If the AC electrical system ground is connected to the main ground inside the building or premises that have been defined, then the soil core is required for a wrapped wire and metal parts of the power with ground boriphan. For buildings that are separate from the electrical power supply must be used together with the main principles of the two main land or more per deposit together, using the works considered primarily single-core land "to achieve the same reference voltage. Main wiring scaling of soil, based on the size of the present President. The main Earth wiring must be sized no smaller than that given in tables 1.
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