A caution, warning or danger marking is required by the 2023 NEC. Under 110.21(B), which statement describes its field-applied hazard-marking requirements?
- AAny fully handwritten label is sufficient if readable from 3 feet
- It must communicate the hazard, withstand its environment and be permanently affixed; legible handwriting is allowed for variable portions
- CEvery marking must be a riveted engraved-metal plate
- DOnly factory-applied markings can satisfy the requirement
Where to look it up
https://docinfofiles.nfpa.org/files/AboutTheCodes/70/70_A2025_NEC_P01_FD_PIResponses.pdf
Why B is correct
The rule requires effective hazard communication, environmental durability and permanent attachment. Its handwriting exception applies to variable or changeable portions, which must be legible. It does not prescribe engraved metal for every case. Source: unchanged 2023 baseline in NFPA Public Input 3056, PDF page 243 (printed 195); the proposed general font-size addition is not used. https://docinfofiles.nfpa.org/files/AboutTheCodes/70/70_A2025_NEC_P01_FD_PIResponses.pdf