I have an MCC bucket with a 100A breaker & size 3 starter. I have a temporary piece of equipment with MOCP of 80A. Would like to use the existing bucket. Can I size the conductor from MCC to fused disconnect to the equipment MCA with a fused disconnect & 80A fuses located at equipment? Or do I need 100A cable from MCC to fused disc?
Motor protection/wire size
- Thread starter bcbeaver
- Start date
- Location
- Illinois
- Occupation
- retired electrician
First is the OCPD in the MCC bucket an actual breaker? Many are motor circuit protectors and you can't use them for supplying other loads.
If it is a breaker, you will have to use 100 amp conductors unless you can use one of the tap rules in 240.21(B). The tap rules may permit the use of 80 amp wire from the breaker to the fused disconnect.
If it is a breaker, you will have to use 100 amp conductors unless you can use one of the tap rules in 240.21(B). The tap rules may permit the use of 80 amp wire from the breaker to the fused disconnect.