Lamps Controlled from Two Switches (Fig. 1)
The method of connecting a number of lamps to a circuit so that they can be controlled from either of two switches is shown in Fig. 1. The switches, as illustrated in this drawing, are in such a position that the lamps will burn. If either of the switches be thrown to its other position (there are two positions for each switch), the circuit will be opened. The operation then of either switch will again close the circuit.
Lamps Controlled by Any Number of Switches (Fig. 2)
The method of connecting a number of lamps to a circuit so that they can be controlled by any number of switches is shown in Fig. 2. The switches are all in such a position that the lamps will burn. If any one of the switches be turned to its second position (all the switches have two positions), the circuit will be open. The dotted lines at switch C show the connections through switch C after it has been operated. Operating switch D then will again close the circuit, by using the dotted lines in switches C and D. The wiring for the control of lamps, as just indicated, must comply with the underwriters' requirements, and also city requirements, if the work be done in a place having city regulations for electric wiring.
Wire netting may be cut by laying it on the side edge of a spade and striking it with a hammer.
