minations, etc. (d) Must be kept free
from moisture. (e) Uires must be in plain sight or ~eadily accessible.
Wires from a generator to switchboard ~y, ho~ver, be placed
~oncuit in the brick or cement pier on which the g~nerator stands, pro-
vided that p~per precautions are taken to' protect them against ~isture
and to thorou~ly ,insulate them from the pier.
used, no further protection will be required, but it should not be
allowed to rest upon. sharp edges ~ich: in time might cut into the lead
sheath, especially if the cables were liable to vib~tion. A smooth
run~y must be provided. Yf iron conduit ia provided, ~bber-sovered
wire ~11 be satisfactory for low ~tential systems.
gerber, as in dynamo rooms and on ~he back8 of switohboardi, creating
mass of infl~ble insulation; 'such'wires should be enclosed in asbestos
sleeving or other similar fire-proof protection.
Section 35. (a) A fused ent~nce switch must be installed on each
building so.ice in ~ readily accessible place not more than seven (7)
feet f~m the floor, and as near as practicable to 'the point '~ere the
~res enter 'the building. (b) A fused service switch must be installed
at each meter not more than seven (~) feet from the floor and arranged
to cut o~f the current, from all circuits and devices including the
meters, except t~t ~en app~ved sealable ~ervice s~tches are used
the meter ~y be on the line side of the service switch. (c) ~ree wire
entrance e~tches and se~ice switches ~y have a diconnecting st~p in
lieu of a switch blade in a grounded neural. (d) Ail knife switches
m~t be so mounted that gravity ~11 not tend to close them, unless
prevented b~ a spring or otherwise from being, closed by gravity. (e)
Ne ~in s~tch ~th capacity of less t~n thirty ~peres will be accepted .
(f) Single ~le switches must'never be used as entrance s~tches nor
placed in the neutral wire of a three-~re system, or in the grounded
~re of a t~-wire branch or tap circuit. ~ree-~y switches are con-
sidered as s~ngle pole s~tches. (g) Ail flush switches must be enclosed
in approved metal bo~s. (h) ~Snap switches, in connection ~th open
wiring, must be provided with approved sub-bases to keep ~res clear of
surfaced ~'red over. Switches us~ for controlling motors and other
devices, ~less ~unt~ on s~tchboa~s or panel-boa~s, ~ust ~ve ne e~
~ed live ~rt~ and be exte~ally ope~ted.
Section ~7. No ~in service feeders for any installation 8~11 be 8~ller
then No/ 10 ~.,amd S. gauge wires, and ~ere a total lead of more t~n
fear 1,000 ~tt circuits at 110 volts is to be connected to se~ice ~res
f~m other than iselat~ plants, three.re ~in feeders ~11 be required.
Section 38. (l~or rules governing ~noving picture machines, see Section
26) l~ote: Ail wiring, apparatus, etc., not specifically covered by
special rules herein given must conform t~ the requirements of the
other sections of this o~inance. Definition: ~n so far as these ~les
and requirements are concerned, the te~ ~theater~ s~ll mean a building
or ~rt of a building in ~ich it is designed to ~ke a presentation of
drastic, ope~tic, or other perfo~nces or sho~ for the entertai~ent
of spectators ~ich is capable of seating at least four hundred (~0)
persons, or ~ch has a stage for such perfo~ances that can be Used
for scenery and.other stage appliances.
S~TC~OA~S
(a) Stage switchboards must be of the dead front t~e and ~de of non-
combustible, non-Absorptive insulating ~terial and provided with a
hood over the top to prevent anything from falling on it. Di~er~
be dead ~an the controlling switch is open.
(b) Must be so wired that no set of l~ps requiring m~re than 1,~00
~tts sh~ll be dependent upon one cutout. (c) Must be ~red in appr~ve~
conduit or a~ored cable, each l~p receptacle to be enclosed within an
approved outlet box, or the l~p receptacles ~y be mounted in an iron
or steel box, metal to be of a thickness not less than No, 20 U.S. sheet.
meta~ gauge treated to prevent oxidation, so constructed as to enclose
all wires. Wires .to be soldered to lugs of receptacles. (d) Cable
for bo~ers ~ust be of approved type and suitably Supported;. conduit
construction must be used from switchboard to point ~ere cables must
be flexible to pe~it of the ~ising and lowering of border. (e) Must
be suspended with wire ropes of ~mple strength, and grounded.
