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In North America the diagram will have a left and right supply rail. The rungs are between these rails in a horizontal position. Usually the voltage supply is on the left and return to source is on the right. The rung will consist of a switch in series with a lamp drawn from the left rail to the right rail. That's it.

In European countries the rails are top to bottom. The rungs are between these rails in a vertical position. Usually the voltage supply is on the top rail and the return to source is on the bottom rail. The rung will consist of a switch in series with a lamp drawn from the top rail to the bottom rail.

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12y ago

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