Nm Cable In Conduit Nec

Grommets used as required in 300 4 b 1 shall remain in place and be listed for the purpose of cable.

Nm cable in conduit nec.

Exposed type nm cable must closely follow the surface of the building sec. Nonmetallic sheathed cable must be protected from physical damage by rigid metal conduit rmc intermediate metal conduit imc schedule 80 pvc conduit type rtrc xw conduit electrical metallic tubing emt guard strips or other means approved by the. Calculate your conduit fill percentage. Home resources calculators conduit fill calculator.

Provides quick and easy results for the conduit fill percent per nec guidelines. Instead cables must be approved for outdoor use. Back to your nec book. A favorite target of electrical inspectors is the improper use of non metallic cable nm in exposed locations such as basement foundation walls or along the face of studs and joists in unfinished framed spaces.

Even though standard nm cable has a vinyl outer jacket and waterproof insulation around the individual conducting wires it is not intended for use in outdoor locations. If the nm cable is installed where it passes through a floor the cable must be protected for at least 6 inches above the floor by enclosing it in rigid metal conduit intermediate metal conduit or one of the other methods previously mentioned. Rigid nonmetallic conduit or electrical metallic tubing. If you re using electrical metal tubing emt conduit you ll see that the closest size that you need is a 1 in conduit which gives you a 39 fill.

Conduit fill is the percent of area inside the conduit taken up by the cable s. 334 17 through or parallel to framing members. Conduit cable fill chart this chart for conduit size for cable is based on the 2017 nec and uses common. Types nm nmc or nms cable shall be protected in accordance with 300 4 where installed through or parallel to framing members.