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I'm installing outlets in my basement on poured concrete walls and will be using EMT for conduit. How high over the top of the concrete walls must the conduit extend? The original wiring has conduit that extends about four inches, but that was 15 years ago. Thanks.

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4 inches was a good call. It gives you room to get above the schmutz from pouring concrete and get an EMT coupler on the pipe, and gives you some spare distance in case the pipe's end gets damaged and needs to be cut back a bit.

The ruling factor is whether you can get an EMT coupler on it. For that I'd recommend at least 2".

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