I want to run a new light switch, but dont know where to run a new electrical wire from. Does it have to be the main breaker box or can I attach to a wire close by?
Good morning dandrewsjr18,
Thanks for your question and welcome to the community!
The long and short of your wiring question is...it depends.
Depending on what you are wiring and where it will be. Planning will be the key to doing this successfully. If you are wiring a light switch via an existing circuit, you'll need to make sure that existing circuit is not going to be overloaded once the new switch is put in.
Check to see how and where this circuit is connected to other devices. Use a circuit tester or multimeter to track down if how many lights, receptacles, and any other devices you have on the circuit you want to run the new switch from.
If this is on a 15-amp circuit, you can safely add the light switch so much as long as the total circuit doesn't exceed 1440 watts. (15 amps x 120 volts x 80% of the total watts= 1440 watts)
If you have a 20-amp circuit, you can safely carry 1920 watts on the entire circuit without worrying about overloads.
To tally these numbers up, simply research the amount of lights, receptacles, and other devices on your circuit. Always refer to any local codes and consult an electrician in your area to make sure any other pertinent questions are answered that we can't tackle here.
Lastly, we carry a handy little book sold at our stores called Wiring 1-2-3. It is the easiest and one of the most helpful books we sell. Check it out next time you are in the store, it carries a lot of great information, like installing a new light switch...
It typically is a lot easier to tie off on an existing circuit than making a new dedicated one straight form the main panel. Just stick to the information above, and it can work out for you.
Hope this has assisted you, and let us know if you have any further questions,