scope:

This Practice describes the electrical requirements for design, manufacture, inspection, testing, and shipping of packaged equipment (also referred to as skid mounted equipment). Electrical systems for packaged equipment may include components such as electrical enclosures, motors, motor controllers, heaters and process heaters, relays, controls and control panels, control stations, pilot devices, indicating lights, transformers, wires, and conduits.

This Practice does not address requirements for motor control centers, switchracks, substations, power control centers or remote instrument enclosures.