Does anyone know if interlock and car dooor bypass switches are required in the controller for hydraulic elevators. I know they are required for electric elevators Rule 210.14.I can't find any thing under Section 300 In the code book that says you need them. Any comments would be appreciated. One inspector says we need it5 on a 3 stop hydro and one inspector says we don't need it.

-- Don Pfuntner (brandon1@frontiernet.net), December 15, 2000

Answers

THE ONLY BY PASS SWITCHES I KNOW OF ARE THE ONES FOR OVERBRIDGING THE CAR AND LANDING DOOR CIRUITS WHEN RELEVELING DUE TO OIL SEEPAGE THIS ALLOWS LIFT TO RELEVL WITH DOORS OPEN I HOPE THIS HELPS DAVE

-- DAVE BETH (DAVIDBETH380@HOTMAIL.COM), February 02, 2004.

The bypass switches Don is talking about are required in ASME A17.1. The purpose is to enable a mechanic to operate the elevator on car top inspection, with an open door lock circuit, so that you may run the car to find the bad door lock contact. The elevator authorities did not adopt this part of the code in Michigan, so we never had to apply it. Personally I question the logic of providing a simple switch on the elevator controller to jump out the door locks.

I would suggest that you refer to the code handbook and check the comments, and interpertations on 210.14.

-- Mike (mlardner@lardnerelevator.com), February 02, 2004.