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(B) Branch-Circuit Wiring
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Branch circuits supplying only listed, fixed, therapeutic and diagnostic equipment, permanently installed above the hazardous (classified) location and in unclassified locations, shall be permitted to be supplied from a normal grounded service, single- or three-phase system, provided the following apply:
- Wiring for grounded and isolated circuits does not occupy the same raceway or cable.
- All conductive surfaces of the equipment are connected to an equipment grounding conductor.
- Equipment (except enclosed X-ray tubes and the leads to the tubes) is located at least 2.5 m (8 ft) above the floor or outside the anesthetizing location.
- Switches for the grounded branch circuit are located outside the hazardous (classified) location.
Exception: Sections 517.63(B)(3) and (B)(4) shall not apply in unclassified locations.
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