Are there any requirements regarding the gauge of the repeated grounding wire for temporary distribution boxes?
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Our factory’s temporary distribution boxes are required to have repeated grounding; repeated grounding is necessary for distribution boxes at all levels, from level 1 to level 3. Are there any standard specifications regarding the diameter of the wires used for repeated grounding?
In the TNS system, where the distribution boxes on-site are repeatedly grounded, only leakage current flows, and that current is in the milliampere range. It’s not possible to select the neutral and ground wires as in a three-phase five-wire power distribution system. In my opinion, in principle, copper wires with a diameter of at least 2.5 millimeters will suffice; some construction sites require wires with a diameter of 6 square millimeters for low-voltage applications, but this is actually unnecessary.
I think so; I can’t remember which standard it is, but it should be copper wire with a cross-sectional area of no less than 6 square millimeters
Protective grounding: grounding copper wire with a cross-sectional area of not less than 4 mm2. GB50065-2011 – Code for design of earthing in AC electrical installations, 8.2.1; GB50257-2014 – Code for construction and acceptance of electrical installations in explosive and fire-hazardous environments, 7.1.7; GB50169-2016 – Code for construction and acceptance of earthing systems in electrical installation projects, 4.1.7