A hospital room is designated a wet procedure location. For receptacles subject to 2023 NEC 517.20(A), which pair describes the permitted forms of special electric-shock protection?
- AEquipment ground-fault protection set at 30 mA, or a panel directory label
- BTwo grounding paths alone, or a warning sign
- CArc-fault protection alone, or ordinary overcurrent protection alone
- An isolated power system that limits first-fault current without interrupting supply, or a system that interrupts at the Class A GFCI trip level
Where to look it up
https://docinfofiles.nfpa.org/files/AboutTheCodes/70/70_A2025_NEC_P15_FD_PIResponses.pdf
Why D is correct
Section 517.20(A) provides these two protection alternatives. Ordinary equipment ground-fault or arc-fault protection is not a substitute for this specified protection. The separate exception for circuits supplying only qualifying listed fixed therapeutic and diagnostic equipment has its own conditions. The rule does not establish the original explanation’s blanket claim that every surgery requires isolated power. Source: unchanged 2023 baseline in NFPA Public Input 2100, PDF page 110 (printed 71). https://docinfofiles.nfpa.org/files/AboutTheCodes/70/70_A2025_NEC_P15_FD_PIResponses.pdf