Traveling Cables & Wiring Methods Flashcards

What is the primary function of a traveling cable in an elevator system?

Answer: To carry electrical power and control signals between the fixed hoistway wiring and the moving car

The traveling cable provides the continuous electrical connection between stationary building wiring and the moving elevator car, carrying both power and control signals throughout the travel range.

Traveling cables used in elevator installations must be:

Answer: Listed specifically for elevator use and capable of withstanding repeated flexing

Elevator traveling cables must be specifically listed for this application due to the unique demands of continuous flexing, torsion, and hoistway environmental conditions that standard wire cannot withstand.

The traveling cable loop in the hoistway must be arranged so that when the car is at the lowest landing:

Answer: The loop bottom clears the pit floor and all other obstructions in the pit

The cable loop must never contact the pit floor or any other obstruction to prevent abrasion, pinching, and damage that would create electrical hazards and operational failures.

How must traveling cables be attached at the car and at the overhead support point?

Answer: With strain relief so that conductors are not subjected to tensile stress at terminations

Strain relief prevents mechanical tension from being transferred to the electrical connections, protecting conductors and terminals from fatigue failures caused by the cable's weight and motion.

Per ASME A17.1, traveling cables must maintain adequate clearance from:

Answer: All hoistway equipment, structural members, and moving components except at designated attachment points

Traveling cables must be routed to maintain clearance from all equipment and structures in the hoistway to prevent damage from abrasion, pinching, or entanglement during car movement.

The traveling cable loop transition point (where the cable changes from hanging down to running upward) should ideally be located:

Answer: Near the midpoint of the car's travel range to minimize cable movement and mechanical stress

Positioning the loop transition near mid-travel minimizes the total range of cable movement and reduces cumulative mechanical stress on conductors over the life of the installation.

During inspection of traveling cables, which condition requires immediate removal from service?

Answer: Exposed or damaged conductors, severe kinking, or cracked insulation

Damaged insulation, exposed conductors, or physical deformation create immediate shock hazards and unreliable electrical connections that must be corrected before the elevator is returned to service.