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Posted by Tom Horne on May 17, 2008, 4:27 pm
pipedown wrote:
>> Ran a three wire #12 AWG (Black, Red, White plus ground) from 20 amp
>> DP breaker to a duplex NEMA 230 volt 15 amp outlet above a garage work
>> bench, (concrete floor), then extended 115 volts (Black, White and
>> ground) from it to two regular duplex 115 volt 15 amp outlets also
>> mounted above bench. Purpose of the 230 is that we have a couple of
>> 230 volt tools. Purpose of the 115 v. outlets, regular tools and small
>> bench mounted grinder.
>>
>> Thinking best way to GFCI all those outlets would be to have a GFCI
>> breaker, BUT; with either of 115 duplex in use there will be unequal
>> currents in the two legs of the GFCI breaker. So it will trip????
>>
>> Is there such a thing as a standard North American 230 volt GFCI
>> outlet? And if so would it also protect any 115 outlets downstream of
>> it?
>>
>> Or GFCI the first outlet following the 230 volt so it protects both of
>> the 115 volt ones? The 230 volt outlet then being non GFCI protected.
>> Or blank it off?
>>
>> Same thing could occur with what here is called a 'split outlet' (can
>> double the capacity and/or allow two heavier appliances, especially
>> kitchens, plugged into both halves of same outlet) whereby the tab
>> between upper and lower halves of a duplex 115 volt outlet is removed
>> and opposite 115 volt legs wired to each half.
>>
>> BTW; As a separate topic; while we have several GFCI protected outside
>> outlets, if necessary to extend power outside from a non GFCI outlet
>> inside the house we used a GFCI duplex outlet that is of a type that
>> does not provided downstream protection to other outlets and mounted
>> it on end of a substantial extension.
>>
>> Comments welcome. TIA
>
>
> Simply put, you cannot have a GFCI breaker for a 3 wire cable where two
> seperate branches share the same neutral. The GFCI breaker requires
> independent wiring of the neutral for each branch circuit.
>
> The only way you can do it is with a GFCI receptacle in the first fixture on
> each branch after the neutral is split. You can do a split outlet, you just
> need to use two seperate neutrals and break the tabs off both sides of the
> receptacles not just the hot side.
>
> I don't really follow your GFCI the 230V first to get both115V logic but I
> think a 230V GFCI breaker would cost more than a 3 pack of 120V GFCI
> Receptacles. Easiest thing to do is put one in each required location and
> not worry about downstream wiring.
>
>
Simply put your wrong. 120/240 GFCI breakers are available and they
work just fine thank you.
--
Tom Horne
"This alternating current stuff is just a fad. It is much too dangerous
for general use." Thomas Alva Edison
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