Pennsylvania Code
Title 34 - LABOR AND INDUSTRY
Part I - Department of Labor and Industry
Chapter 7 - ELEVATORS, LIFTS, ESCALATORS, DUMBWAITERS, HOISTS ANDTRAMWAYS
Subchapter J - ESCALATORS
Section 7.322 - Drive
Universal Citation: 34 PA Code ยง 7.322
Current through Register Vol. 54, No. 38, September 21, 2024
(a) Motive power arrangement-all installations. Each escalator shall preferably be driven by an independent electric motor but under no circumstances shall more than two escalators be driven by one motor. The latter arrangement is permissible only when the two are placed so closely together as to be practically one unit.
(b) Chains. The strength of chain drives shall conform to the following:
(1)
New installations.
Chains used for driving escalator treads shall have a factor of
safety of not less than ten when operating with the full capacity at maximum
speed, except when the chains are composed of cast steel links, which shall be
thoroughly annealed, in which case the factor of safety shall be not less than
20.
(2)
Existing
installations. Chains used for driving escalator treads shall be of
sufficient strength to carry the load without breakage or misplacement. When
such chains are in need of renewal, the new chains shall possess a safety
factor of not less than ten when the escalator is operating with full capacity
at maximum speed.
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