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  • Different than cable. Cable refers to two or more wires or conductors grouped together in a jacket.
  • Copper or tinned copper is the most common conductor in home wiring because it has minimum resistance at reasonable cost.
  • Wire is grouped by gauge number, running from 0000 to No. 40. The smaller the number, the thicker the wire. For home use, the most common gauges are between 10 and 20.
  • Larger wire carries more current. Forcing too much current through a wire will cause it to overheat and trip a breaker.
  • Wire is also characterized by letters that correspond to the insulation type and electrical capacity.
  • Grounding wire provides a path of least resistance from the frame or case of an appliance to the ground to guard against electric shocks. Both two- and three-conductor cables can carry grounding wires.

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