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From the switchboard (or centre of distri- sni>.
/ . , division of
1 risers ) S Risers
bution) < groups of risers > shall Le car,
ried to the following points: < Group > No. 1
to , < group >' No. 2 to -—, etc.
(riser ) Every conductor in each < group of risers ['
Group > No. 1 shall feed all lights (loca-
tion), i group > No. 2 shall feed, etc. ( feeder )
ui it, ( switchboard ) ,, 324 Location
From the j centre of distribution f the ^ >
t • \ i Feeders > •
I feeders [ sna^ De carried to and thence
upward in (channels, elevator shaft, etc., with location) to their respective junction boxes.
From the j jTM* I junction boxes mains
'' iu secondary
shall be carried to secondary junction boxes •i|)'0xeH',"i where all tap lines shall centre. From
| feeder [ 1 s^a^ De carried mains
terminating at ;from < fee(jer \ No. 2, etc.
126. Taps. (Note.—In certain cases it is advisable to run the circuits in such a manner that no room shall be dependent on one circuit only; if so desired, it should be added under this heading.)
From the < feeder >. junction boxes distrib( main )
uting circuits shall be run to the various outlets as specified in the schedule and located on the plans. For all taps duplex conductor requiring but one tube may be employed provided the current required does not exceed amperes.
12Vox£tiou termmals °f &U the | feg^fgpS i mains
and taps shall be brought together in junction boxes at the points designated in this specification and on the plans, [and connected with their respective cut-outs and switches; (unless the wiring contractor does not furnish cut-outs and switches, in which case add: in such a way as to permit the easy and convenient insertion of the cut-outs and switches specified.)].
(See p. 81, Sec. 95.) 129. Fuses.
(See p. 81, sec. 96.) 130, switches.
Where no gas pipes or other support for the lfu f j*rture fixture exists, the special form of terminal box designed to furnish such support shall be employed and shall be substantially fixed to a suitable foundation in the ceiling or wall.
All tubes shall be of sufficient size to allow 132. sizes of the wires to be readily drawn in, withdrawn and reinserted at wi.ll. A quarter-inch tube will be permitted only where space is extremely limited.
Tubes, whether concealed or on the sur- 133. cups, face, should be held in place by metal clips; the use of staples for such purpose will not be allowed where it can be avoided.
The tubes shall be cut squarely, reamed out 134. joiuts. smoothly, and the ends joined by the use of the coupling designed for that purpose.
Where more than four elbows are unavoid- L"f/itTM'°uS able an intersection box shall be inserted to relieve both the wires and the tubes of strain when the wires are being drawn in.
All tubes shall emerge at outlets in terminal boxes, leaving the outlets so protected as not to be injured by the plasterers.
Floor To guard against mechanical injury and the destructive action of cement, all floor conduits shall be made of double tube, one telescoped within the other, and both the outer and inner tubes joined in the usual manner. The outer tube shall, in the case of contact with cement, be alkali proof. As a further protection, floor tubes shall be covered during construction with a light board. Such other precautions shall be taken to insure the safety of the tubes as the character of the building and work require.
i?8. scptiia- Each side of circuits carrying more than
tiou of Wires. . i n i . . . ,
amperes shall be run in a separate tube.
Wires forming parts of two distinct circuits shall in no case be inclosed in the same tube.
139. Meter (See p. 82, sec. 98.)
Outlets. \ f > i
140. Elevator (See p. 82, sec. 99.)
Lights. \ f > i
141. Witious (gee p g3 sec 1Q1 .) lions.
142 iiistrac- (See p. 83, sec. 102.)
143. HonKin« (See p. 83, sec. 103.)
or Fixtures. v r''
Soko'fix- (See p. 84, sec. 104.)
Hires Alreiuly i iu Place.
us. suspension (See p. 84, sec. 105.)
ot Sockets and v r'' Lumps.
w^ sysTeu,. (See p. 85, sec. 10G.)
(See p. 85, sec. 107.) 1"7-lbTe"
\ r > i V ire System
Adnpteil to the Two Wire System.
Interior Wiring for Central Station Plants.
This specification contemplates the com- »»• J'j'JJ}^1. plete installation of ,' c. p., incandescent lamps located in blocks as designated on the plans hereto attached and made a part of this specification.
(See p. 75, sec. 79.) U9. fixtures.
(See p. 70, sec. 80.) 1B0. Lan'P8,
(See p. 7(>, sec. 81.) Ibi. sockets.
(Note.—Specify whether bids for two-wire 152 system, direct-current systems only, for three-wire direct-current, for two-wire alternating current, or for any system will be considered.)
The fall of potential between the service iss. varintion
1 in Pressing.
cut-out and the most distant lamp in any building shall not exceed —— per cent.
All wires used inside of buildings shall be 154't["Is,ula insulated with .
f open cleat)
All wiring shall be ^molding [ work, iss. cimraeter
(concealed ) or the work.
neat in its mechanical appearance and arrangement.