CET Traveling Cables & Wiring Methods

Question 1

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

Accepted Answer

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

Answer

To provide emergency braking support to the car

Answer

To balance the weight of the elevator car during travel

Answer

To transmit hydraulic pressure to the car platform

Question 2

Traveling cables used in elevator installations must be:

Accepted Answer

Listed specifically for elevator use and capable of withstanding repeated flexing

Answer

Standard THHN building wire bundled in flexible metallic conduit

Answer

Solid conductor wire rated at 600V minimum per NEC

Answer

Any UL-listed wire of sufficient gauge for the connected load

Question 3

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

Accepted Answer

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

Answer

The loop rests on the pit floor to provide maximum slack for movement

Answer

The loop is kept taut with no excess cable to prevent sway

Answer

The cable attaches directly to the pit floor for additional support

Question 4

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

Accepted Answer

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

Answer

With cable ties spaced every 12 inches along the cable run

Answer

Welded directly to the car sling frame for a permanent connection

Answer

With spring-loaded connectors that allow free movement in all directions

Question 5

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

Accepted Answer

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

Answer

Only the hoistway walls on both sides of the car

Answer

Only the counterweight and counterweight guide rails

Answer

Only the car guide rails and buffer springs

Question 6

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

Accepted Answer

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

Answer

At the lowest landing to minimize cable stress during high-speed travel

Answer

At the top of the hoistway to reduce the unsupported length of cable

Answer

At the machine room floor level for easy inspection access

Question 7

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

Accepted Answer

Exposed or damaged conductors, severe kinking, or cracked insulation

Answer

Minor surface discoloration from age and normal oxidation

Answer

Slight stiffness observed in cold ambient temperature conditions

Answer

Cable length providing 8 inches of excess loop at lowest landing