Article 408 covers the requirements for switchboards and panelboards that control power and lighting circuits (Fig. 1). These rules address the equipment that forms the core of a premises electrical ...

Article 215 covers the installation, conductor sizing, and overcurrent protection requirements for feeder conductors not over 1,000VAC or 1,500VDC (Fig. 1). Fig. 1 ...

For utilities, proper protection against high voltage transient overvoltages and overloads is critical to ensure maximum life of their power transformers. Failure to do so can result in significant ...