Underground Feeder Wire OK in Basement?


You can use UF cable any place where you might use NM-B cable indoors.

Art 334 is NM cable

Art 340 is UF cable

NEC 2011

Article 340 Underground Feeder and Branch-Circuit Cable: Type UF

II. Installation

340.10 Uses Permitted

Type UF cable shall be permitted as follows:

(1) For use underground, including direct burial in the earth. For underground requirements, see 300.5.

(2) As single-conductor cables. Where installed as single-conductor cables, all conductors of the feeder grounded conductor or branch circuit, including the grounded conductor and equipment grounding conductor, if any, shall be installed in accordance with 300.3.

(3) For wiring in wet, dry, or corrosive locations under the recognized wiring methods of this Code.

(4) Installed as nonmetallic-sheathed cable. Where so installed, the installation and conductor requirements shall comply with Parts II and III of Article 334 and shall be of...

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I understand that for feeder wire from a service entry panel to a subpanel the conductor wires need to be sized according to 125% of the continuous load plus 100% of the non-continuous load. I've also found various definitions (CEC and non-residential NEC) for continuous loads being those on for more than 1 hour in a 2 hour period.

For residential usage, I generally won't have all the continuous loads running simultaneously (ex. lights, an EV charger, HVAC, etc.), so do I still have to sum all the continuous loads or can I size for an average continuous load?

EDIT: The question also applies to non-continuous loads. Do I need to sum all of them, even if not all will be active...

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Article 352 - Rigid Polyvinyl Chloride Conduit: Type PVC

II. Installation

352.10 Uses Permitted. The use of PVC conduit shall be permitted in accordance with 352.10(A) through (H).

(F) Exposed. PVC conduit shall be permitted for exposed work. PVC conduit used exposed in areas of physical damage shall be identified for the use.

(G) Underground Installations. For underground installations, homogenous and nonhomogenous PVC shall be permitted for direct burial and underground encased in concrete. See 300.5 and 300.50.

Article 300 - Wiring Methods

I. General Requirements

300.5 Underground Installations.

(D) Protection from Damage. Direct-buried conductors and cables shall be protected from damage in accordance with 300.5(D)(1) through (D)(4).

(4) Enclosure or Raceway Damage. Where the enclosure or raceway is subject to physical damage, the conductors shall be installed in rigid metal conduit, intermediate...

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This is my first post here, but I have been lurking around these forums for quite awhile now and have always found them a useful source of info.

I pulled a permit and installed a 100amp subpanel in my basement about 6 feet away from the main service panel (200amp service). The main panel and all of the wiring in the house was replaced about 2 years ago (very old house). I only had two slots left in the main panel and I needed to add circuits for my beer brewery (30amp 240v) and several circuits for my shop tools, hence the decision to do a sub panel. I was hoping to share the details and pictures of what I did and get thoughts on whether everything looks good or if I made an egregious errors before I schedule the inspection. So here goes:

1. I used 1-1/4 PVC conduit to connect the two panels. The conduit take a total of 4 90degree turns due to the way the concrete walls are in the basement. I believe this should be fine with respect to code. The conduit is...

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Installing an underground power line

Cable depth options

Underground cable for running electrical power to a remote location can be installed at different depths, depending on the type of conduit and type of wire used.

Dig 6 inches

For a 6-in. deep trench, use galvanized rigid metal electrical conduit with individual conductors inside.

Dig 12 inches

For a 12-in. deep trench, you can direct-bury GFCI-protected underground feeder cable with a short length of PVC conduit at the house.

Dig 18 inches

At 18 inches, you can use THWN-2 conductors inside a continuous length of PVC conduit, which protects the wire all the way through the trench to the house.

Dig 24 inches

At 24 inches you can bury underground feeder cable, using PVC conduit to 18 in. below ground only where the wire comes up.

If you’re considering running a power lineunderground through your yard, you have four options. Your choice depends on...

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When dealing with service entrance cables on new homes, the question often comes up about underground and overhead feeders. Are underground feeds better than overhead feeds? Well, to determine which is best for you, we’ll look at the differences and how each may benefit you. As far as the utility company is concerned, one is just as good as the other and they can install either one for you. But there are differences and here they are.

Underground Service

Underground services are, well, underground. The wires are connected to the utility company’s pole, fed down a pipe into the ground, and through a bored hole in the ground, run into a ground-based transformer. That’s called the line connection, or the primary connection to the transformer. The secondary side of the transformer has wires connected to it that are bored to the electric meter connected to a pole or side of your home. The advantage of the underground feed is that there are no visible wires present and...

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