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Main reason is for safety. Another reason is because if there is a heavy load, you may blow the fuse.

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Q: Why should you always switch off a circuit before replacing a fuse?
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Will circuit breakers be damaged when installing dimmer switches?

No. Installing dimmers should have no affect on breakers. Be sure to turn the circuit off before doing this project.As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.Before you do any work yourself,on electrical circuits, equipment or appliances,always use a test meter to ensure the circuit is, in fact, de-energized.IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.


What should you do if your circuit breaker is hot?

You should check that you are not running too many appliances on the circuit that is protected by the circuit breaker.If you are absolutely sure that the circuit is not being overloaded, you should replace the breaker with a new identical breaker. Breakers get hot when they supply power at near peak amperage over a long period of time and begin to break down internally.As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.Before you do any work yourself,on electrical circuits, equipment or appliances,always use a test meter to ensure the circuit is, in fact, de-energized.IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.


Does the current still flow when the circuit has blown?

If everything is working as it should then no current flows when the breaker is off. This is no better example of this than there is on answers. When a do it yourselfer looks for an answer and gets one, the answer is always ended with the suggestion that before doing any work always shut off the breaker. If the breaker is malfunctioning one symptom is that a voltage is still present even though the handle is in the off position. If this is the case change the breaker out immediately.


Can you wire a stove using a neutral from a lighting circuit?

for USA, Canada and other countries running a 60 Hz supply service.No. On an existing installation, when replacing an appliance, you can continue to use the existing three wire circuit to feed the new stove or dryer.Another answerNo way can the neutral from a lighting circuit be used for a stove!Lighting circuits must only be used for lighting. Check your national electrical code and/or wiring regulations.For more information see the answers to the Related Questions shown below.As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.Before you do any work yourself,on electrical circuits, equipment or appliances,always use a test meter to ensure the circuit is, in fact, de-energized.IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.


How can you work safely with electricity at home?

The safest way to work with electricity in any place is to de-energize the circuit and test with a meter or hot stick. We prefer meters because hot sticks are very unreliable and sometimes to sensitive. Always test a meter or hot stick on a known live circuit before relying on it. Even if you are 100% positive the circuit is de-energize you should pretend its not and respect it. Electricity can kill you, regardless of the voltage or amps. Any voltage or amperage can kill! If your not a pro, call one!

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Why conductors in circuit are covered with insulators and why insulators should be always kept dry?

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Why conductors in circuit are covered with insulators and why insulators should always be kept dry?

So that it's nice!