Questions On The Code > Construction Specifics

GFCI on 240 Volt Circuit? (USA)

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Vince:
Go for Siemens breakers, they are exactly the same. I think GE are also similar.

As I said, it's probably not code compliant on paper, but as long as both breakers operate at the same time, there will be no risk.

To my knowledge, if the outlet isn't closer than a certain distance from a wet location, no need to install one. That distance is 1,5m (~5 ft) in Canada, not sure for US.

Jace the Gull:
For the USA...all garages, unfinished rooms, bathrooms and kitchen counter outlets MUST be GFCI....

I will look up to my NEC Code 2008 book and get back to you alright....

Antstar85:
It Depends, Single outlets lets say for a big compressor or Dryer on its own breaker with absolutly nothing else on the circuit and not for general purpose use dont have to be. But if your going to be using it for experiments, I would install a GFCI breaker. They run you about $80 at a supply house as there are no 240 volt GFI outlets to my Knlowledge.

Mike:

--- Quote from: Jace the Gull on August 28, 2011, 08:21:32 PM ---For the USA...all garages, unfinished rooms, bathrooms and kitchen counter outlets MUST be GFCI....

I will look up to my NEC Code 2008 book and get back to you alright....



--- End quote ---

My garage, kitchen, and unfinished parts of my basement don't use GFCIs. The kichen outlet nearest the slider door does and the bathrooms do and so does outside, but other than that all the outlets in my house are standard.

Nelson:
I just thought of a potential problem with tying two single-pole GFCI breakers together. GFCIs work by measuring the difference in current flow between the hot and neutral wires. If I tie two single-pole GFCI breakers together and connect a 240-volt load, current will flow between the hot wires, not between hot and ground. That will cause the GFCI(s) to trip. I learned that one time when I tried to install a GFCI outlet on a three-wire circuit! The hot wire current does not always equal the neutral wire current on a three-wire circuit or on a 240 volt circuit.

So, if I did install a GFCI, it would have to be a specially designed device for 240 volt circuits like the one Joe mentioned.

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