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mpinneau

11:25AM | 04/28/10
Member Since: 04/27/10
2 lifetime posts
Bvelectrical
I don't understand the wires in our 220 supply. There are two covered with black rubber -- they must be hot-- and a bunch of about 8 or 10 bare silver colored wires.

The plug on our new electric stove (220) had 4 prongs but our 220 receptacle only had -- apparently it doesn't have a separate connector for the Ground? So we installed a replacement receptacle that matches the plug and has 4 internal connectors I will call "poles." My husband ran a ground wire from the green pole in the receptacle to a water pipe, since there was no green wires coming from our supply -- only the two "hot" wires that are wrapped in black rubber and a bunch of about 8 or so bare silver colored wires. He hooked these to one of the inner poles and the stove works!

But I don't like the green wire underfoot and I heard we can use a jumper and link the ground connection to the "common" pole because it can also function as the ground. Is this true? The two HOT wires from the supply line are linked to the two outside poles of the receptacle, then there is an inner green one and another that has all the bare wires connected to it.

I wish my wires had colors like all the articles indicate!

LarryG

12:03PM | 04/28/10
Member Since: 07/22/04
511 lifetime posts
that new stove was used wasn't it.

if you want it to be right you need to run new wire from the breaker box to the stove.

mpinneau

12:09PM | 04/28/10
Member Since: 04/27/10
2 lifetime posts
Yes the stove was used, could you tell because the plug is outdated? The stove was vintage 1999 but the house was built in 1975.

Thanks so much for your advice.

LarryG

02:38AM | 04/29/10
Member Since: 07/22/04
511 lifetime posts
a new stove doesn't come with a cord.

if it had been brand new you would have looked at the receptical in the house and said:

ok i need a 3 prong plug and connected it without removing that bonding strap on the stove.

most people still do.

TimBonham

02:29PM | 04/29/10
Member Since: 01/09/07
197 lifetime posts
Old stoves were wired with 3 wires: 2 hots and a neutral, which also served as the ground. The stove had a 3-connector plug, and inside the stove the neutral & ground were connected together.

New stoves are wired with 4 wires: 2 hots, a neutral and a separate ground wire. The stove will have a cord with a 4-connector plug.

When you want to connect a new stove with a 4-connector plug to old house wiring with a 3-connector receptacle, you can do one of the following:

1. Replace the cord on the stove with a 3-connector one, with the ground & neutral wires connected together inside the stove. (Most stores will do this for you.)

2. Replace the wiring in your house from the main box to the stove location with a 4-wire circuit and a new 4-connector receptacle. This is the best way to do it for the future, but it's also the most expensive, and may be hard to do in a finished house.

3. Keep the 3-wire circuit to the main box, and add a separate wire to a ground point like a water pipe. (This may not be allowed under some local codes.)

Sounds like option 3 was what your husband did. It will work fine (as it does) providing it meets local code. But there are a couple of things to be concerned about:

- is that water pipe really a good ground point? In many houses, with plastic pipes being used for much of the plumbing, that pipe might not have a good connection back to ground. You should test it, to make sure that there is a good circuit from the hots to that ground wire.

- your mention of the ground wire being "underfoot" is worrysome. The wire should be protected, run inside the wall or protected in a conduit, etc. Even though it's not carrying current, having it exposed underfoot is not acceptable -- either to an inspector or to a kitchen user like you! That should be fixed.
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