Can I use Romex NM cable for new branch circuits in my house with existing electrical conduit circuits, or do I need to stick with EMT conduit throughout?
Asked by Mason Chow 
2 weeks ago
Last Updated: September 10, 2024
Hey there! I’ve got some electrical conduit circuits in my old house’s basement and garage. I’m looking to add some branch circuits and new wiring. As long as I do it right, can I use Romex NM cable for the new wiring, or do I need to stick with EMT/conduit all the way? Thanks!
Local codes might ask for conduit. You can also run a new single strand wire through the existing conduit and keep the current one there. If you want to add another outlet, you should be able to connect it to a junction box and use romex.
I guess what I meant was, under the NEC, can I mix the two types? Do I have to use only EMT for add-ons in the basement and garage since they already have EMT?
If you’re doing it, I don’t see any reason not to. However, if it’s local code and let’s say there’s a fire, you may not be covered, for example.
If you’re in Chicago, you gotta check with the local building inspectors. They might have a requirement for it.
Is in Saint Paul, not Chicago. By saying “it’s required”, are you saying EMT needs to be used with an existing EMT installation?
Hey , he means in Chicago they insist on EMT, no matter where you are.
Hey , I think that’s how it’s said. But I could be mistaken, at least in Minnesota. Chicago has its own rules. To be completely sure, reach out to the St. Paul building inspector’s office since they are the ones setting the code. But I’m pretty certain that if the building is wired this way, all new wiring needs to be similar.