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In reality houses and systems contain many circuits. Some of these circuits are straight series types as mentioned above. Others are parallel circuits, where two or more loads are supplied electricity by the same piece of wire. The mathematical analysis of all these circuits can become very complex. A way around this complexity is to use a standard wiring technique that is very effective in low voltage systems--The Bus.

A bus is a heavy set of wires used to carry current to other smaller wires which eventually feed the loads. The battery's energy can be distributed by two heavy wires (usually 2 or 4

gauge) that run the entire length of a building. Smaller 8 or 12 gauge wires are soldered to this bus to supply the individual loads. This structure is similar to the skeleton of a fish, a heavy spine with smaller bones attached to it. This technique allows low voltage energy to be distributed with a minimum loss. Ideally, each load should have its own individual feeder wires soldered to the bus. All feeder wiring lengths should be as short as possible. This technique also allows the use of standard wiring components like switches, plugs and sockets, which will not accept the huge diameter of 2 or 4 gauge wire.

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