STAGE POOKET~,[.
(f) Must be ~f approved type controlled from switchboard,, each receptacl,
to be of not less than fifty (50) emperez ~ting,. and each receptacle
to be ~red with a separate circuit to its full capacity.
'225
(g) ~ust b,e wired in approved .conduit of armored cable. All pend~.nt lights
must be equipped with approved re~nforced oord, a~ored cable, or steel
a~red fle~ble cord. (h) All lamps must be provided ~with approved ~rd8,
sealed ar locked in place.
(i). Arc l~ps used for stage effects must confo~ to the following re-
quiremente:. ~ust be const~cted entirely of metal not less than No. 20
U. S. ga~e, except ~ere the use of approved instating ~terial ia
necessa~,~ (j) ~ust be substantially constructed, and so designed
p~vide f~r peoper ventilation, and to prevent sparks being ~itted from
l~mps ~en s~e are in operatien, and mica must be used for f~e insulatio~
(k) Ail st~nded connections in l~p and at switch and rheostat must be
provid~ with approved lugs. (1) ~eostat, if ~unted cn standard, must
be rai~ed to a height of at least three (~) inches above floor line, ~nd in
addition to being properly enclos~ must be surrounded ~th a substantially
attached metal g~rd having a mesh not larger than one (1) square inch,
~tch~ ~rd is to be kept at least one (1) inch' from outside f~e of
rheostat. (~)~0ver eve~ exit from theaters there shall be pe~nently
lo,ted on the inside of such exit a sign bearing the ~rd '~xit' painted
or printed in easily legible, b01d faced letters not less than six
Snehes in height~ ~ediatly adjacent to each of these exit signs, and
promineDtly'displayed, on the inside off such exits, red lights shall
placed. (n) ~ergencY lights must not have more t~n one set of fuses
between same a~d the entrance fuses ~nd must be controlled by a switch
located in a readily accessible place near the ent~nce to the auditori~
Section 39. (a) Ot%colled transfo~ers must not be placed inside of
buildings ~thout special pe~ission from the ~ectrical Ynspector.
pe~itted in buildings, must be located as near ~s possible to the point
at ~ich.the priory wires enter the buil~ings. (b) Must be placed in an
enclosure c~nstruct~ of.not less than eight (8) inch tile, concrete or
26 brick walls; the enclosure to be kept securely locked, and access to the
same allowed onl.y to responsible~ parties. Provided,. however, that such
enclosures will not be required for transformers in ~entral stations
, and substations, ordinary auto-transformers or transformers designed to
operate without oil and in which neither the -primary nor the secondary
voltage exceeds 600 volts, or for oil-cooled transformers in which neither
the primary nor the secondary voltage exceeds 2%0 volts and which are
placed within fireproof surroundings and all conditions approved by the
~lectrical Inspector. (c) Must be permanently and effectually grounded
and the enclosure in which they are placed must be practicall, air-tight,
except that it must be thoroughly ventilated to the outside air, if
possible, through a chimney or flue. There should be at least six (6)
inches air space on all sides of the transformer.
Section 40. Approved metallic conduits, approved armored cables, or
approved metal mouldings shall be required for all light, heat and Power
wiring in show windows, elevator shafts, hospitals, asylums or insti-
tutions of any kind designed for the care or treatment of persons, apart-
ment buildings, hotels, theatres, moving picture theatres, scheols,
~actories, public buildings, assembly halls or public halls, office build-
ings, department stores, warehouses, mills, grain elevators, feed stores,
stables arranged to accommodate more than four animals~ public garages,
black-smith shops, and public automobile repair shops; ~rovicted, however,
that such use of the above mentioned materials shall not be such-as will
conflict with other provisions of this ordinance relative to the use of
. such materials. Provided, however, that for minor alterations, extensions
and repairs to existing systems, the Electrical Inspectors may in writing
permit deviations from the above requirements. Provided, further, that
concealed knob and tube wiring will be permitted in buildings which are
used exclusively as private dwellings and arranged for not more than two
separate families. For sizes not greater than 1~o/ 10 B. and S. gauge,
one more conductor than permitted by the following table may be installed
in the specified conduit prov. ided the conduit is not longer than 30 feet,
and has not more th~n the equivalent of two quarter bends f'rom outlet to
cutlet, the bends at the outlets not being counted: ·
TABLE X ?UO~Ti~ AND TI~FLE~W~R~
Size of Ninim~ Size o.f Conduit in
Co~du~to r Inches
B. and 8.
~uge .......
