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An emergency light switch uses a relay. A relay has an 5 terminals. The firs two terminals are connected to a flowing current (current flows when there is a normal electricity) The next 3 terminals are the common, the normally on, and normally off.
One of the battery terminal is connected to the common, and the other one terminal of the battery is connected to one terminal of the light bulb(which has two terminals) then the other terminal of the light bulb is connected to the normally on terminal of the relay. When current flows to the first two mentioned terminals of the relay, the circuit of the battery and light is cut off or not connected. But when the current is off, this will switch on the normally-on terminal thus current will flow from the battery to the light bulb, that will shed light. ;) on an emergency situation.
note: The normally off is not use. And may be use for some purpose.
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How do you connect emergency light?
An emergency light is connected by attaching one set of wires to the buildings wiring and another to a built in battery. When the light detects the power has been cut, it will automatically switch over to its battery and turn on.
How do you connect an ON-OFF switch to control the light?
To control a light with a switch, the switch has to be connected in series with the light fixture.
Why dining room lights go on and off intermittently?
Check for loose wiring at the light itself and also at the light switch. There can also be a loose wire anywhere in the circuit supplying power to that light switch. Start at the light itself and work backwards in the circuit until you find the loose wire.
How do you install a new ventilation fan on a second light switch using the power from the existing light switch?
you probably can't, you need a neutral and a live wire to make a fan work. switches normally only have live wires.
How do you wire a motion security light from the box to the light?
You wire a security light like any other light. The sensor is generally part of the light and provides an "auxiliary" switch to detect movement and switch on the light, usually only after dark.The regular light switch for the security light should be left "on" at all times and labeled or enclosed to prevent being accidentally turned off. The sensor will not work, and the light will not go on, if the regular light switch it not on.Many modern units allow you to "lock" the motion sensor on by using the regular light switch to turn off the circuit and quickly turn it on again. This makes the light stay on until morning, when the photocell will turn it off and reset the lock, even without any motion detected.
