Only such electrical wiring, raceways, and cables used directly in connection with the elevator or dumbwaiter, including wiring for signals, for communication with the car, for lighting, heating, air conditioning, and ventilating the elevator car, for fire detecting. Only such electrical wiring, raceways, and cables used directly in connection with the elevator or dumbwaiter, including wiring for signals, for communication with the car, for lighting, heating, air conditioning, and ventilating the elevator car, for fire detecting. NEC Article 620 prescribes wiring, protection, grounding and installation rules for elevators and related equipment. Each car, machine room and hoistway pit must have separate dedicated branch circuits for lighting, receptacles and HVAC, with car and machine-room lighting exempt from GFCI while. NEC Article 620 outlines the requirements for the installation, operation, and maintenance of various lifting devices, including elevators, dumbwaiters, escalators, moving walks, platform lifts, and stairway chairlifts. Here is a comprehensive overview of the key sections within this article: This. In Oregon, Raceways and conduits for the connection of elevator devices shall only enter the machine room to the extent necessary to connect the devices attached thereto. This advantage makes VVVF systems highly sought-after in high-rise buildings where energy efficiency and. The purpose of this T/C is to clarify wiring that is permitted to be located in an elevator hoistway, machine/control room, or control space/room. Full 6 foot clearance in front of it. Contractor back charged 4k for re inspection.