Section 296-96-11057. What requirements apply to "up-limit stops"?

(1) Two separate automatic stop devices must be provided to cut off the power and apply the brake when a loaded step passes the upper terminal landing. One of these devices must consist of a switch mechanically operated by the belt or stop roller. The second device must consist of any of the following:

(a) A roller switch located above but not in line with the first switch;

(b) A photocell and light source (an "electric eye"); or

(c) A switch activated by a lever, bar, rod or plate.

(i) If a plate is used, it should be positioned above the head pulley so it barely clears a passing step.

(ii) If a bar is used, the bar must be of the "breakaway" type.

(2) The stop device must stop the lift before a loaded step reaches a point 24 inches above the top terminal landing.

(3) Once the lift has stopped, the automatic stop device must be manually reset. Therefore, this device must be located on the top landing where the reset person has a clear view of both the "up" and "down" runs of the lift; and it must be impossible to reset from a step.

(4) Electric stop devices must meet the following requirements:

(a) All electric switches that directly open the main motor circuit must be multiple type switches;

(b) Photoelectric devices must be designed and installed so that failure of the light source, the light sensitive element or any vacuum tube used in the circuit will result in shutting off power to the driving motor;

(c) In areas where flammable vapors or dust may be present, all electrical installations must be in accordance with the NEC requirements for those installations; and

(d) All controller contacts carrying main motor current must be copper to carbon types unless the circuit is simultaneously broken at two or more points or the contacts are immersed in oil.

[Statutory Authority: RCW 70.87.020, 70.87.030, 70.87.034, 70.87.120, 70.87.185, 70.87.190, 2002 c 98, 2003 c 143 and 2004 c 66. WSR 04-12-047, § 296-96-11057, filed 5/28/04, effective 6/30/04. Statutory Authority: RCW 70.87.020, 70.87.030, 70.87.034, 70.87.120, 70.87.185 and chapter 70.87 RCW. WSR 01-02-026, § 296-96-11057, filed 12/22/00, effective 1/22/01.]

RCW 70.87.020, 70.87.030, 70.87.034, 70.87.120, 70.87.185, 70.87.190, 2002 c 98, 2003 c 143 and 2004 c 66. WSR 04-12-047, § 296-96-11057, filed 5/28/04, effective 6/30/04. Statutory Authority: RCW 70.87.020, 70.87.030, 70.87.034, 70.87.120, 70.87.185 and chapter 70.87 RCW. WSR 01-02-026, § 296-96-11057, filed 12/22/00, effective 1/22/01.