Construction Coordinator Practice Exam

What factor is important for determining the total length of preassembled cable in a conduit?

1. Weather conditions

2. Thermal expansion/contraction allowance

3. Weight of the cable

4. Color coding of wiring

The correct answer is: Thermal expansion/contraction allowance

Choosing thermal expansion and contraction allowance as the important factor for determining the total length of preassembled cable in a conduit is essential because cables can expand or contract based on temperature changes. When cables are installed in a conduit, variations in temperature can cause the materials to change in size. If not accounted for, this thermal movement can lead to stress on the cables, potentially damaging them or affecting their performance. Incorporating this allowance ensures that there is enough length to accommodate any changes without putting strain on the connections or causing mechanical failures. This consideration is crucial in maintaining the integrity and functionality of the electrical system over its lifespan, particularly in environments where temperatures fluctuate significantly. Other factors, such as weather conditions, although relevant for installation practices, do not directly affect the calculated length of cable required in a conduit. Cable weight and color coding also play significant roles in installation and identification but do not influence the overall length of the cable needed in response to thermal dynamics.