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Hubbell makes a 220v GFCI that can handle up to 30 amps call the Circuit Guard, it came to me while I was at work, standing in a pool of water about to turn on a the saw that we use for cutting granite, it's a 220 volt motor on a 20 amp breaker and right on the saw is a GFCI in a weather tight box, the whole set up is designed to be washed down and I've never had the GFCI trip but I have tripped the breaker by pushing the 18" blade to hard in to a slab of stone.
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