Is it code compliant to use a UL98 rated 3 phase fused disconnect if the customer is only using 2 of the 3 phases? I have a 460V 3 phase supply, but am only using 2 phases. My powerpack is remote, and will be powered by all 3 phases. The local machine however will only need a heater and it's control transformer powered. I can achieve this with just 2 phases of the customer's supply.
The customer has 3 phase power, if it were not for the remote power pack I would have to supply them with a 3 phase fused disconnect. I do not see a problem supplying a 3 phase disconnect and only fuse 2 poles and leave the 3rd unused pole without a fuse. Would there be any code violation with this?
The customer has 3 phase power, if it were not for the remote power pack I would have to supply them with a 3 phase fused disconnect. I do not see a problem supplying a 3 phase disconnect and only fuse 2 poles and leave the 3rd unused pole without a fuse. Would there be any code violation with this?
Last edited: