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 Post subject: Single Phase VFD's
PostPosted: Mon May 17, 2010 6:15 am 
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Joined: Mon Nov 10, 2008 1:08 pm
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Location: Cincinnat, OH
I have recently ran into quite a conundrum when thinking about safety and arc-flash. We have some pumpstations that have single phase power coming in from the utility but we are powering three phase motors from VFD's. The question is- does the three phase output from the VFD pose any risk of AF hazard? Then if it does how in the world do you model them?

I would love to hear peoples thoughts on the matter.


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PostPosted: Mon May 17, 2010 6:33 am 
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What kind of power level for the VFDs? Single phase 120V or 240V?
What's the connection to the utility (3 wires 120-240V)? What's your main overcurrent protective device?


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PostPosted: Mon May 17, 2010 6:52 am 
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I do not have any specifics. This is just hypothetical right now. I really did come across them but not for the purpose of a study. I guess assume the worst case in all of you questions. The ultimate function is to see if there are any occasions where this needs to be considered.


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