Raceway and Box Fill Flashcards

Per NEC 358.12, where is EMT (Electrical Metallic Tubing) NOT permitted to be installed?

Answer: Where subject to severe physical damage, in cinder concrete, and in hazardous locations (with exceptions)

NEC 358.12 prohibits EMT where subject to severe physical damage, embedded in cinder concrete unless protected, and in certain hazardous locations.

Per NEC 314.27(A)(1), what minimum weight must a standard outlet box be listed to support for a ceiling-mounted luminaire?

Answer: 50 pounds

NEC 314.27(A)(1) requires that outlet boxes used as the sole support for luminaires must be listed for the weight to be supported, with a minimum of 50 pounds.

What NEC section provides the volume allowances per conductor based on wire gauge for box fill calculations?

Answer: NEC Table 314.16(B)

NEC Table 314.16(B) provides the volume allowance per conductor for each AWG size used in box fill calculations.

Per NEC 314.28(A)(2), what is the minimum distance calculation for an angle pull in a pull box with a 3-inch conduit?

Answer: 18 inches (6 x 3)

For an angle pull, NEC 314.28(A)(2) requires 6 times the trade size of the largest raceway entering that wall. 6 x 3 = 18 inches minimum, plus the sum of other raceways on the same wall.

Per NEC 312.8, what is the requirement when switches or overcurrent devices are enclosed and conductors enter through the top?

Answer: Sufficient wire bending space must be provided, and conductors must not fill the wiring space at any cross-section to more than 40%

NEC 312.8 requires adequate bending space and limits wire fill to prevent overheating and allow safe installation.

What is the minimum trade size EMT conduit permitted for general wiring per NEC 358.20?

Answer: 1/2 inch

NEC 358.20(A) establishes 1/2-inch (metric designator 16) as the minimum trade size for EMT.