~. ~. -3. ~' %- ~: 7'. ~.'~
ooo 3
~0~00
~0000 3
,oooo
~oooo 3
~oooo ~ , ~ 6
~ooooo
oooo
~o~
g~oooo
8~oo
8~oooo
9ooooo
'1ooo~
1200000
,].25'oooo
3.3000o0
14.0,0000
~ ~ooooo
1600000
~gooooo
~oooo
zSooooo
xgooooo
2oooooo
6~ 6
6 6
6
6
6
(a) Conduits must be continuous from outlet to outlet. (b) Nust be
228
equipped at every outlet with an approved outlet box or plate, and must
be provided, at such outlets, with approved Bushings or nipples fastened
so as to protect the. wires from abrasion. Junction boxes must always
be installed in such manner'as to be accessible. (c) Ail elbows and
bends must be so made that the conduit'or lining of same will not be
injured. The radius or curve of the inner edge of any elbow not to be
less than thre~ and' one-half '(3~) 'incheS, and conduit ~ust not have more
than the equivalent of four (~) quarter bends from outlet to outlet, not
including the bends at the outlets. The conduit must be permanently and
effectively grounded, by means of approved grounding clamps or other
approved devices, tca suitable ground connection, as provided in Section
21 (c). (d) Wires must not be drawn in until all mechanical work on
the building has been, as far as possible, completed. Conductors in
vertical conduit risers must be supported within the conduit system in
accordance with the following table:
~o. 14 to 0 every 100 feet.
No. 00 to 0000 every 80 feet.
No. 0000 to 3%0,000 C.M. every 60 feet.
.Wo. 35o,ooo to 50o ooo c.M. every 50 feet.
500,000 C.M. to 750,000 C.M. every 40 feet.
Above 750,000 C.M. every 35 feet.
A turn of ninety (90) degrees in the conduit system will constitute a
satisfactory support as per above table. The following methods of
supporting cables are recommended: (1) Junction boxes may be inserted
in the conduit system at the required intervals, in which insulating
supports of approved type must be installed and secured in a satisfactory
manner so as to withstand the weight of the conductors attached thereto,
the boxes to be provided with proper' ~" covers. (2) Cables may be
supported in approved Junction boxes on two or more insulating supports so
placed that the conductors will be deflected at an angle of not less than
ninety (90) degrees, and carried a distance of not less than twice the
diameter of the cable from its vertical position. Cables so Suspended
may be additionally secured to these insulators by tie-wires. Other
methods, if used, -must be approved by the Electrical Inspectors.
. 229
(e) ~ust have the tw~ or ~re wires of a circuit drawn in the' same
conduit. (f) The same conduit mu~t never contain 'circuits of different
systems, but ~ay' contain two or ~o're circuits of the same system* ~e
~ree ~st l~ve th~ conduit thr~h app~ved bushings.
....
