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#Intermediate switch circuit with Electrical drawing
#To turn on and off from more than two places
#Intermediate switch circuit with electrical drawing sinhala,#power electrical sinhala,#to turn on and off more than two places,#to illuminate the stairs of a multi-story building,#to illuminate a corridor with several access roads,#three phase motor,#dol,#timer,#solar system,#generator,#contactor,#two way switch circuit,#intermediate switch circuit,#main switch,#trip switch,#4 pole mccb,#4 pole trip switch,#push button,#double pole switch, #srilanka electrical, #england electrical