600V Bus Rated MCC Used for 208V Not Configurable for 480V
600V Bus Rated MCC Used for 208V Not Configurable for 480V
(OP)
I am working on a project where a client has an MCC which shows a rating of 600V on the nameplate. The MCC is being used for 208V service right now, and the client wants to switch over to 480V service for the utilization equipment. The MCC is relatively new, and I would like to reuse it.
I am hearing that using this particular MCC for 480V service would void the UL listing. I am thinking that it must be the control wiring and transformers not being rated for 480V service, since the bus rating is posted as 600V. This seems strange, since the amount of money saved on the equipment would be relatively low in my opinion.
Does anyone have any ideas as to why this would be the case?
I am hearing that using this particular MCC for 480V service would void the UL listing. I am thinking that it must be the control wiring and transformers not being rated for 480V service, since the bus rating is posted as 600V. This seems strange, since the amount of money saved on the equipment would be relatively low in my opinion.
Does anyone have any ideas as to why this would be the case?






RE: 600V Bus Rated MCC Used for 208V Not Configurable for 480V
Pay attention to your fault current bracing of the MCC, because it must meet or exceed the available fault current in your new 480V system.
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