2.11.4 Timing Functions – All control panel timing functions shall be
accomplished by metal encased, solid-state, plug-in timing relays
with 2PDT output contacts rated for ten (10) amperes. All solid-
state time delay relays shall be reverse polarity protected and shall
not function or be damaged by the application of improper polarity.
Open printed circuit board type time delay circuits will not be
accepted.
2.11.5 Control Relays – All control relays shall be the 3PDT plug-in type
with .187QC blade terminals rated for (10) amperes. Each relay
shall be equipped with a manual push to operate check button,
L.E.D. or neon visual indicator, and see-thru dust cover for contact
inspection and protection. Exposed contact and octal base plug-in
relays are not acceptable.
2.11.6 Relay Sockets – All relay sockets shall be of thermoded
termoplastic type, suitable for snap mounting on standard D.I.N.
rail. Relay sockets will have wire clamp type terminals for secure
wire connections, and one, 1) piece bus bar connectors between
the actual relay blade and wire clamp terminal. Relay sockets shall
be rated for fifteen (15) amperes at 300V. Printed circuit board type
relay sockets and relay sockets with push-on quick connect
terminals are not acceptable.
2.12 AUTOMATIC LOAD TRANSFER SWITCH
2.12.1 The ATS shall be a NEMA 1 construction installed inside a NEMA
3R stainless steel vented enclosure. The rating of the automatic
load transfer switch (ATS) shall be specified by the project
engineer.
2.12.2 The automatic transfer switch shall be mechanically held on both
the emergency and the normal side, and rated for continuous
outdoor duty in the above described enclosure. The switch shall be
solid-state, electronically controlled, double throw with the main
contact rigidly and mechanically interlocked to ensure positive
switches. A manual operator must be provided to enable one (1)
hand manual operation, which, when utilized, can provide a neutral
position for servicing operations.
2.12.3 The automatic transfer switch shall be a single motor operated
circuit breaker type with interpole barriers and arc chutes. So-
called linear actuated or solenoid operated switches are approved
only when manufactured by the Generator MANUFACTURER. All
elements of the drive system must be replaceable from the front of
the switch, and the power switching devices must be replaceable
without removal of the connecting cables.
DIESEL ENGINE DRIVEN GENERATOR WITH WEATHERPROOF ENCLOSURE 472-21
(23 pages)
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