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shall be provided for the installation one ground detector, or if the circuits have no common junction one ground detector for each circuit which shall continuously indicate the insulation from the ground maintained on both sides throughout the system, and one pair of lightning arresters for the common circuits, or for each circuit if they are kept separate; there shall also be provided such brush jigs, switches, out-outs, belts and other appliances as are requisite and proper for the operation of the system; all switches and cut-outs to be of the double pole type and mounted on incombustible bases.

For alternating systems there shall be 37 - convert

ors«

provided the following numbers and sizes of converters:

[blocks in formation]

This contractor shall carry to the

switchboard location at all regulator,

exciter, auxiliary, and main wires, leaving the ends coiled up neatly, properly tagged and sufficiently long to make the necessary switchboard connections. All main wires shall have a capacity of at

least C. M. per ampere, and no wire

smaller than B. & S. or B. W. G.

shall be used. All regulator, exciter, and

for systems carrying over volts all

auxiliary and main wires, shall be insulated with ;all wires of systems carrying over volts shall be run;

where of opposite polarity shall be separated at least ;and where crossing each other, wires of other circuits or passing near metal pipes, girders, etc., shall be further protected by .

For systems carrying less than

volts the main wires shall be of

j bare copper wire supported ( on porcelain insulators.

I carefully cleated to

the ceiling,
carried on porcelain
insulators,
A • concealed in a
- insulated wire -j moulding consist-

ing of a backing

thick and a

capping thick,

i run in conduit, wires of opposite polarity being separated not less than .

In no case shall insulated wires be carried in such proximity to heated surfaces, vapors or air as to endanger their insulation.

(Seep. 51, sec. 25.) SLWSS.

struction.

(Seep. 51, sec. 26.) %artn8ewal

(See Note: p. 52, sec. 27.) ei. summary.

Each bidder shall fill out completely, so far as it pertains to his apparatus, the following summary:

Number of direct-current dynamos

Trade number or designation . .

Number of alternating-current

dynamos

Trade number or designation . .

Number of exciter dynamos . .

Trade number or designation . .

Rating of dynamos in volts . .

Rating of dynamos in amperes .

Rating of exciters in volts . . .

Rating of exciters in amperes . .

Self or separately excited . . .

Shunt or compound

Reduction recomm ended in convert-
ers

H. P. required to be delivered at pulley
at full load

62 boawrd.oh" (See P- 53> sec 28.)

board AMora- There shall be placed upon this switchnektons "board, in addition to all the dynamo regulating apparatus, such switches, cut-outs and other appliances as are necessary for the proper and convenient manipulation of the circuits, such appliances to be named by each bidder in his proposal.

For the two-wire, direct-current system the appliances and connections shall be such as will permit any dynamo to be added to or taken from parallel circuit without in any manner affecting the operation of the dynamos remaining in circuit, or the candle-power and steadiness of the lamps.

For the three-wire, direct-current system the appliances and connections shall be such as will permit any dynamo on either side to be added to or taken from parallel circuit without in any manner affecting the operation of the dynamos remaining in circuit on that side, or the candle-power and steadiness of the lamps; and a breakdown switch for connecting the two outside wires in case it shall be ■ come necessary or desirable to operate on the two-wire system.

For the alternating-current system the appliances and connections shall be such as will permit the operation of any dynamo on any circuit or number of circuits, and the cutting in or out of any dy

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