indication is required.
**************************************************************************
Wire the start pushbuttons to function only when the three position
selector switch is in the "LOCAL-MANUAL" or "LOCAL-AUTO" positions. In
addition to shutting down the T-R, the stop pushbutton shall clear all
alarm outputs, except the output indicating that T-R control is not remote.
Startup, whether by local pushbutton or remote control, shall arm the alarm
system. Provide remote control so that all T-R sets which have their
three-position selector switches in the "REMOTE-AUTO" position may be
stopped by pushbutton station on the main control panel. Provide output
contacts for remote indication of the status of T-R which are in the
"REMOTE-AUTO" mode. Provide indicating lights for each precipitator on the
auxiliary boiler control panel as follows:
a.
Green -- all units off.
b.
Red -- all units on.
**************************************************************************
NOTE: Require amber light if sequential startup is
required.
**************************************************************************
c.
Amber - startup in progress.
2.3.4.4
Redundant Protective Devices
Provide redundant protective devices on controller connections to the
transformer unit secondary circuit.
2.3.5
High Voltage System Wiring and Support Insulators
**************************************************************************
NOTE: Use this paragraph for "bus-duct" wiring.
**************************************************************************
Provide wiring materials and insulators, including insulators for discharge
electrode supports, required to electrically connect the T-R to the
discharge electrodes. The high voltage lead from the rectifier to the
discharge electrodes shall consist of a conductor in metal enclosed
weatherproof bus duct. Furnish the bus duct complete with necessary
insulators, duct supports and fittings, and supply formed to exact length
ready for bolting to the equipment.
2.3.6
High-Voltage Leads
**************************************************************************
NOTE: Use this paragraph for "pipe" wiring.
**************************************************************************
Completely enclose high voltage leads to the precipitator in a grounded 16
gage minimum thickness sheet metal guard. The conductor shall be 20 mm 3/4
inch diameter, Schedule 40 iron pipe. Include equipment for the
introduction of clean purging air in and around the support bushings to
prevent dust buildup on the insulators. The high voltage conductor pipe
shall have a union immediately connected to the T-R set so the T-R can be
easily isolated from the precipitator. Connect the conductor pipe to the
high voltage electrode frame by a removable wire lead.
SECTION 15862N
Page 29
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