Pennsylvania Code
Title 34 - LABOR AND INDUSTRY
Part I - Department of Labor and Industry
Chapter 43 - TUNNEL CONSTRUCTION AND COMPRESSED AIR WORK
Subchapter A - TUNNEL CONSTRUCTION AND WORK IN COMPRESSED AIR
WORK IN COMPRESSED AIR-CAISSONS AND OTHER PLACES
Section 43.82 - Locks and shafting

(a) All caissons in which 15 or more men are employed shall have two locks, one of which shall be used as a man-lock. Man-locks and man shafting shall be in the charge of a man whose duty it shall be to operate the locks and shafting.

(b) Locks shall be so located that the distance between the bottom door and water level shall be at least 3 feet.

(c) All caissons more than 10 feet in diameter shall be provided with a separate man shafting, which shall be kept clear and in operating order at all times.

(d) All man shafting shall be lighted every 10 feet with a guarded incandescent lamp.

(e) All shafting used in pneumatic caissons shall be provided with ladders which shall be kept clear and in good condition at all times. The distance between the centers of the rungs of a ladder shall not exceed 12 inches and shall not vary more than one inch in any one piece of shafting. The length of the ladder rungs shall not be less than 12 inches. The rungs of the ladder shall in no case be less than 6 1/2 inches from the wall or other obstruction in the shafting or opening in which the ladder shall be used. Under no circumstances shall a ladder inclining backward from the vertical be installed. A suitable ladder shall be provided from the top of all locks to the surface.

(f) All outside caisson air locks shall be provided with a platform at least 42 inches wide, and provided with a guardrail 42 inches high.