Multiple Combination Motor Starter in a Single Enclosure

[blaze1389]

Any reference for sizing the enclosure for heat generated by multiple starters?

 

[petersonra]

Any reference for sizing the enclosure for heat generated by multiple starters?

The manufacturer of the starter can tell you how much heat each coil will generate when energized. Add them up to find the total heat generated.

Plenty of thermal calculators out there that can tell you what the heat rise will be inside the enclosure.

I don't usually bother unless there are a lot of starters and even then I have yet to find a case where I needed even a fan.

It does help to put a stirring fan inside the enclosure though. This is a small fan that just moves the air around a little bit inside the cabinet.

 

[tom baker]

In my state our control panels are required to be UL508A, or equal, listed. The NEC does not apply to control panels, which is why you don't see a lot of specific answers here. You can purchase a copy of UL508A.
There is article on control panels, 409?, in the NEC, but in all my 20 years as a moderator I have never seen it mentioned, except just now!

 

[petersonra]

In my state our control panels are required to be UL508A, or equal, listed. The NEC does not apply to control panels, which is why you don't see a lot of specific answers here. You can purchase a copy of UL508A.
There is article on control panels, 409?, in the NEC, but in all my 20 years as a moderator I have never seen it mentioned, except just now!

It has been mentioned here many times.