![]() ![]() If a smoke detector goes into alarm, it signals the elevator to go into “Fire Recall Function,” at which point the controller directs the elevator cab to travel to its pre-programmed designated landing, open its doors, and remain stopped there until the alarm clears. Smoke detectors, which are required in all elevator lobbies and elevator equipment rooms, must be connected to the elevator controllers directly by means of auxiliary contacts and wiring, or indirectly by means of output signals from the fire alarm control panel. In the event of a breakdown, that phone must automatically call a location staffed 24 hours a day. The Americans with Disabilities Act Accessibility Guidelines for Buildings and Facilities (ADAAG) now require the cab to have a special phone accessible by individuals with disabilities. ![]() You'll need to run telephone cables to the equipment room control panel, but the elevator supplier will take care of getting the cables to the elevator cab. Otherwise, specify that the elevator supplier provide a battery back-up unit to power the lights in the event of an outage. If the building has emergency power available, use it to supply the cab lights. The conduit alone can't act as the grounding means.Įlevator cab lights require emergency back-up power. You must run a separate insulated grounding conductor with the feeder conductors from the electrical source to the elevator controller. A separate 120VAC, 15A circuit is required for cab lighting and accessories, and it must have its own local disconnect and OCPD in the equipment room as well. This device must be either a fused disconnect or a circuit breaker because ANSI/ASME A17.1 requires you to install an additional overcurrent protection device (OCPD) in the elevator equipment room. Power for the elevator controller must first enter a lockable safety disconnect device, located adjacent to the door of the equipment room. The circuit(s) for the lighting and receptacles must be dedicated to the elevator area only. You need at least one 120VAC GFCI-protected receptacle at each location. above the seal plate, adjacent to the ladder. The light switch in the pit must be mounted 42 in. The light switch for the equipment room must be adjacent to the entrance door on the latch side. Luminaires must be lensed or equipped with wire guards to protect the lamps. ![]() You'll be responsible for specifying the items related to the fire alarm and some controls, as well as supplying lighting and power to the equipment room and elevator pit.įirst, you'll need to install lighting in the elevator equipment room ( Photo 1) and shaft pit ( Photo 2). Your elevator supplier will take care of all the wiring and related code requirements for the elevator cab and the various controls. A traction elevator's equipment room is typically located at the top of the building, directly over or adjacent to the shaft. The elevator equipment room that serves a hydraulic elevator is almost always located on the lowest floor adjacent to the elevator shaft. Motors for traction elevators were traditionally DC or synchronous, but new installations use AC motors and VFDs for speed control. Traction elevators raise and lower the elevator cab with cables, a pulley system, and counter weights powered by a motor at the main drive wheel. In such cases, it's economically justifiable to specify a traction type elevator. Cylinders in hydraulic elevators usually aren't suitable for buildings taller than five stories. Limit switches placed throughout the height of the shaft communicate with the controller and stop the cab at each landing. Fluid pressure in the cylinder raises and lowers the elevator cab. The pump sends hydraulic fluid from the reservoir to the cylinder, buried deep below the elevator shaft. Hydraulic elevators comprise a hydraulic reservoir, pump, cylinder, and controller. The two main types of elevators are hydraulic and traction. And as the designer, you can become the fulcrum on which all of these requirements and authorities exert their leverage, but an understanding of elevator basics can help you handle the pressure. As they review the plans and the construction site, they may have conflicting interpretations or requirements. The many codes and guidelines that regulate the electrical design of an elevator can seem overwhelming, and dealing with the electrical inspector, elevator inspector, and Fire Marshal can be even more intimidating. When you're designing an electrical system for a building, don't let elevator requirements bring you down.
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