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220 volt 3-wire vs. 4-wire

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220 volt 3-wire vs. 4-wire M.Burns 05-11-2008
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Posted by M.Burns on May 11, 2008, 10:03 am
I have a 220-volt electric dryer with 3-prong plug going into a 3-prong
receptaclet (2 blades on a 'V', and third L-shaped prong).
Do newer electric dryers have a 4-wire plug with a ground?
Would I have to replace the 20-year-old 3-prong receptacle?
Just technically speaking, could the ground prong on the male plug be cut
off to fit the old outlet (similar to what people of done for years on
110-volt stuff). Or is the wiring for 4-wire 220 volt completely different
because of 2 hot wires, neutral, ground, etc.?



Posted by RBM on May 11, 2008, 10:19 am

>I have a 220-volt electric dryer with 3-prong plug going into a 3-prong
>receptaclet (2 blades on a 'V', and third L-shaped prong).
> Do newer electric dryers have a 4-wire plug with a ground?
> Would I have to replace the 20-year-old 3-prong receptacle?
> Just technically speaking, could the ground prong on the male plug be cut
> off to fit the old outlet (similar to what people of done for years on
> 110-volt stuff). Or is the wiring for 4-wire 220 volt completely
> different because of 2 hot wires, neutral, ground, etc.?

The NEC allows you to use an existing three wire electric dryer feed and
receptacle. Typically, dryers don't come with cord sets, so you specify the
one you need for your outlet. Any new installations require a four wire
feeder and receptacle. If, you do have a four wire feeder, it would be
sensible to install a four wire outlet on it, then get the appropriate cord
set with the new dryer
>
>



Posted by S. Barker on May 11, 2008, 10:53 am
Dryers don't come with cords. Just use your old cord on the new dryer and
go. You'll have to be sure the grounding jumper is in place on the new
dryer like it is on your old one.

s


>I have a 220-volt electric dryer with 3-prong plug going into a 3-prong
>receptaclet (2 blades on a 'V', and third L-shaped prong).
> Do newer electric dryers have a 4-wire plug with a ground?
> Would I have to replace the 20-year-old 3-prong receptacle?
> Just technically speaking, could the ground prong on the male plug be cut
> off to fit the old outlet (similar to what people of done for years on
> 110-volt stuff). Or is the wiring for 4-wire 220 volt completely
> different because of 2 hot wires, neutral, ground, etc.?
>



Posted by EXT on May 11, 2008, 12:08 pm
Canadians reading this should note differences that in Canada, dryers and
non-built in stoves have all come with 4 prong cords for the past 35 years.
Code requires receptacles that are fed by what is labeled a "3 wire plus
ground" cable. It is not Code compliant to connect the neutral and ground
together in the appliance.

> Dryers don't come with cords. Just use your old cord on the new dryer and
> go. You'll have to be sure the grounding jumper is in place on the new
> dryer like it is on your old one.
>
> s
>
>
>>I have a 220-volt electric dryer with 3-prong plug going into a 3-prong
>>receptaclet (2 blades on a 'V', and third L-shaped prong).
>> Do newer electric dryers have a 4-wire plug with a ground?
>> Would I have to replace the 20-year-old 3-prong receptacle?
>> Just technically speaking, could the ground prong on the male plug be cut
>> off to fit the old outlet (similar to what people of done for years on
>> 110-volt stuff). Or is the wiring for 4-wire 220 volt completely
>> different because of 2 hot wires, neutral, ground, etc.?
>>
>
>


Posted by hallerb@aol.com on May 11, 2008, 12:18 pm
> Canadians reading this should note differences that in Canada, dryers and
> non-built in stoves have all come with 4 prong cords for the past 35 years=
.
> Code requires receptacles that are fed by what is labeled a "3 wire plus
> ground" cable. It is not Code compliant to connect the neutral and ground
> together in the appliance.
>
>
>
>
>
> > Dryers don't come with cords. =EF=BF=BDJust use your old cord on the new=
dryer and
> > go. =EF=BF=BDYou'll have to be sure the grounding jumper is in place on =
the new
> > dryer like it is on your old one.
>
> > s
>
> >>I have a 220-volt electric dryer with 3-prong plug going into a 3-prong
> >>receptaclet (2 blades on a 'V', and third L-shaped prong).
> >> Do newer electric dryers have a 4-wire plug with a ground?
> >> Would I have to replace the 20-year-old 3-prong receptacle?
> >> Just technically speaking, could the ground prong on the male plug be c=
ut
> >> off to fit the old outlet (similar to what people of done for years on
> >> 110-volt stuff). Or is the wiring for 4-wire 220 volt =EF=BF=BDcomplete=
ly
> >> different because of 2 hot wires, neutral, ground, etc.?- Hide quoted t=
ext -
>
> - Show quoted text -

I will add that i think 3 wire is a bad idea, with a bad day it could
be a real hazard....

buy a new dryer? then get a new cord and updated outlet

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