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334.15(B), 334.19 Protecting Conductors

– Bushings and Sheath Length

Change Summary

• The NEC has added language intended to

protect conductors.

Article 334 Nonmetallic-Sheathed Cable:

Types NM and NMC

334.15 Exposed Work.

(B) Protection from Physical Damage. Cable shall be

protected from physical damage where necessary by rigid

metal conduit, intermediate metal conduit, electrical metallic

tubing, Schedule 80 PVC conduit, RTRC marked with

the sufx -XW, or other approved means. Where passing

through a oor, the cable shall be enclosed in rigid metal

conduit, intermediate metal conduit, electrical metallic

tubing, Schedule 80 PVC conduit, RTRC marked with the

sufx -XW, or other approved means extending at least

150 mm (6 in.) above the oor. Conduit or tubing shall be

provided with a bushing or adapter that provides protection

from abrasion at the point the cable enters and exits

the raceway.

Type NMC cable installed in shallow chases or grooves in

masonry, concrete, or adobe shall be protected in accordance

with the requirements in 300.4(F) and covered with plaster,

adobe, or similar nish.

334.19 Cable Entries. The sheath on nonmetallic-sheathed

cable shall extend not less than 6 mm (1/4 in.) beyond any

cable clamp or cable entry.

Expert Analysis

A new section has been added at 334.15 to ensure

Material taken from the National Electric Code

is reprinted with permission

from NFPA 70

, 2023 edition. National Electrical Code

NEC

Text

continued on page 66