NEC 517.13 / NFPA 99 Section 6.3.3.2

NEC 501.10(B) / NEC 501.15

All conduit fittings in Class I, Division 2 locations must be listed for the specific hazardous classification. Standard fittings can allow ignitable concentrations of gas to migrate through the conduit system. NEC 501.10(B) requires conduit seals and listed fittings to prevent gas migration and potential ignition.

NEC 501.125(B)

This is code-compliant. NEC 501.125(B) explicitly permits the installation of open or nonexplosionproof enclosed motors — such as squirrel-cage induction motors WITHOUT brushes, switching mechanisms, or similar arc-producing devices — in Class I, Division 2 locations. Explosionproof or totally-enclosed construction is NOT required for these motors in Division 2. An ODP squirrel-cage induction motor with no normally-arcing components is precisely the type the code allows, and the engineer's reasoning is sound: Division 2 means a flammable concentration is present only under abnormal conditions, and a brushless induction motor has no arc source during normal operation. The only conditions are that the motor has no arc-producing devices (satisfied here) and that its maximum external surface temperature not exceed the temperature limit (T-code / 80% of the gas group autoignition temperature). The scenario states no over-temperature condition, so the installation passes. (Had the scenario specified a surface temperature exceeding the gas AIT limit, it would fail — but as written it does not.)

NEC 501.15(A)

NEC 501.15(A) requires conduit seals at every point where conduit passes from a Class I, Division 1 or 2 area into an unclassified area. Without the seal, flammable gases or vapors can migrate through the conduit system into unclassified areas, creating an explosion hazard in spaces not designed for it.

NEC 517.13(B)

NEC 517.13(B) requires an equipment grounding conductor to connect the grounding terminal of all receptacles and fixed electrical equipment in patient care areas to the patient equipment grounding point. An unbonded bed frame can develop a voltage potential difference relative to other grounded equipment — if a patient simultaneously touches the bed and a grounded IV pole, even a small voltage difference can cause microshock.

NEC 517.160(A)(5)

NEC 517.160(A)(5) requires the line isolation monitor indicator to be visible to personnel in the anesthetizing location. If the surgical team cannot see the LIM display, they will not know when hazard current has reached dangerous levels, and they cannot take corrective action by removing suspect equipment before a second fault causes a ground fault current through a patient.

NEC 517.18(B) / NEC 517.18(A) / NEC 517.21

This fails the current code. Since the 2014 NEC, NEC 517.18(B) requires a minimum of EIGHT receptacles at each general-care (Category 2) patient bed location (critical-care locations require 14). 'Four' is an obsolete pre-2014 figure. The scenario installs only four receptacles, which is below the minimum of eight, so the install is non-compliant. Note also that the count requirement lives in 517.18(B); 517.18(A) covers the two-branch-circuit supply rule requiring at least one receptacle on the normal branch and one on the critical branch of the essential electrical system, with the essential-system receptacle identified by distinctive color or marking. The remaining details are correct: NEC 517.21 exempts general-care patient bed locations from GFCI requirements (nuisance GFCI trips could de-energize life support equipment), hospital-grade receptacles (green dot) are required, and the GFCI-protected bathroom receptacle satisfies NEC 210.8. But the four-receptacle count is the controlling failure.