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Subchapter 6.1. Passenger Tramway Safety Orders
Article 3. Reversible Aerial Tramways

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§3159. Design and Installation.

(a) Design and Installation of reversible aerial tramways shall comply with ANSI B77.1-1982 and 1986, 1988 addenda, Section 2.1 which is hereby incorporated by reference.

(b) Reversible aerial tramways shall be provided with two communication systems.

(1) Both systems shall provide two-way communication between the machine room, operator console room, loading and unloading stations and each car.

(2) Both systems shall be independent of the primary power source.

(3) Both systems shall be independent of each other.

(4) The communication systems shall be permanently installed except that the second system may be of the portable two-way radio type provided an attendant at each location is mandated to carry one.

(c) Braking systems, except track rope brakes, that depend on pressurized liquid, air or gas for application shall comply with the following:

(1) An approved visible and/or audible monitoring alarm system shall be provided to indicate to the operator that the pressurized system has failed;

(2) Activation of the monitoring alarm system shall cause another brake system to stop the lift;

(3) An interruption of electric power shall not affect the operation of the brake system;

(4) The pressurized lines shall be installed to preclude damage due to physical abuse, vibration, and weather conditions;

(5) All components of the brake system shall be designed in accordance with recognized engineering practices.

(d) Track Cable Retention.

(1) Towers shall be designed to keep the track cables in saddle profiles under the most adverse design conditions. These provisions shall include the retention of the track cables under the maximum wind conditions at which the tramway is to be operated. A complete analysis of the retention means shall be certified by a Qualified Engineer. The analysis shall include consideration of, but not limited to, the aerodynamics of the car, increasing the depth of the saddle profiles, the effect of loading in the car at loads of empty, twenty-five percent (25%), fifty percent (50%), seventy-five percent (75%), and fully loaded, and the effect of car speed in those areas critical to track cable movement over the saddles.

(2) Cable catchers shall be installed on all tower saddles to catch and hold the track cable in case of an outside deropement. The cable catchers shall be installed immediately below the saddle, but in no case shall they be more than three (3) times the cable diameter below the bottom of the saddle groove.

(3) Devices shall be installed on the towers which will stop the tramway in case of track cable deropement.

EXCEPTION TO SECTION 3159(d): Reversible aerial tramways installed before July 3, 1972.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. New article 3 heading, repealer and new section filed 3-23-93; operative 4-22-93 (Register 93, No. 13).

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