Selective coordination in elevators

Selective coordination in elevators is required when more than one elevator is supplied by a common feeder.

08/19/2013


Figure 2: The graph indicates a 200 amp breaker in the main distribution gear feeding an elevator control panel with a 100 amp and a 70 amp fuse. The study must ensure that the two fuses will trip in a fault condition in any one of the separate elevator fSelective coordination is required when more than one elevator is supplied by a common feeder, per NEC Article 620-62. Figure 2 shows an example of a coordination study illustrating the feeder breaker overcurrent protection, the elevator fuse overcurrent protection, and the elevator motor start-up curves.

 


Keith Lane is president and CEO of Lane Coburn & Assocs. He is a member of the Consulting-Specifying Engineer editorial advisory board, and was a 2008 40 Under 40 award winner. Lane has more than 20 years of experience designing, commissioning, and optimizing mission critical facilities.

- See how selective coordination studies are used in mission critical environments below.



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