Mobile power and panel unit

A mobile power apparatus provides a temporary interface between an electrical power supply and an existing electrical system or subsystem of a building. One or more electrical panels are supported on a mobile frame that can be transported to and within the building. The electrical panels are configured to emulate the existing building panels, including a plurality of electrical overload components. The electrical panel is connected to a safety switch box mounted to the frame assembly which includes a fuse array and a master on-off switch. The safety switch box includes a power cable bundle configured for electrical connection to an output power cable of the electrical power supply, which can be the building electrical supply, an external power supply or a back-up or emergency generator.