The JSU series power supplies are mounted on a 4 x 4” galvanized steel plate that can be screwed directly onto a 4 x 4” electrical junction box. Before securing the power supply to the junction box, proper wiring from the power supply to the AC supply must be made. Extra precaution should be taken to insure that the AC wiring is not pinched between the mounting plate and the junction box as this can result in an electrical short. With a simple two leads, connections to the AC mains can be conveniently made using two screw nuts. Since the power supply is double insulated, there is no need for an earth ground connection to the power supply. The 4 x 4” junction box serves as the wiring compartment to the AC connections of the power supply. A wiring compartment is necessary to meet UL’s safety standard UL60950. Local and national electrical codes must be followed for compliance.