All motor metal casing must be connected to the protective zero line, the total distribution box and all sub-distribution box must be done to repeat the grounding, large-scale machinery must also be done to repeat the grounding, grounding rod length of 2 meters, spacing of 2.5 meters, for the ring connection, the joints should be fixed securely, the grounding line is always yellow, green two-color line, shall not be used in any other color as a grounding line, the insulation resistance of the line should be tested regularly, and make a good record.
From the above provisions, we know that the length of the temporary power grounding rod is 2 meters.