I bought a home a year ago that was built in 66. I've since added 2
new circuits to the breaker box. I've noticed that at the top of the
box it says "amperes 150". The box's circuits total almost 210amps. is
the label of 150 amperes the max it's allowed? Am I over? Do I need a
new box? It was over 150 before I added the 2 20 amp circuits. I am
probably answering my own question...
do i run a fire risk leaving it like this, if it is over?
The box rating/breakers are total. All circuits in the box aren't at
(anywhere near) full capacity simultaneously so the total ratings of the
individual circuits can (and normally do) exceed the overall box rating.
_IF_ (the proverbial "big if") you had a total load that did exceed
the 150A, it would trip the main while each individual circuit could
still be under it's rated load and not trip. That's by design.
So, it's probably ok still in compliance unless you've added large
continuous loads like AC or resistance heaters. An additional lighting
or outlet circuit is not an issue if the work was done properly.
buffalo ny: not if you put your left hand in your pocket and use your
right hand to call an electrician to have a look. he'll measure your
loads and see any dampness hazards and recommend gfi's or arc faults
or whole house power surge devices. and tighten down the service
screws. and check your ground. and recommend any new service that you
might want or even need. since you asked, you know you're not happy
with your new circuits or the loads, so just call the guy.
Assuming that the "150 amperes" was referring to a single, main circuit
breaker, it's perfectly safe. If it's referring to the panel rating, and
there are multiple main disconnects in the box, you may have an issue
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.