The Saint Paul globe. (St. Paul, Minn.) 1896-1905, 1901-08-30

Two or more wires of circuit dra1,,n
in the same conduit. - W -
For Concealed eKnob and T,hen
Work."
q. Must have an approved insn,a+ine
covering. (See No. A. y 'iiie
T. Must be rigidly supported on non
cGmbustible, nonaabsorptive insulators.
inch from the surface wired over and
| must be kept at least ten inches 9naI-t
ana, when possible, should be run singly
| on separate timbers or studding.
Rigid supporting requires. under ordi-
| rary conditions, where wiring along fat
| surfaces, supports at least every fonr
and one-half feet. If the wires are ia
PIE 10 ne disturbed the distance between
| the supports should be shortened.
s. When, from the nature of the case.
| 1t is impossible to place concealed wiz
| ing on non-combustible insulating SUM-
| ports of glass or porcelain, an approved
| al mored cable, single or twin conductors
| (see No 49, may be used, if it is Installed
without joints between outlets, and the
cable armor properly enters all fittings
| ana is r1gfdly secured in place or, if the
wires are not exposed to moisture, they
may be finished on the loop system if
separately incased throughout in APP
| proved flexible tubing or conduits
For Fixture Work.
t. Must have an approved rubber in
| suiating covering (see No. Al. and shall
| not be less in size than No. IS B. & 8.
| u. Supply conductors and especially
| the spices to fixture wires. must be kept
| clear of the grounded part of gas pipes,
and where shelves are used, the latter
must be constructed in a manner afford
ing sufficient area to allow this require
ment.
V. Must, when fixtures are wired out
side, be 50 secured as not to be cut or
abraded by the pressure of the fasten-
! iEgs or motions of the fixtures.
| 23. Inferior Conduits-
"a. No conduit tube having an internal
diameter of less than five-eighths of an
| inch shall be used Gf conduit is lined
measurement to be inside the lining).
| b. Must be continuous from one juno
! ton box to another or to fixtures, and
| the conduit tube must properly enter all
| fittings
c. Must be first installed as complete
conduit system. without the conductors.
d.. Must be equipped at every outlet
| with an approved outlet box.
e. Metal conduits, where they enter
| iUr ction boxes and at all other outlets,
| ETC., must be fitted with a Gaping or
approved Insulating material, fitted so as
to protect wire from abrasion.
f. Must have the metal Of the conduit
| permanently and effectually grounded.
"a. Fixtures
a; Must, when supported from the gas
| piping of building, be insulated from
| the gas pipe system by means of APP
| proved Insulating jo nts (see No. So
placed as closely as possible to the cell
ing.
b. Must have all barrs or fins removed
before the conductors are drawn into the
! fixtures. 20
C. The tendency to condensation with
| In the pipes should be guarded against
| by cealing the upper ends OF the fix
| tLre.
| d. No combination fixture in which the
conductors are concealed in a space less
than nf an hot Ion
IL side pipe and the outside casing will be
| allowed .ft2
e. Must be tested for contacts be-
| Nv cen conductors and fixture for short
| circuits and for ground connections be.
fore it is connected to it's supply con-
| dL ctors. 49, g..
f.. Ceiling blocks for fixtures should be
/ made OF insulating ma terial; if not the
| wires in passing through the plate must
! be surrounded with non-combustibIe
non-absorptive insulating material, such
| as glass or porcelain.
25. Sockets
| a. In rooms where iniammable gases
| may exist the incandescent lamp and
| socket must be incEoSed in a VaDor tight
| globe and be supported on pipe hanger
wired with approved rubber-covered wire
| (see No. Al soldered directly to the cir
| cult.
| In damp or wet places, or over spe-
| cialIy infiammable stuff, water proof
! sockets must be used.
When water proof sockets are used
they should be hung by separate strand
ed rubber covered wires not smaller
than No. IA BE- s.. which should pref
! erably bestwisted together when the drop
! is over three feet. these wires should
| be soldered directly to the circuit wires,
but supported independently of them.
| 2G. Flexible Cord
a. Must have an approved insulation
| and covering (see No. 49,.
b. Must not be used as a support for
clusters.
c. Must not be used except for pend
ants, wiring of fixtures, and portable
lamps or motors.
d. Must not be used in show windows.
! e. Must be protected by insulated
| bushings where the cord enters the
| socket.
f. Must be so suspended that the en-
/ tire weight of the socket and lamp will
| be borne by knots under the bushfng i'm
| the socket, and above the point where
| the cord comes through the ceiling block
| or rosette, in order that the strain may
be taken from the joints and binding
screws. ~
27. Arc Lights on Low Potential
Circuits
a. Must have cut4eut. (See No. 15-a)
for each lamp or series of lamps
b. Must only be furnished with such
| resistances or regulators as are enclosed
lance being treated as sources of heat.
IncandeScent lamps must not be used
for resistance devices.
C. Must be supplied with globes and
protected with spark arresters and wire
netting around globe, as in the case Of
arc lights on high-potential circuits. (See
Nos. II and SD. 81
d. For one FIVE ampere lamp or
smaller, No. IA wire. or larger must be
used. For two five ampere arc lamps
on one circuit, No. II, or larger, must be
used. -e.
2S. Economy Coil
a Economy and compensation coils for
arc lights must be mounted on non-com-
bustible. non-absorptive insulating sup
ports, such as glass or porcelain, al
lowing an air space of at least one inch
between frame and supports, and in gen.
eral to be treated like sources of heat.
See. 255. High Potential Systems
300 to $500 Volts.
Any circuit attached to any machine,
or combination of machines. which de-
yelop difference of potential between
any two wires of over 300 volts and less
than $500 volts, shall be considered as
high potential circuit, and as coming
under that class unless an approved
Transforming device is used, which cuts
the difference of potential down to 300
volts or less.
20. Wires
a. Must have approved rubber insu-
latiug covering. (See No. 3S).
b. Must always be in plain sight, and
never encased, except where required by
the Electrical Inspector.
c. Must be rigidly supported on glass
or porcelain insulators, which raise the
wire at least one inch from the surface
wired over, and must be kept apart at
least four inches for voltages up to $50,
and at least eight inches for voltages
over $50.
Rigid supporting requires. under or