Electric interlocking handbook by the Engineering staff of the General railway signal company, with an introduction by Wilmer W. Salmon. Henry M. Sperry, editor; Paul E. Carter, assistant editor; ...
When installing conductors for hoistway door interlock wiring, the conductors shall be _____. A) flame retardant and suitable for a temperature of not less than 200°C (392°F) and type SF or equivalent ...
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