What safety measure is required for service entrance conductors?

The requirement for service entrance conductors primarily focuses on their ability to ensure safety and reliability in an electrical system. Insulation is crucial as it not only protects the conductors from physical damage but also prevents electrical faults that could lead to short circuits or fire hazards. Insulated conductors help to minimize the risk of accidental contact with conductive materials or surfaces, which can be dangerous in situations where the conductors are exposed.

While grounding is a necessary measure for overall system protection, it specifically pertains to creating a path for fault currents and does not inherently provide the level of protection against physical damage or contact that insulation does. The placement of conductors underground or the use of armored conductors are also specialized practices that may not be universally required for all installations, depending on local codes and environmental conditions. Therefore, ensuring that service entrance conductors are insulated is a fundamental measure outlined in the NEC to enhance safety in electrical installations.