(a) In future installations guide rails for both car and counterweight of all elevators shall be steel or hard wood.

(b) Guide rails shall be securely fastened and of such strength, design and spacing between supports so the guide rails shall not deflect more than three-fourths inch under normal operation. They shall withstand the application of the “safety” when stopping a fully loaded car.

(c) The guiding surfaces of the guide rails for elevators, except platform elevators, shall be finished smooth.

(d) Wood guides for crossheads shall have not less than two and one-half square inches of sectional area and the minimum dimension shall be not less than one and one-half inches. Counterweights for such cars shall have guides with not less than one and one-quarter inches minimum dimension.

(e) Wood guides for platform elevators shall have not less than four square inches sectional area and the minimum dimension shall be not less than one and seven-eighths inches.

(f) Counterweight guides for platform elevators shall have not less than one and one-half inches minimum dimension.

(g) Steel car guide rails shall weigh not less than six and one-half pounds per foot.