§ 7.99. Sheaves and drums of hoisting chains and cables.
(a) When chains or cables are used for raising or lowering the cars of new power-operated sidewalk elevators, the sheaves or winding drums shall not be less than ten inches in diameter. The sheaves or winding drums of hand-operated sidewalk elevators shall be at least 10 inches in diameter when cables are used, but when chains are used a lesser diameter is permitted, if the sheaves are pocketed to receive the chains. Cable sizes shall be at least 3/8 inch in diameter. Sheaves or winding drums shall be equipped with substantial retaining flanges.
(b) Power-driven sidewalk elevators suspended from cables or chains shall be provided with approved rope-type car safeties. Such safeties shall be capable of stopping or holding the fully-loaded elevator car at any point of its travel.
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