These
conductors are installed in vitrified clay ducts. From dynamo switches
to bus bars and from bus bars to group and feeder switches, vulcanized
rubber insulation containing 30 per cent. pure Para rubber is
employed. The thickness of insulating wall is 9/32 of an inch and the
conductors are supported upon porcelain insulators.
[Sidenote: _Conduit
System for
Distribution_]
From the power house to the subway at 58th Street and Broadway two
lines of conduit, each comprising thirty-two ducts, have been
constructed. These conduits are located on opposite sides of the
street. The arrangement of ducts is 8 x 4, as shown in the section on
page 96.
[Illustration: EXTERIOR OF SUB-STATION NO. 11]
The location and arrangement of ducts along the line of the subway are
illustrated in photographs on pages 98 and 99, which show
respectively a section of ducts on one side of the subway, between
passenger stations, and a section of ducts and one side of the subway,
beneath the platform of a passenger station. From City Hall to 96th
Street (except through the Park Avenue Tunnel) sixty-four ducts are
provided on each side of the subway. North of 96th Street sixty-four
ducts are provided for the West-side lines and an equal number for the
East-side lines. Between passenger stations these ducts help to form
the side walls of the subway, and are arranged thirty-two ducts high
and two ducts wide. Beneath the platform of passenger stations the
arrangement is somewhat varied because of local obstructions, such as
pipes, sewers, etc.
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