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That depends on your meaning. Are you talking about turning off the breaker when you screw in a new lightbulb or fluorescent tube? That isn't necessary, but it is a good idea to turn off the switch.

If you're talking about installing a new light fixture, yes, you should always turn off the breaker or remove the fuse. Many electricians, if they are sure of what they're doing, will simply make certain that the light switch is turned off.

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Q: Do you need to turn the power off at the box before installing a light?
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Power is not off . need to change when you change the light switch?

Yes, you need to turn off the power when you change (replace) a light switch, since at least one of the terminals on the switch will always have power if the circuit is energized at the panel.


Is it easy enough to change an electric light fixture that I can do it without hiring a contractor?

It can be dangerous my dad does it but you need to turn the power off.


What do you need to make a simple series circuit to light a bulb?

To make a simple series circuit to light a bulb, the simplest components are a power source (such as a battery); a switch (to turn the power on or off); the bulb (obviously !); and some wires to connect everything together.


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 calculate kvar of capacitor bank if you know only the kw?

Your question is rather vague. Are you asking how do you determine the reactive power of a capacitor bank necessary to improve the power factor of a load (in which case, is it a single-phase or a three-phase load), or are you asking how to convert a capacitor bank's capacitance into reactive power?If the former, then you need to know the reactive power of the load before power factor-improvement, and the resulting reactive power after power-factor improvement, and the difference between these two will tell you how much reactive power you need to add in the form of capacitors.

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Who can install a vanity light?

Most people can install an bathroom vanity light if the electrical box and light switch are already installed. You just need to make sure you turn of the power while you are installing the light and be certain that you are attaching the wires correctly. If you are not comfortable installing the light fixture on your own, or if you need to install the electrical box for mounting and the light switch, then you will need to contact a licensed electrician to install it for you.


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