JXF series products are suitable for power, lighting and loop power distribution control, monitoring and metering protection in 50Hz~60Hz, single-phase two-wire, three-phase three-wire, three-phase four-wire and three-phase five-wire systems with voltage below 500V. Product. For seamless consolidation, distribution, and management of power supply. Suitable for circuitry in homes, offices, commercial setups and. NO. To order such indoor box, a letter “R' is specified when ordering; to order the concealed box sized 250 x 200 x 140, the order number is JXF252014R. We will present the performance, safe operation methods, and technical parameters of JXF low-voltage distribution box 1.