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

The total length of preassembled cable in a conduit can be significantly influenced by the need for thermal expansion and contraction allowance. When cables are installed, they are subject to temperature changes throughout the year, which can cause the materials to expand when heated and contract when cooled. This movement needs to be accommodated to prevent stress on the cable, which could lead to damage or electrical malfunction.

When planning the installation, it is necessary to calculate and allow for this expansion and contraction so that the cables remain securely in place without undue tension or gaps. If the thermal expansion/contraction is not adequately accounted for, it could lead to issues such as cable strain, reduced lifespan, or even failure of the electrical system.

The other factors, while relevant to different aspects of installation, do not directly affect the calculation of the cable length in the same way. Temperature fluctuations pertain to the broader environmental conditions but do not quantify specific necessary allowances like thermal expansion/contraction does. Similarly, the type of soil and conduit material may affect installation techniques and overall durability but are not directly tied to the adjustments made for length variations due to temperature changes.