Multiple Switching Operation applied to lights in a camp

Multiple Switching Operation is a system where the street light can be energized and de-energized (switch ON and OFF) from multiple location by simply a push button switch. Figure below (A)  illustrate the layout of the street lights (L1,L2,L3…Ln) which are installed in the street of camp M. By pressing any one of the push button switches P1,P2,P3,P4, and P5 installed in buildings A,B,C,D, and E respectively, one can switch On and OFF the street lights.

Multiple Switching Operation applied to lights in a camp

Control Circuit Operation

Figure below (B) illustrates the control circuit of a multiple switching operation. Encircled A and B maybe the power made of relay or contactors. Encircled C is the power contactor that will energized the street lights (L1,L2,L3…Ln) directly from the source.

Pressing any one of the five push button switches (P1,P2,P3,P4 and P5) will energized contactor A. For example, pressing the push button switch P3 which is at the Administrator building will cause the contactor A to be energize. Contact A (13-14) will maintained contactor A energize until the push button P3 is still being pressed. Contact A (11-12) opens so that it will not give contactor B a chance to be energize. Contact A (1-2) will close to energize contactor C.

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With contactor C energized, Contacts C(3-4) and C (5-6) will closed to energized the street lights (L1,L2,L3…Ln). Contacts C (1-2) will close to maintain contactor C continuously energized. Contact C (13-14) will closed but it cannot  energized contactor B even if the push button P3 is still being pressed because contact A (11-12) is presently open and if the push button P3 is still being pressed, it cannot be de-energize contactor A since contact A (13-14) is closed.

Releasing the push button P3 from being pressed will be de-energize contactor A. Contact A (13-14) will open but it will not serve as a purpose anymore. Contact A (11-12) is close again but it will not energize contactor B even if contactor C (13-14) is closed since none of the five push button are close anymore. Contact A (1-2) will open but it will not de-energize contactor C since contactor C (1-2) is maintain close condition and contact B (21-22) is closed. Therefore, contactor C remains energize as well as the street lights even if the push button P3 is release from being pressed.

Pressing again one of the five push button switches (P1,P2,P3,P4 and P5), say push buttonP5,will energized contactor B because contact C (13-14) is currently at closed condition. Contactor A cannot be energized because contacts C (11-12) is still held open With contactor B (21-22) will also open to de-energize contactor C. Contact C (1-2,3-4,4-5) will now open to de-energize the street lights (L1,L2,L3…Ln) Contact C (1-2) will open. Contact C (13-14) will also open but it will cannot de-energize contactor B while push button P5 is still being pressed, because B (11-12) is still held at open condition. At this condition, while push button is still being pressed, the street light will remain de-energize.

Releasing push button P5 will de-energize contactor B. Contact B (11-12) will close but it will not energize contactor A since none of the five push button are closed. Contacts B (13-14) will open and will not affect contactor B anymore. Contact B (21-2) will close but has no more effect in energizing contactor C since contact A (1-2) and C (1-2) are now at open condition. Thus, de-energizing of the street lights some to the final stage.

If  it is again desired to energize the street lights pressed again any one of the five push buttons.

Note:    There is no limit as to the desire number of the push button in the controlling the street lights. Unlimited number of push button can be added in the parallel with the five push button just discussed.




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