Remove the arc-fault breaker?
try_hard
16 years ago
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normel
16 years agoRelated Discussions
Arc Fault vs Ground Fault Circuit Breaker
Comments (8)The gfci function is actually pretty easy to create. Both conductors are passed through a single toroid pickup coil. If the currents are equal the toroid has no induced voltage (the magnetic fields cancel) and nothing happens. If the fields do NOT cancel a triac is used to open the circuit. The sensitivity is as simple as how many turns on the toroid the sense winding has. More turns, more sensitive (less current imbalance). AFCI devices look for the high frequency noise generated by an arc. It will be at a multiple of 60 Hz, so filtering is not that hard. You need to consider that an arc generates electrical noise form the frequency of the voltage to light (the arc itself). The noise twice a cycle as the arc starts and stops with the 60 Hz voltage. Sense the noise, turn off the circuit. AFCI devices are not required to be as sensitive to current imbalances GFCI devices. Arcs do not trip a CB since the current does not exceed the CB rating. An arc from a break in the hot line is going to the hot line. TThe load on the circuit limits the currents, but the arc produces very high temperatures. A fault is when the hot shorts to the neutral (or ground) and the current exceeds the CB rating. Breakers for residential use are thermal-magnetic. The thermal is from heating of a section of conductor in the CB. This allows brief overloads to pass without tripping the CB (like 'slo-blo fuses). A motor starting or heating elemt turning on are allowed to operate since the current falls quickly and fails to trip the thermal overload. The magnetic occurs for 200%+ current and results in a very fast operation. The higher the current the more magnetic force is generated and the faster the breaker opens. At very high overloads the breaker opens in just a few milliseconds. People are not very good conductors. You are very unlikely to ever pull enough current through your body to trip the breaker....See Morearc fault breaker trips
Comments (8)Thanks...I did kinda feel the can was the problem..however, I was able to open the circuit box and redid all the connectors, seemed the blk wire was loose, but that did not fix it. Could it be a faulty thermal protector? I guess I can cut that out of the circuit and wire nut it, as my next attempt. But I'm thinking a pinched wire and a fixture by fixture elimination process in the attic..it's a low hip roof and I think I'll just about fit..any other suggestions before I commit to that torture? Thanks in advance......See Morearc fault breaker not tripping when wires are burnt in bedroom
Comments (7)If the wire nuts were melted, the iron certainly isn't your problem. That particular junction that melted was creating heat - and lots of it. Not everything that creates heat will trip an AFCI - and your iron is a good example. The AFCI is measuring current wave forms and comparing it to "normal" waveforms (like turning on a light or plugging something into an outlet.) If the wave form exceeds the normal in speed and intensity, it trips the breaker. The thing that causes heat is a combination of current and resistance. That could be in the form of the resistance of air (as in an arc) or gunk. Or it could be from higher current flowing through a wire that wasn't designed to handle it (as in a bulb too big for a fixture.) Also, ACFI's break. Have they checked to see if it is actually working?...See Morearc fault breaker test button not working
Comments (1)No, the two functions are pretty independent....See Morejcw48
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