3" EMT........Christ are you planning on putting in a new 350A service in your house? You can run 96 x #14 wires in a 3" conduit (before de-rating). Just make sure you use EMT and not PVC in your house as an inspector will fail your inspection (if you have an open permit).
I just ran a string up my pipe chase to get to the second floor - never used it in 15 years. When running underground to out buildings I always recommend running an extra 1" conduit for just in case, but truthfully so many things are controlled wirelessly now (security and lighting control) the only other thing one might need something is for a hot tub or as EVSE close to an out building
a 3” conduit gives you room for more than electrical wire, and it’s very easy to fish.
I’ve only taken advantage of my pre installed conduits a couple of times. i used the conduit to my detached garage for a hot water recirculating line, an intercom to the house and ethernet cable.
In my sons house, we used it to run a 60amp line and a cold water fill line from his mechanical room to a hot tub behind the house.
3" EMT........Christ are you planning on putting in a new 350A service in your house? You can run 96 x #14 wires in a 3" conduit (before de-rating). Just make sure you use EMT and not PVC in your house as an inspector will fail your inspection (if you have an open permit).
Never had issues with pvc electrical conduit inside a house. You can’t use drain line pvc, or abs, but I’ve never been failed on electrical conduit inside.
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