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    Scope of Application The NHJX series fire-resistant busbar trunking system is suitable for AC three-phase four-wire and three-phase five-wire power distribution systems with frequencies ranging from 50 to 60 Hz, rated voltages up to 660 V, and rated operating currents from 250 to 6300 A. The fire-resistant busbar trunking system boasts excellent insulation performance, enabling it to operate continuously under normal environmental conditions as well as withstand fire exposure for more than one hour. It can be used in high-rise buildings and critical facilities to replace fire-resistant cables for power transmission and distribution purposes.