Article 620 of the National Electrical Code (NEC) 2023 edition outlines the requirements for electrical installations associated with elevators, dumbwaiters, escalators, moving walks, platform lifts, and stairway chairlifts. These types of equipment are common in buildings of all types, from residential homes to commercial skyscrapers, and proper electrical installation is essential for their safe and reliable operation.
Article 620 covers a wide range of topics related to elevator and lift electrical installations, including power supply, wiring methods, grounding, overcurrent protection, disconnecting means, and control circuits. Let’s take a closer look at some of the key requirements outlined in this article.
Power Supply
According to Article 620, elevators and other lift equipment must be supplied with power from a dedicated circuit. This circuit must be protected by a suitable overcurrent device and must be rated for the voltage and current requirements of the equipment. The power supply must also be equipped with a disconnect switch located within sight of the equipment, which is used to de-energize the equipment in the event of an emergency.
Wiring Methods
Article 620 requires that wiring for elevators and other lift equipment be installed using approved wiring methods. This includes conduit, cable trays, and other appropriate wiring methods that provide protection against mechanical damage and electrical hazards. Wiring must be installed in accordance with the manufacturer’s instructions and must be adequately supported and protected.
Grounding
Proper grounding is essential for the safe and reliable operation of elevator and lift equipment. Article 620 requires that all metal parts of the equipment be grounded to prevent the buildup of static electricity and to ensure that the equipment is properly bonded to the building’s grounding system.
Overcurrent Protection
Overcurrent protection is essential for preventing electrical fires and other hazards. Article 620 requires that all circuits and equipment associated with elevators and lifts be protected by overcurrent devices, such as fuses or circuit breakers. These devices must be sized in accordance with the equipment’s current rating and must be capable of interrupting the maximum available fault current.
Disconnecting Means
A disconnecting means is required to de-energize elevator and lift equipment during maintenance or emergency situations. Article 620 requires that a disconnecting means be located within sight of the equipment and be readily accessible for use. This switch must be clearly labeled and identified as the disconnecting means for the elevator or lift equipment.
Control Circuits
Elevator and lift control circuits must be designed to prevent unintended operation and ensure safe and reliable operation. Article 620 requires that control circuits be designed and installed in accordance with the manufacturer’s instructions and must comply with applicable NEC requirements.
Maintenance and Inspection
Proper maintenance and inspection are essential for ensuring the safe and reliable operation of elevator and lift equipment. Article 620 requires that all elevator and lift equipment be inspected and tested in accordance with applicable standards and codes. This includes regular inspections of equipment, controls, wiring, and other associated components.
Conclusion
Article 620 of the NEC 2023 edition provides essential guidelines for the safe and reliable installation, operation, and maintenance of elevators, dumbwaiters, escalators, moving walks, platform lifts, and stairway chairlifts. Compliance with these guidelines is critical for ensuring the safety and well-being of building occupants and maintenance personnel, as well as the reliable and efficient operation of these important pieces of equipment. Building owners and managers must prioritize compliance with Article 620 of the NEC to ensure the safe and efficient operation of their elevators and lifts, as well as to comply with applicable laws and regulations.