What is the required safety factor for DC cable insulation thickness?

The required safety factor for DC cable insulation thickness is established to ensure that the insulation can withstand potential stresses and electrical breakdowns over its operational life. A safety factor of 3 to 5 provides an adequate buffer against variables such as temperature fluctuations, mechanical wear, and electrical overloads which can occur in real-world conditions.

This range ensures that the insulation remains reliable under various operating conditions, reducing the risk of failure that could lead to short circuits or electrical hazards. A higher safety factor, like 5 to 7 or 7 to 10, may be suitable for specific applications or environments that demand even greater reliability and protection, but those are not the standard requirements for general use. Meanwhile, a lower safety factor of 1 to 2 would not provide enough assurance for safeguarding against insulation breakdown, making it unsuitable for typical applications.

In summary, the accepted range of 3 to 5 strikes a balance between adequate protection and practical design considerations in the use of DC cable insulation.