Installation of several electrical distribution boxes in the elevator machine room

Elevator machine rooms must primarily house elevator-related electrical equipment, with dedicated circuits and disconnects, while non-elevator distribution panels are generally restricted or require careful code review.

Dedicated Circuits and Distribution Panels

Each elevator requires separate, dedicated branch circuits for motor power, cab lighting, receptacles, and HVAC systems. Main power circuits are typically 240VAC, 30 Amp for the motor and controls, while cab lighting uses 120VAC, 20 Amp circuits. Machine room and pit receptacles must have GFCI protection on their own dedicated circuits, and lighting should be switched at accessible locations for staff safety ( ). Overcurrent devices and disconnects must be lockable, accessible to qualified personnel, and provide a single means to disconnect ungrounded conductors. For multiple elevators, selective coordination of feeders is required, and panels are often installed in the machine room to serve all elevators ( ).

Placement of Disconnects

NEC Article 620.51 and common practice indicate that disconnects should be located near the machine room entrance for quick access. In some jurisdictions, such as NYC, separate fused disconnects at the door are required even if a panel exists inside the room ( ).

Restrictions on Non-Elevator Equipment

According to NEC 620 and state amendments like Oregon's OESC 620.37, only wiring and devices directly related to the elevator are permitted in machine rooms. This includes circuits for elevator motors, lighting, HVAC, fire detection, and communication systems. Non-elevator distribution panels, such as those serving air handling units, are generally not allowed unless explicitly approved by local code authorities, as they may interfere with safety and inspection compliance ( ).

Wiring and Conduit Considerations

• Conduits and raceways should only enter the machine room to the extent necessary to connect elevator devices.
• Conductor fill in wireways must comply with NEC limits (typically not exceeding 20% of the interior cross-sectional area).
• Only elevator-related wiring is permitted in hoistways and machine rooms, and grounding/bonding must follow Article 250 ( ).

Best Practices

• Coordinate early with the general contractor, electrician, and elevator specialist to ensure all circuits, disconnects, and panels meet code before rough-in ( ).
• Avoid placing non-elevator equipment in the machine room unless local code explicitly allows it.
• Ensure all disconnects are clearly labeled and accessible for maintenance and emergency shutdown. In summary, while multiple distribution boxes for elevator circuits are standard and code-compliant, installing non-elevator panels in the machine room is generally prohibited unless approved by local authorities. Proper planning, dedicated circuits, and accessible disconnects are essential for safety and compliance.