Section 4~. (a) Wires must have an a~roved rubbe~ insulatin~ covering
and be rigidly supported on nOn-combustible, non-aBso~tive insu~atore"
~ich $~amte the wires at least one (1) inch from the s~rfface wired
over. Shoed preferably be run singly on sepa~te timbers, or studdings,
and must be kept at least five (~) inches apart. Special atteht~on must
be given t~t the wires Be d~ tight, But no strain must be placed on
the Joints in ~res, or around the ends of tubes or on outlet tubing,
a~d a sufficient n~ber off ~ebs must be used at these ~ints to pre~ent
such strains. (b) ~uet be separated from contact ~th the ~lls, floor
timbers and ~rtitione through ~ich they ~y ~se By non-combustible,
non-absorptive insulat~ng tube~, such as glass or ~rcela~nJ ( See also
Section 11.) (c) ~igid supporting requires, under ordinary conditions,
~ere wiring along flat surface, supports at least every four and
(~) feet. ~f the ~res are XiabIe to be disturb~d, the distance between
supports should Be shortened. At distributing center, outlets or
s~t~es ~ere space is limited and the fi~e (~) inch separation cannot
be ~ln~ained, each wire must' be sepa~tely encased in a continuous
length off approved flexible tubing. ~iree passing through timbers at
the bottom'off plastered partitions must be p~tected by an additional
tub'e, extending at least four (~) inches above the timber. (d)'~en,
a concealed ~ob and tube system, it is impracticable t° Place the whole
off a circuit en non-c~mbustible supports off glass or porcelain, that
~rtion of 2he circuit ~ich cannot be so supgorted must be installed
~th approved metal conduit, or approved a~or~ cable (see Section 9),
except t~t iff the difference of potential between the wires is not
o~er three hundred (~00) volts, and if the ~res are not e~sed to
~isture, they ~.y ~e fish~ iff se~tely encased In app~ved flexible
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tubing, extending in continuous legnths from porcelain support to
porcelain support, from porcelain support to outlet, or from outlet to
outlet. (e) Must, at all outlets, except where conduits are used, be
protected by approved flexible insulating tubing, extending in contin-
uous lengths from the last porcelain knob to at least one (1) inch
beyond the outlet.
WIRING FOR ,,HI, GH POTENTIAL ,S¥STE~]~, 6.00 to .~.,000 MOLTS:_
Section 42. (Any circuit attached to any machine or combination of
machines which develops a difference of potential, between any two
wires, of over 600 volts and less than ~,000 volts, shall be consider-
ed as a high potential circuit and as coming under that class, unless
an approved transforming device is used which cuts the difference of
potential down to 600 volts or less) (a) The f, nstallation of elec-
trical apparatus operating at a potential in excess of six, hundred
(600) volts is seldom necessary and will only be approved when every
practical safeguard has been provided. Plans and specifications for
installing high tension systems within buildings must be submitted to
and approved by the Electrical Inspec.tor before any work is done on
such installations. (b) Moros must, when operatin at a potential in
excess of six hundred (600) volts, have no exposed live metal parts,
and have their base-frames permanently and effectively grounded.
(c) Installations for a potential between six hundred (600) and five
thousand (~000) volts must be wired with approved metal sheath cable
in approved unlined metal conduit firmly secured in place. The metal
sheath must be permanently and effectively grounded, as .provided in
Section 21-c, and the construction and installation of the conduit
must conform to the r~les for interior' conduits. (d) The insulations
of the several conductors for high potential motors, where leaving the
metal sheath at outlets, must be thoroughly protected from moisture
and mechanical injury, by means of a pothead or some equivalent method.
The conduit must be substantially bonded to the metal casing of all
fittings and apparatus connected to the inside high tension circuit.
(e) The main line service for high tension systems within the buildings
must be protected by main fuses and automatic switch. .~he circuit
breaker must be provided with both overload and no voltage realeas, and
must t~e so arranged that an overload in any one phase will operate to
disconnect all wires of the circuit. (f) Transformers must be perman-
ently and effectually grounded, and the enclosure in which they are
placed must be practically airtight, except that it must be thoroughly
ventilated to the outside air, if possible through a chimney or a flue.
There should be at least six (6) inches of air space on all sides of
the transformers. (g) Transformers must be placed in an enclosure,
'constructed ~ fire-resisting material; the enclosure to be used e~l$
for this purpose, and to be kept securely locked, and access to ,the
same allowed only to responsible parties. Provided, however, that high
tension switchboards and their accessories may also be located in this
encle. Sure, if approval of detail has first been ecured from the
Electrical ~nspector.
Section ~. (Any circuit attached to any machine or combination of
machines which develops a difference of potential, between any two
wires, of over 5,000 volts, shall be considered as an extra-high
p~tential circuit and as coming under that class, unless an approved
trasnforming device is used which cuts the difference of potential down
to ~,000 volts or less.)
(a) Such wires must not be brought into or over buildings except power
stations and substations. /~z~7~ ~ $/~ 3 ~ /% ~ ~
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