Which method is NOT used to guard bare live parts from public access according to the NEC?

Guarding bare live parts is a critical safety concern outlined in the National Electrical Code (NEC). The NEC provides specific methods to restrict access to live electrical components to prevent accidental contact, which can lead to electrocution or injury.

The method that is not recognized by the NEC for safeguarding bare live parts from public access is the use of security personnel. This method does not provide a physical barrier or protective measure for the electrical components. While security personnel may help in monitoring and restricting access, they do not create a tangible barrier that can physically protect individuals from coming into contact with exposed live parts.

On the other hand, enclosing bare live parts within a metal box effectively mitigates access by providing a solid physical barrier. Insulating with non-conductive materials offers another layer of protection by reducing the risk of accidental electrical contact. Similarly, using fireproof curtains may also serve as a safeguard, although this is less common than the other methods mentioned.

Overall, while security personnel can contribute to safety, they do not conform to the NEC’s criteria for permanent and reliable protection of electrical components.