4
FIG. 2.6 CRADLE WIRING
2.5 POWER TERMINAL CONNECTIONS
THE
H-3 POWER TERMINALS ARE PLATED FOR MAXIMUM JOINT
EFFICIENCY AND CABLE OR BUS CONNECTORS MUST BE CLEAN AND
FREE FROM DENTS OR BURRS, AND BOLTED SECURELY TO THE
TERMINALS. POOR JOINTS LEAD TO OVERHEATING, SUBSEOUENT
CONTACT DETERIORATION, AND AN EVENTUAL FAILURE.
CONNECTIONS SHOULD BE PROPERLY SUPPORTED SO AS NOT TO
TRANSFER ANY UNNECESSARY MECHANICAL OR SHORT CIRCUIT
STRESSES TO THE TERMINALS. ANY
STRAIN WHICH MAY HAVE NO APPARENT EFFECT INITIALLY MAY
AFTER PROLONGED PERIODS OF VIBRATION AND SHOCK FROM
NORMAL OPERATION, CAUSE POOR CONTACT ALIGNMENT.
2.6 SECONDARY CONTROL CIRCUITS
CONTROL CIRCUIT WIRING, WHERE APPLICABLE, SHOULD BE
MADE IN STRICT ACCORDANCE WITH DETAILED WIRING DIAGRAMS.
FIXED MOUNTED BREAKERS ARE PROVIDED WITH TERMINAL BLOCKS
FOR CONNECTIONS TO REMOTELY LOCATED CONTROL AND
INDICATING DEVICES. REMOTE WIRING SHOULD BE BUNDLED
TOGETHER, PROPERLY SUPPORTED AWAY FROM PRIMARY
CONNECTIONS.
CONTROL WIRING FROM CRADLE MOUNTED SECONDARY
CONTACTS OF DRAWOUT TYPE BREAKERS MUST BE PASSED THROUGH
THE HOLES PROVIDED IN THE CRADLE BACKPAN AND SECURED ON
THE INSIDE IN SUCH A MANNER THAT IT IS KEPT AWAY FROM THE
PATH OF THE BREAKER MAIN DRAWOUT CONTACTS AND SHUTTERS IF
PROVIDED.
METER SHUNTS, RESISTORS AND SIMILAR DEVICES THAT
OPERATE AT RELATIVELY HIGH TEMPERATURE SHOULD BE MOUNTED
AWAY FROM THE CIRCUIT BREAKER SO THEY DO NOT CONTRIBUTE
TO THE HEATING OF THE UNIT.
