i have two lighting circuits that are controlled by a two pole contactor which in turn is controlled by a time clock.i also have a 20amp breaker which is to be the control circuit.what controls the time clock the control circuit breaker or the lighting circuit rcds.ive built the board but just need some conformation.
Ideally the same breaker the controls the clock should control the lights. Separate breakers are a tad more difficult to troubleshoot. With separate breakers, if one circuit is turned off or trips, the lights will not work (or will be on all the time if the clock was stopped in the on position).
Most contactors do not require that the controlling current and the controlled (switched)_ subcircuits come from the same breaker.
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Lighting contactors are used when the lighting load exceeds the current rating of standard snap switches or you just have alot of lights. Of course you already know this, as you are building the control board.
The time clock requires 24-7-365 power for the timer motor. The contactor is used to switch the lighting load and nothing more. Since this is a control circuit, you can get as creative as you want.
Power the clock and let the clock turn on the contactor. You did not mention the lighting load requirement. Whats the current.
You can use power from one of the lighting circuits to control the contactor and clock or you can use another source. It does not matter.