If you notice any of these wood-chewing creatures, or signs of their activities, it’s important to deal with them immediately ...

Impulse relay turns on with an electrical impulse at the control input and turns off again with another impulse.

When we take a normal wall switch and turn it to the off position ... (See Figure 4, page 20.) This wiring diagram shows 120 V coming from L1 of a circuit breaker, through a switch, powering a boiler ...