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Old 09-26-2008, 07:41 AM   #1
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GROUND - Wall Oven - Water Line Acceptable?


I looked, found lots of information - but each case is different and none like mine.
Replacing a Standard range that has a three wire pig-tail (Red, Black, White). Have to move the electrical about 9 feet, which will cause a splice - not a problem. New wall oven is three wire with ground. Instructions recommend a ground, but state that ground can be tied to the nuetral (white). Have a copper cold water pipe located about six horizontal and six vertical feet away. This water line either comes through the slab or comes off a bathroom and runs through the wall to its location (water supply for refrigerator). I can cut the sheet rock away and make a ground connection. Then have to patch the sheetrock. Question - is it worth the effort to get a ground, or just connect the ground to the nuetral.
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Michael

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Old 09-26-2008, 07:44 AM   #2
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GROUND - Wall Oven - Water Line Acceptable?


Under code you are not permitted to extend the three wire oven circuit. You must replace it with a four wire circuit.
You are not permitted to use the water line as the ground.

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Old 09-26-2008, 11:55 AM   #3
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GROUND - Wall Oven - Water Line Acceptable?


Run a new four wire circuit from the main panel. If you had a four wire cable to start with then you could have spliced the conductors in a accessible j-box.
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Old 09-27-2008, 11:27 AM   #4
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GROUND - Wall Oven - Water Line Acceptable?


It can be very dangerous to connect a ground to a neutral. Don't do that. The problem is if the neutral connection is lost, the metal frame of the appliance can become energized and electrocute you!

Note that it is not uncommon for a neutral connection to come loose.

Then when splicing higher amperage wires, a regular connection will not be good enough. For example on a circuit breaker panel, the label will say to torque (with a torque wrench) the main lugs to a certain tightness in foot pounds. If the lugs are not tight, the connection can become warm or hot.

Connecting a ground to a nearby water pipe is not a good idea. This is because a plumber (or homeowner) may come along in the future and replace metal pipe with plastic pipe. Then no more ground. Also best to have a "central point of ground".

In other words, it is best and safest to run a new 4 conductor wire from the panel and use a new 4 conductor cord.
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Old 09-29-2008, 11:51 AM   #5
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GROUND - Wall Oven - Water Line Acceptable?


Instead of fighting a new 4-wire cable can I run a separate #8 (or #6) ground from the panel to the outlet? This would be a separate wire though it would be tied the entire length to the 3-wire cable.
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Old 09-29-2008, 12:02 PM   #6
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GROUND - Wall Oven - Water Line Acceptable?


Quote:
Originally Posted by Mickey53 View Post
Instead of fighting a new 4-wire cable can I run a separate #8 (or #6) ground from the panel to the outlet? This would be a separate wire though it would be tied the entire length to the 3-wire cable.
NO, this is not allowed nor is it a good idea.


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