What is NOT required by the National Electrical Code for motors?

The correct answer highlights that an individual laboratory listing or evaluation is not a requirement established by the National Electrical Code (NEC) for motors. The NEC focuses on safety and functionality in electrical installations, ensuring that systems are designed and installed to prevent hazards and promote safe usage.

While the NEC does require compliance with standards regarding efficiency, safety features, and performance, the individual evaluation or listing of motors by a laboratory is not explicitly mandated. This does not mean that all motors must be untested or unlabeled; rather, they can often meet general compliance through adherence to standards developed by recognized entities or organizations.

Energy efficiency labeling is a requirement in many contexts and is increasingly emphasized, especially as energy conservation becomes a priority in electrical systems. Protective covers for wiring ensure safety and protection against mechanical damage, another important aspect for motors. Insulation resistance testing is a standard procedure that helps prevent electrical failures by ensuring the integrity of insulation. All these components play a crucial role in ensuring safety, efficiency, and reliability, while individual laboratory listings are not universally enforced through the NEC for every motor type.