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Nate Nagel Nate Nagel is offline
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Default How to ground electric outlets over a slab?

RJ wrote:
On Mon, 27 Apr 2009 19:21:30 -0700, Jonathan Sachs
wrote:

I used to own a house that was built on a stemwall foundation. I
grounded the electric outlets by drilling a hole up through the bottom
plate under each outlet box, pushing ground wires up through the hole,
and fishing them into the box.

I'm now buying a house that is built on a slab, and many of the
outlets are ungrounded. How should I deal with the problem in this
case?


How many appliances require a grounded ( 3 pin ) outlet ?
In my house, that woiuld be the washing machine, and the fridge.
As far as I know, all other plug-ins use a ( 2-pin ) polarized plug.

So, unless your community requires 3-hole sockets, why bother ?
Just be sure that the wide slot is "neutral".


In my case, we have awful power, so I have two UPSes and tons of surge
suppressors. If the worst should happen, the "protected equipment
warranty" is void unless the UPS or surge suppressor is connected to a
grounded outlet.

This may sound like a far-fetched scenario for many people, but a whole
mess of people in my neighborhood lost a lot of electronics a year or so
ago when there was an "incident." Even with my "massive overkill"
approach to surge protection, I lost a circuit board in my air filter
(at that time not protected; now it is) a circuit board in my dishwasher
(only protected by the main panel surge suppressor because it's
hardwired) and a really old surge strip. Dominion Power denied any
responsibility; I repaired all the equipment myself so the cash outlay
was below what our homeowner's deductable would have been. (lost
receipt for the main surge suppressor breaker)

nate

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