DC cable insulation must provide a safety factor of how much?

The correct safety factor for DC cable insulation is 3 to 5. This range is crucial because it ensures that the insulation can withstand surges in voltage, potential environmental factors, and degradation over time without failing. A safety factor of 3 to 5 means that the insulation is designed to handle at least three to five times the voltage it is rated for in normal operational conditions. This is especially important in electrical applications where reliability and safety are paramount, such as in lineman work.

By using this safety factor, the insulation not only protects the cable from electrical breakdown but also contributes to the overall longevity and efficiency of the electrical systems. Insulation that falls below this safety factor might not adequately protect against unexpected voltage spikes, which can have serious consequences.