What ambient conditions are acceptable for operation and storage of the Masterpact NT and NW circuit breakers?
What considerations must be made for ambient temperature, humidity, altitude, and vibration when storing or operating Masterpact NW and NT circuit breakers?
Masterpact NW and Masterpact NT circuit breakers
Resolution: Masterpact circuit breakers are suited for use:
At ambient temperatures between -13°F (-25°C) and 158°F (70°C). Operating the breaker above 104F (40C) may require derating or overbussing the circuit breaker. See attachment for details.
At altitudes less than or equal to 13,000ft. (3900 meters). At altitudes < 6600 ft. (2000 m), rerating factors apply. See attachment for details.
It is recommended that the equipment be cooled or heated to the proper operating temperature and kept free of excessive vibration and dust, and be protected from water intrusion and condensation.
See attachment for vibration, humidity, and storage recommendations.