Check the electrical load and ensure that the sensors do not exceed the 10 Amp maximum. Verify that boxes are installed at junction, splice, outlet, switch, and pull points. Power Distribution Unit (PDU) 1). Ensure that all labels and warning signs are legible. Internal Inspection Open. A 3 Phase Electrical Distribution Box is vital in managing high power demands in industrial setups, events, and commercial buildings. Check for proper IP/NEMA ratings and material quality. Practice good wiring: secure.