Flat Type NM cable turns a corner in a wall cavity. Under the 2023 NEC 334.24 rule, what minimum radius applies at the inner edge of the bend?
- Five times the cable’s major diameter dimension
- BThree times the cable’s minor diameter dimension
- CTen times the cable’s major diameter dimension
- DTwice the cable’s minor diameter dimension
Where to look it up
https://docinfofiles.nfpa.org/files/AboutTheCodes/70/70_A2025_NEC_P06_FD_MeetingAgenda_0124.pdf
Why A is correct
The 2023 rule uses five times the cable diameter and specifies the major dimension for flat cable. Measure at the inner edge and avoid damaging the cable. Source: 2023 baseline 334.24 reproduced in NFPA Public Input 1555, PDF page 255 (printed 173); the proposed replacement of “major” is not used here. https://docinfofiles.nfpa.org/files/AboutTheCodes/70/70_A2025_NEC_P06_FD_MeetingAgenda_0124.pdf