Shocking dishwasher

Old 05-14-18, 01:47 PM
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Shocking dishwasher

Hey everyone,

We got a dishwasher installed and we were intermittently getting shocks from it. It seems that the whole stainless steel surface was conducting electricity. We discovered that it the hot and neutral were reversed so we fixed it afterwards. The dishwasher was hooked to an ungrounded functional GFCI and it did not trip when we we got the shocks.

We remain afraid that it could still give shocks. Is it likely that the shocks were caused by the reversed polarity? Or is it most likely an issue with the dishwasher?

We also now grounded the outlet to a cold water pipe as an extra security layer.

Thank you!
Old 05-14-18, 03:04 PM
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We also now grounded the outlet to a cold water pipe as an extra security layer.
Not good enough. An earth ground is not a safe substitute for a low resistance EGC (Equipment Grounding Conductor.) You need to run a ground wire to the panel ground or, under latest code, to the nearest correctly grounded outlet (receptacle, light, etc).

A GFCI is not a substitute for a ground.
Old 05-28-18, 08:09 AM
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You may likely be able to use a GFCI Circuit Breaker in your panel. This type of circuit breaker has a wire attached to connect to your panel, this type is especially useful if your dealing with an old 2 wire circuit. This will alleviate you having to re-wire through your walls.
Old 05-28-18, 10:15 AM
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A GFI breaker is no different than a GFI receptacle.
An appliance like a dishwasher must be connected with a grounded service cable.
A two wire cable is absolutely not acceptable.
The appliance frame must be grounded properly.

Same goes for a washer and dryer.
Old 05-28-18, 10:28 AM
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Is this a new dishwasher or used? Current NEC requires a dishwasher to have some GFCI protection for personal by either a device or breaker.

A GFCI should function normally without an equipment ground present on either the dishwasher cord or on the branch circuit. In fact, NEC allows a grounded receptacle(s) to be installed on an ungrounded circuit if it is GFCI protected.

If the steel of the dishwasher is becoming energized, then there is something wrong with the dishwasher. Also if the GFCI did not trip when you are touching the steel and something grounded, I think there may be something wrong with the GFCI. You should be able touch the probes on a meter from the steel of the dishwasher to something grounded, and if there is voltage between them the GFCI should trip.

I recommend inspecting both the GFCI and the wiring of the dishwasher to make sure things are correct.

We discovered that it the hot and neutral were reversed so we fixed it afterwards.
That will have nothing to do with the steel getting energized.

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