If a Fan coil unit has a nameplate of 15 amp max fuse can the breaker be this or is an actual 15 amp fuse protection required? The breakers would be HVACR rated. They have a local disconnect but not fused and we don't want to change anything. The nameplate says max fuse not "OCPD", samething or not?
Fan Coil Fusing
- Thread starter Canton
- Start date
- Status
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Not.
Care to elaborate a little? Trying to see what options we have, any code references you could provide.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Sure. If the nameplate says maximum fuse size, that instruction from the manufacturer requires that you use a fuse rather than a circuit breaker.
There is nothing directly in the NEC as to whether to use a fuse or some other OCPD type.
If you can get a statement in writing from the equipment manufacturer that the nameplate was overly restrictive and that a CB would be OK, then I would hope that an inspector would accept that. But....
For many reasons, including reducing the chances of damage caused by single phasing, most of us would prefer to see a CB used in the absence of other specific circumstances (such as the need for a current limiting fuse type.)
Thanks, I was having trouble finding a code reference.....there is nothing directly related. I did check with the Manufacture and they pretty much said the same thing. I appreciate the info.
- Status