Mca

[wirebender]

The A/C units were changed from under 100A (don't remember exact #) MCA to
103 MCA.

Therefore, I have 3 100A 3 pole discos that can't be used, or can they?
Is there any way I can use a disco rated 100A in a circuit that must have a minimum circuit ampacity of 103A? MOCP is 110A.

If I can't use them, what are some options other than 200A disco?
125A circuit breaker enclosure?
Anything else?

FWIW units are 480 3 phase RTUs.

 

[infinity]

I would use either a 200 amp disconnect with 110 amp fuses if the unit lists the MOCPD to allows fuses or a 110 amp CB if the unit allows CB protection. Either way you can't use the 100 amp stuff you already have.