Conductors are used to provide a path for electricity. The metals used for conductors have a relatively low resistance, but they have enough resistance to cause a voltage drop when current passes through them. If the wires are overloaded, the voltage drop increases, causing a reduction in the efficiency of the circuit and an increase in the heat produced. Heating the conductors above their designed operating temperatures will cause the insulation to fail, and the heat generated can be sufficient to start a fire if flammable materials are close.

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