How To Figure Amps On A Circuit? - Electrical - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum how to figure amps on a circuit?

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01-22-2010, 01:31 AM   #1
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## how to figure amps on a circuit?

I have a friend who has a breaker that keeps tripping in his home panel. I dont have a clamp on meter. How do you figure out how many amps are on the circuit?

 01-22-2010, 05:47 AM #2 Newbie   Join Date: Dec 2009 Posts: 1 Rewards Points: 10 buy a clamp on meter?

 01-22-2010, 06:21 AM #3 Member   Join Date: Aug 2009 Location: Maryland Posts: 61 Rewards Points: 75 Without a clamp-on ammeter, you might try sequentially disconnecting or turning off and on items served by that breaker and observing the breaker action. That way you can compute the load.

 01-22-2010, 10:00 AM #4 Electrical Contractor     Join Date: Jun 2004 Location: Newnan GA Posts: 8,150 Rewards Points: 946 without a meter you can only guess. What size and type of breaker? Could be a gcfi that is tripping on ground fault and not over current. The same with a AFCI breaker. Need more details! __________________ Yes I am a pirate, two hundred years too late The cannons don't thunder, there's nothing to plunder I'm an over-forty victim of fate.
 01-22-2010, 10:02 AM #5 Member   Join Date: Nov 2007 Location: Nashua, NH, USA Posts: 8,597 Rewards Points: 2,800 Add up the watts of the things plugged in and turned on for that circuit and divide by 120 (by the volts). Is it only when something that uses a lot of electricity, such as a hair dryer, is turned on? Sometimes one circuit serves two or three rooms so you might be surprised how many items you find are drawing power from that circuit. __________________ Stick to your lawn watering schedule until it really starts to pour. After the storm you have only the same number of rest days you always had and then you need to start watering again. Last edited by AllanJ; 01-22-2010 at 10:05 AM.
 01-22-2010, 12:11 PM #6 Member   Join Date: Sep 2008 Location: Oregon Posts: 1,497 Rewards Points: 500 Yes, turn off the breaker, then see what no longer works. List each item and write down the watts in one column if it says watts on the appliance or amps in another column if it says amps on the appliance label. Then total the watts. Total the amps. Here you can convert watts to amps under "single phase"... http://www.jobsite-generators.com/po...lculators.html Then add the amps converted from the watts column to the other amps total. And you have the total amps being used. To solve the problem, you can move some of these to another circuit. Or run a new circuit to one big power user. Then you just need to install one outlet.

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