72. Globes. 73. Spark Arresters and Nets. 74. Carbons. 75. Starting Plant and Instruction. 76. Renewal Parts. 77. Summary. clear glass full ground half ground globes. colored, etc. wire-gauze spark arresters, and wire globe-nets. sets of carbons, a set consisting of one upper and one lower carbon. (See p. 46, sec. 25.) (See p. 47, sec. 26.) (See Note: p. 47, sec. 27.) Each bidder shall fill out completely the Series or shunt wound H. P. required to be delivered at pulley 78. Switchboard Com plete. SWITCHBOARD, APPARATUS, AND CONNECTIONS. This contractor shall furnish and erect the following apparatus and material: One combination (material) switchboard with a capacity for circuits, and provided with the necessary sockets, plugs, main and transfer cables, testing connections, and a suitable and convenient device for holding cables not in use. It shall be so arranged and marked that any circuit or series of circuits may be quickly connected with or disconnected from any dynamo with the least possible danger of short-circuits or error. Sockets shall be so designed that it is practically impossible to short-circuit, ground, or receive a shock from them. All connections with the dynamo leads shall be easily accessible. All wires used in making connections shall have insulation. All plugs shall have well insulated wooden handles, and the cables shall be covered with soft-rubber tubing or equivalent as an extra precaution. All cables shall be of stranded wire. All joints shall be soldered. All connections to switches, cut-outs, etc., shall be soldered or made with an approved form of lug or setscrew, in all cases care being taken to secure good and sufficient contact to prevent heating and insure permanency; when made with lugs or set-screws they shall be in plain sight and easily accessible for tightening. Connecting wires shall be so run and secured that crosses or grounds are impossible in the normal operation of the plant. FIXTURES, ETC. (Note. No set specification can be made for 79. Fixtures fixtures and shades; their character must be and Shades. 80. Lamps. determined wholly from individual require- This contractor shall furnish and deliver at 81. Sockets and Receptacles. stating, also, their make and the make of the Lamps shall be guaranteed to have an aver- This contractor shall furnish and deliver at ་ The building shall be wired to lets, switch outlets, (and lets) for the equivalent of -c. P., (to outlets volt lamps. The wiring shall be All wiring shall be for the parallel, two-wire 84. System. system of distribution. in Pressure. The fall of potential between the switch- 85. Variation board (centre of distribution) and the (farthest lamp) shall not exceed at load per cent. of the initial pressure; this difference to be divided as follows: risers) feeders per cent., mains per cent., taps per cent. All wire used throughout the installation shall be insulated with 86. Insula. tion. Each S riser, Fester, main, and tap shall test out with an insulation resistance of at least ohms. The entire installation shall test out with an insulation resistance of at least ohms divided by the sum of the number S risers, of separate {feeders,} mains, and taps. From the switchboard (or centre of distri groups of risers, shall be car 89. Location of ( Risers risers, bution) feeders, Group No. 1 shall feed all lights (location), Feeder riser group No. 2 shall feed, etc. feeder From the switchboard (or centre of dis Feeders } ward in (channels, wooden conduits, elevator shaft, air shaft, etc., with location) to their respective cut-out boxes. |