final bid specs 09328.pdf - Freese and Nichols, Inc.

B. Combination starter doors shall be interlocked mechanically with the circuit breaker operator
mechanism to prevent unintentional opening of the door while the circuit breaker is in the
closed position. The circuit breaker operator mechanism shall be mounted on the stationary
part of the enclosure and not on the door of the enclosure. The circuit breaker operator mechanism
shall indicate "ON" and "OFF" with the door open or closed. The circuit breaker
shall be manually operated, resettable after trip from the operator mechanism handle. The
operating handle shall clearly indicate whether the circuit breaker is "ON" or "OFF", or
"TRIPPED". Means shall be provided to lock each operator mechanism handle in the "OFF"
position and to close the door. Means shall be provided for releasing the interlock for intentional
access to the interior at any time and intentional application of power, if desired, while
door is open. Padlocking arrangements shall permit locking the disconnect device "OFF" with
at least three padlocks with door closed or open.
C. The combination starter shall have a magnetic starter contactor. The magnetic starter contactor
shall be NEMA rated and NEMA 1 magnetic starter contactors shall be the minimum
size allowed. Magnetic starter contactors shall have renewable contacts and a renewable
coil which shall allow each to be replaced without replacing other parts of the magnetic starter
contactor. Magnetic starter contactors shall have a maximum pick up voltage of 71% of nominal
coil voltage and a maximum drop out voltage of 59% of nominal coil voltage.
D. Each magnetic starter shall have three (3) external manual reset thermal overload relays of
either the bimetallic type or the melting alloy type. Overload relays shall be either ambient
compensated or ambient insensitive. Overload relay heaters shall be Class 10 for submersible
pump motors and hermetically sealed motors and shall be Class 20 for all other motors.
Overload relay heaters shall be selected to produce an overload trip at no more than the following
percent of the motor nameplate full load current rating:
Motors with a marked service factor not
less than 1.15 125%
Motors with a marked temperature rise of
not over 40°C 125%
All other motors 115%
E. Overload relays shall be reset from outside the enclosure with an insulated bar or button.
Auxiliary contacts shall be furnished on the circuit breaker operating mechanism, the starter
contactor and on the overload sensing unit as shown on the plans.
F. Controls and lights shall be heavy duty oiltight construction. Devices installed in the combination
starter or on the door of the combination starter shall be completely factory wired with
connections to external devices brought to a terminal strip installed in the starter. No field
wiring shall be permitted except for connections to remote devices from the terminal strip. A
physical wiring diagram shall be provided on each enclosure door and shall be protected to
remain intact and legible for the service life of the equipment. Control devices shall be identified
as to type and manufacturer.
G. Control relays, timing relays, control transformers, control circuit fuse blocks, etc., shall be
grouped in the corresponding combination starter with control wiring kept as short as possible.
Ample space shall be allowed between devices so that each component is completely
accessible without removing any other device.
Enclosed Controllers 26 29 13 - 4
DRP09328