Question:

Distance that an arc can occur?

I have a piece of electrical equipment at a voltage potential of 277VAC to ground. Due to hardware problems I have an air gap of 3/8 from ground to 277VAC when it used to be one inch. Please advise if I am safe to leave it that way or should I add insulation.

Answer:

That is ok with respect to any possible arc. But there may be other reasons to add insulation. Safety for example. If it's easy to add the insulation, do it. .

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