So, the switch S1, S2, S3, and S4 can individually control lamps L1, L2, 元, and L4 respectively.Ĭonsider the Master switch is ON, at this condition both the terminals of the SPDT switches have phase line. So only switches positioned to the live terminal (connected to direct phase line) will ON the lamp, where switches positioned to open terminal OFF the lamp. So, one terminal of the SPDT switch will always have a phase line and the other terminals will have a phase line only if the master switch is turned ON.Ĭonsider the master switch is OFF (MS1 – OFF), in this condition only one terminal of the SPDT switches has the phase line, and all the terminals connected to the master switch remain open. The common pole of each SPDT switches S1 to S4 are connected to the respective lamps L1 to L4, also the neutral line is distributed parallel to each lamp.ġ st terminal of each SPDT switch S1 to S4 is connected to the Phase line (L) and the other to the phase line through the Master switch (MS1). In the circuit, the Master switch (MS1) is an SPST switch and S1, S2, S3, S4 are SPDT switches.
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