Presence Indicators and Response Switches

contacts, and voltages shall be as indicated on the control diagrams.

2.9.18.7

Provide at hoppers and conveyor discharges located and protected according

to manufacturer's recommendations to ensure safe and reliable operation.

Mount presence indicators in such a manner that they will not be injured by

occasional large lumps nor falsely operated by stray lumps or collected

amounts of coal.

2.9.19

Control Panel and Controls

Provide a semi-automatic control system for the coal handling system as

indicated. Control panel NEMA 12 construction, centrally located in the

main plant control room. Panel front shall include a system graphic

display as indicated. Display shall be approximately to scale and painted

with an industrial acrylic enamel. Outline items with 3 mm 1/8 inch wide

black lines. Lettering shall be on engraved plastic screwed to the front

of the panel, with white letters on a black background. Provide controls

for operation on [_____] volt, [_____] phase, 60 Hz a.c. Panel shall be

complete with an annunciator and interlocks, relays, switches, running and

safety lights, and auxiliary parts necessary to safely control and operate

the system. Items located in the door shall be dust-tight and oil tight

with push-to-test indicating lights being of the transformer type. Control

relays shall be 10 amp, 600 volt class with convertible contacts. Provide

and mark terminals for connections with the exception of the neutral.

Panel shall contain [_____] percent spare terminals. Wiring shall be No.

14 AWG type THHN stranded. Neutral wire shall be white and other wiring of

120 volts or less shall be color coded and labeled.

Provide a plastic

wire duct of sufficient size to provide [_____] percent cross sectional

spare. Wiring shall be in accordance with requirements of NFPA 70.

2.9.19.1

Panel Devices

Control panel shall include the following indicating lights (color in

parenthesis):

a.

Power - ON

(red)

b. System Run (3 required)

Rail unloading hopper to storage yard

(green)

Reclaim hopper to boiler plant

(green)

Bunker to boiler plant

(green)

c.

Rail unloading hopper surfactant sprays - ON

(green)

d.

Reclaim hopper surfactant sprays - ON

(green)

e.

Stackout tube belt conveyor -

ON

(green)

f.

Reclaim belt feeder - ON

(green)

g.

Bunker rotary vane feeder - ON

(green)

h.

Bunker reclaim belt feeder - ON

(green)

i.

Bucket elevator - ON

(green)

j.

Bunker - HIGH LEVEL

(green)

SECTION 15502N

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