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Fire comes on 2 lines, L, N. Check for the cause and fix it. Electrical system in a building material factory. Usually, the electrical system used in our home. Will use a voltage of 220 volts, which will have 2 wires: the line L (the wire with the rising light) and the neutron line N (the wire with no more light). When using a screwdriver, put the check light on the electric wire. Will have power only for Line L only.