So, it's good idea to have outdoor type MCC beside the equipments despite of excessive heat !You can put an MCC inside an enclosure or room located on the roof that can be air conditioned.
There are lots of options. I am personally a fan of getting the drives as close to the motors served as practical. It simplifies troubleshooting and installation.
So, it's good idea to have outdoor type MCC beside the equipments despite of excessive heat !
I've been in a fair number of penthouses that are over 40 degrees C now and then. Many are not air conditioned.MCCs and VFDs are ALL designed around a maximum 40C (104F) ambient temperature. In some cases there are VFDs that can be de-rated for higher ambient, but that is never the case with an MCC. 40C is the design limit for MCCs in their UL listing procedure. So even with a 3R enclosure, if you put it outdoors on a rooftop anywhere that the air might get over 40C (which from my experience is ANY rooftop), you must add an A/C unit to it anyway, so if you can put in indoors, that's better all around.
No argument, me too. Doesn't mean it's kosher though. In fact every time I point that out to a consultant who says that an MCC must be rated for 50C (sometimes more), they are shocked to learn that UL/NEMA specs state 40C max. Back in th days before power electronics migrated into MCCs, people didn't pay much attention because it didn't really affect contactors and such, although it does technically affect breaker tripping curves.I've been in a fair number of penthouses that are over 40 degrees C now and then. Many are not air conditioned.