Re: Breaker in circuit panel box keeps popping
Using an extension cord won't increase the load on the circuit. What it will do is increase the resistance, lowering the effective voltage & wattage of the heater (and thereby lower the amperage draw). Using an extension cord with a heater is a big no-no because the heavy load of the heater tends to be more than the extension cord is rated for; the cord itself may overheat and start a fire.
My advice to everyone: when the walls are open, install more wires & circuits than you think you'll need. You'll need them, and it's cheaper to install sooner than later.
Edit: a breaker may trip at around 125% of rating after a short period of time, but it will allow probably a 200% draw for a fraction of a second (to allow for motor loads starting up) and may trip at only 105% over a long period of time. Many breakers use both thermal and a magnetic trip; the thermal handles the long-term-slight-overload to protect from having too much on the circuit, and the magnetic handles the short-term-high-overload to protect from short circuits.
Last edited by Fencepost; 04-24-2009 at 02:58 AM.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.