Circuit Breaker Positioning

[augie47]

Another member asked this:
"I just would like to know if MCCBs are allowed to be mounted upside down for ATS application?
Any standard references. Thanks."

My answer would be, that if the mounting vertical, the breakers' "up" position must be the "on" position.
Reference is 240.81

 

[DARUSA]

Another member asked this:
"I just would like to know if MCCBs are allowed to be mounted upside down for ATS application?
Any standard references. Thanks."

My answer would be, that if the mounting vertical, the breakers' "up" position must be the "on" position.
Reference is 240.81

I agree with you!!!
Horizontally no problem but up side down ,no way!!!

 

[charlie b]

Not quite sure I understand the installation in this question. I take MCCB to be "motor controlled circuit breaker." But I would ask if the ATS is a manufactured unit, or if it is to be put together in the field. If the former, then the NEC rules would not be relevant.