Asked by: Lachelle Requeijo
asked in category: General Last Updated: 4th February, 2020

Can you use indoor wire outside in conduit?

Under the 2008 code, you must use UF cable anytime NM-style cable (even in conduit) exits the side of the house. That is, you are no longer allowed to put NM-B cable in watertight conduit outside of the house in wet locations.

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Simply so, can indoor wire be used outdoors in conduit?

MC cable can be used indoors and outdoors because the ground wire is an insulated THHN THWN wire as well. The common use for MC cable is indoors because it can be used without conduit for a much easier installation. Copper and Aluminum MC cable can also be used in conduit.

Similarly, what kind of wire do you use for outdoor conduit? Type UF cable is the most commonly used nonmetallic cable for residential outdoor wiring runs. UF cable can be direct-buried (without conduit) with a minimum of 24 inches of earth cover.

In this regard, does outdoor wiring need to be in conduit?

Generally, local codes require that outdoor wiring be protected by conduit in an instance in which outdoor wiring is installed above ground. If wiring will be buried, most codes allow Type UF cable. However, some require that Type TW wire and conduit be used.

Can you use Romex outside in conduit?

No. Romex+outside in conduit= wet location. Conduit which is not subject to any weather would be OK, but very few outdoor locations fit that description. The bottom line is this: if you could use NM there without conduit, then you could sleeve it in conduit.

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