We are going to pour a concrete slab in a shop that currently has no floor. My husband wants to lay the electric in/under the slab instead on going overhead. Can we do this? If so, what's the best process?

Install conduit, you should be fine.

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Originally Posted by movingonup

We are going to pour a concrete slab in a shop that currently has no floor. My husband wants to lay the electric in/under the slab instead on going overhead. Can we do this? If so, what's the best process?

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A gentleman I worked for many years ago used a very good system for recording information "just for emergencies". He took pictures of the electrical lines, water lines and sewage lines just before everything was filled then laid measurements (from edges of the slab) over the pix for precise location in the event of later problems.

Oh, sorry. I forgot to mention that this was on a shop similar to what yours seems to be.

If it were me... I'd sure pull a building permit... have it inspected and then pour the concrete. You don't want to have to deal with the building department folks at some time in the future if they cite you for not getting a permit. You may have to abandon the under-slab circuit... or even cut the concrete to remove the conduit that they can claim causes a void that isn't allowed by your local codes. There is almost always a minimum trench depth that is req'd.

Always better "safe than sorry" and that can really be true with municipal agencies.

Use plastic conduit NOT heavy wall galvanized.