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Should I use PVC conduit or armoured electric cable for my patio that is fully roofed?

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  • May 17th, 2021 8:04 am
[OP]
Member
Sep 23, 2019
280 posts
333 upvotes

Should I use PVC conduit or armoured electric cable for my patio that is fully roofed?

I have a patio that is fully attached to the home and it is roofed. I would like to install 2 motion lights in that patio - one will be fully under roof inside the patio (no chance of getting direct rain) and another will be still under the roof (about 1 foot from the roof edge), but pointing to outside of patio and there is a small chance of some rain reaching it.
I already have an outside power outlet under this patio roof that I will be using to "feed" my motion lights. I know that 14/2 gouge electric cable is more than enough for my 2 LED lighs. But because these lights are outside (even under the roof), what type of conduit should I use?
I was considering buying 1/2in Carlon non-metal liquid-tight conduit and hide my Romex electric cable inside. Or can I just use Southwire AC90 Armoured electric cable?

Thank you!
4 replies
Sr. Member
Dec 6, 2020
816 posts
875 upvotes
Use outdoor rated NMWU or TECK cable. If there is any risk of any of the junction boxes that will be associated with these lights being exposed to water (including snow or wind-driven rain), use waterproof junction boxes, TECK cable, and appropriate fittings.

You can't use AC90 as it isn't rated for use in damp locations (i.e. outdoors). Further, running multi-conductor cables inside conduit isn't allowed. If you want to use conduit, you must use individual wires (not cable) specifically rated for use inside conduit. This is usually difficult to find in small quantities.

Incidentally, for most residential circuits, wiring is sized sized according to size of the upstream the circuit breaker rather than the size of the load. All wiring downstream of a circuit breaker must be capable of supplying the full ampacity that the circuit breaker will provide before tripping. If you have a 15 amp circuit, you must use 14/2 or larger wiring even if you're only powering a 50mW nightlight. There are exceptions to this for specialized circuits but this is the rule for general purpose circuits.
[OP]
Member
Sep 23, 2019
280 posts
333 upvotes
middleofnowhere wrote: Use outdoor rated NMWU or TECK cable. If there is any risk of any of the junction boxes that will be associated with these lights being exposed to water (including snow or wind-driven rain), use waterproof junction boxes, TECK cable, and appropriate fittings.

You can't use AC90 as it isn't rated for use in damp locations (i.e. outdoors). Further, running multi-conductor cables inside conduit isn't allowed. If you want to use conduit, you must use individual wires (not cable) specifically rated for use inside conduit. This is usually difficult to find in small quantities.

Incidentally, for most residential circuits, wiring is sized sized according to size of the upstream the circuit breaker rather than the size of the load. All wiring downstream of a circuit breaker must be capable of supplying the full ampacity that the circuit breaker will provide before tripping. If you have a 15 amp circuit, you must use 14/2 or larger wiring even if you're only powering a 50mW nightlight. There are exceptions to this for specialized circuits but this is the rule for general purpose circuits.
Middleofnowhere, thank you very much for your reply! I cannot find TECK cable at homedepot, so I will get NMWU cable.
Can you please clarify about appropriate fittings, specifically:
For a junction box like this: https://www.homedepot.ca/product/red-do ... 1000103681
Is this an appropriate connector: https://www.homedepot.ca/product/ibervi ... 1000138189
Deal Fanatic
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Jun 21, 2003
5316 posts
2555 upvotes
Stoney Creek, ON
RedFlagAlias wrote: Middleofnowhere, thank you very much for your reply! I cannot find TECK cable at homedepot, so I will get NMWU cable.
Can you please clarify about appropriate fittings, specifically:
For a junction box like this: https://www.homedepot.ca/product/red-do ... 1000103681
Is this an appropriate connector: https://www.homedepot.ca/product/ibervi ... 1000138189
No , you want this. While I like to use Teck for outdoor feeds that I’m burying it would really increase the cost of your small project. I would say what you are doing is too small to warrant the cost of teck. The connectors are $20-$40 each and you’d have 4 of them. NWMU is the way to go in your case.

Also, just as an FYI flexible PVC would not be the proper conduit to use if you had gone that route. You’d need to use solid PVC.
[OP]
Member
Sep 23, 2019
280 posts
333 upvotes
ChicoQuente wrote: No , you want this. While I like to use Teck for outdoor feeds that I’m burying it would really increase the cost of your small project. I would say what you are doing is too small to warrant the cost of teck. The connectors are $20-$40 each and you’d have 4 of them. NWMU is the way to go in your case.

Also, just as an FYI flexible PVC would not be the proper conduit to use if you had gone that route. You’d need to use solid PVC.
ChicoQuente - thank you very much for your reply!

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