480 voltage 1

[Santaman7]

what is the min. air gap size needed to prevent 480 volt AC from arcing?

 

[jraef]

Where? In clean air, dirty air, a vacuum? Phase-to-phase, phase to ground? Are you building switchgear? The specification for 480V switchgear (which implies North America) is ANSI C37, I suggest you invest in a copy if that is your job function.


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[Santaman7]

This is for a heater bank in a vacuum oven that is going through a pass through. I am talking about phase to ground and I would also like to know about phase to phase. Does ANSI C37 talk about air gaps?

 

[Eltron]

Do a Google search for breakdown potential of air or dielectric breakdown. You should be able to find enough info to calculate your gap requirements.

Dan

http://www.eltronresearch.com

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