Electrical woes...breaker box what??

Myka · #1 04-30-2010, 10:25 PM

Bill, I know it is cheaper to add a sub panel than it is to upgrade the current one. I am told it would cost about $300 to get a sub panel put in.

#2 04-30-2010, 10:28 PM

Ya but will they change the mains to 100AMP? IF they can just change the Mains then that will cost next to nothing also.

Bill

Myka · #3 04-30-2010, 10:36 PM

I don't get it... do you mean the line from the street to the pole needs to be changed? I was under the impression that you can pull out the old 70 amp panel, put a 100 amp (or whatever) panel in, and voila. Not so? I thought it worked like an outlet does...you can draw whatever the panel itself is?

Oh.....one thing I just remembered...there are 3 or 4 other outlets on that same breaker too. The dehumidifier is on a different outlet, but same breaker. For some reason the whole bathroom is also on that breaker (can't blow dry hair when halides are on), and the kitchen's ceiling lights. It is a 20 amp breaker.

Electric eel · #4 04-30-2010, 11:24 PM

If you have space in the main panel (which it sounds like you do as you said there are 3 spaces empty) then go ahead hire an electrician to install 2 dedicated circuits from your main panel. At this time do not worry about the 70 amp main. If you have not tripped it then don't worry! Save your self the money (spend it on fish stuff!). If it does trip then it would be time to look at a new service and 100 amps would be plenty. Don't forget to install the GFI plugs!!!!! 1440 watts on a 15 amp circuit is correct.

James
Certified electrical contractor

Myka · #5 05-01-2010, 12:49 AM

Thanks for your reply James. We haven't tripped the main breaker, just the one the fish tank is on if I try to blow dry my hair on the same breaker.

That breaker is a 20 amp breaker, so would it be safe to assume I can have around 1900 watts on it at any given time? Is that all wall outlets combined on that breaker, or 1900 watts on each wall outlet of a 20 amp breaker?

reefermadness · #6 05-01-2010, 01:14 AM

watts are simply amps x volts. Usually you only want %80 continuous load on the circuit. So...20 x 120 = 2400 x .8 = 1920. So yes around 1900 watts is safe for a 20amp circuit.

If you are fine with the way the electrial works at the moment and just want the protection of a gfi at minimal cost you could just install the GFI recpticle where your fish tank is all plugged in.

banditpowdercoat · #7 05-01-2010, 01:35 AM

I would not run 20A(1900W) on that circuit though, without verifying that there is 12ga wire. 20A plugs are different than other plugs, one blade is sideways, and verticle. Alot of times, in older houses people will change a 15A breaker for a 20 because they were tripping the 15A. Theres a reason it was 15A for starters, because thats what the wire was rated for. If it's 14ga wire, and you run a 20A breaker, you can overload it and run the risk of an electrical fire...

But also, what was sead about adding the extra circuits is also true. As long as the main is not tripping. Even if all the slots are full, they make "piggyback" breakers that are 2 in the space of 1 so you can add more protected circuits.

If you upgrade the panel to 100A, the wire from the pole to the meter, and meter to panel will need to be upgraded as well.