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Look at the faceplate. There should be a 75˚C or 60˚C rating bsed on the temperature rating of the terminals. You have to use the lowest rating shown, ie, if you use 90˚C cable with a 75˚C termination, you have to derate the cable ampacity to a 75˚C.
An example is look at 310.15(B)(16) in the 2011 NEC.
500kcmil cable is good for 430A in this table at 90˚C, if you had to derate to 75˚C, you loose 50 Amps and derate to 380A.
What else can I help you with?
How do you decide the rating of a switch for wiring?
Switch rating should match or be greater than the rating for the protecting breaker.
Can you use a 20 amp breaker if the amp rating on a heater is 21 amp?
No, a breaker needs to be loaded less than 80 percent. As they reach their tripping point they get hot. The circuit rating, breaker and wiring is not designed for 21 amps. The next size would be a 25 to 30 amp breaker that has #10 wire feeding it.
How much current flows through circuit breaker trip coil?
The trip coil has the whole circuit load amperage flowing through it. Thepurpose of the breaker is to only allow current up to its trip point. That is the only way that the breaker can sense if the current is within the limit rating. If the circuit load amperage becomes greater that the breaker rating it will trip. The trip coil that you refer to is a magnetic trip which senses the magnetic field that surrounds the wire. Breakers also have a thermal trip which senses a heat build up on the current flowing through it. If the breaker is in a high ambient temperature it will lower the rating on the breaker.
Can you install a 2 20 breaker into a breaker box that has space but all other breakers add up to more amps than the 200 amp main breaker?
No, you cannot install a 2x20 amp breaker if the total amperage of all the breakers exceeds the main breaker rating, as this would overload the system. The total amperage of the breakers should not exceed the main breaker rating to ensure safe operation of the electrical system.
Which terminal on a 15 amp household breaker does the hot wire feed into and which one does it come out?
On a 15 amp household breaker there is no terminal on the in feed of the breaker. The breaker either plugs into the distribution panel's bus bar or it bolts to the distribution's bus bars. The feed conductor connects to the load side of the breaker at its terminal lug.
What does 40 C mean on a circuit breaker?
Answer"40 C" means 40 degrees CENTIGRADE temperature rating.The breaker is rated to warm up to this temperature while in use without risk of fire or breakdown. It should not be used in such a way that it exceeds that temperature.Note that wires connected to the breaker must have an equal or higher temperature rating of its insulation. However, when the wire insulation rating is greater than the breaker rating, the wire's capacity must be determined using the breaker's lower temperature rating.For example:If the breaker is 400C and the wire is 400C, the wire capacity would be based on 400CIf the breaker is 400C and the wire is 600C, the wire capacity would be based on 400CIf the breaker is 600C and the wire is 900C, the wire capacity would be based on 600CI don't believe this to be true... The breaker is tested to and calibrated at the 40c rating. (This has more to do with ambient temp. than the way the breaker is being used) In a case where the temp. may exceed this rating you may trip before seeing the current the breaker is rated. The wire is typically rated @ 75c & 90c and the connection point on the breaker or the lug would be rated @ 60cThe above paragraph is correct It is the ambient rating of the breaker calibrated to trip at that temperature set point. In cold climates this has to be watched very closely. On a -20 C day, on breakers that are exposed to the elements, a breaker on the overload portion of the tripping mechanism may not trip until the current reaches one and a half times the handle rating.
Can a200 amp breaker lug handle a?
Handle a "What"?
Can a circuit breaker defect result in the breaker tripping under normal loads?
Yes, also a higher than normal ambient temperature can also de rate the breaker and allow it to trip at less current that its nameplate rating.
What information should be included on circuit breaker labels?
Circuit breaker labels should include the voltage rating, current rating, type of circuit, and the location of the circuit breaker.
What is the maximum current rating for the circuit breaker, rated at 150 amps?
The maximum current rating for the circuit breaker is 150 amps.
What is the purpose of a double lug breaker and how does it function in an electrical circuit?
A double lug breaker is used to connect two separate electrical circuits to a single breaker. It functions by allowing both circuits to be controlled by the same breaker, providing a convenient way to manage multiple circuits with limited space in an electrical panel.
Will a circuit breaker give off less amperage?
A circuit breaker does not give off amperage. A circuit breaker allows a flow of current up to the rating of the breaker. Any current higher than that of the breaker's rating will open the breaker's contacts and stop the flow of current.
What is the maximum amperage rating of the 125 amp Homeline breaker?
The maximum amperage rating of the 125 amp Homeline breaker is 125 amps.
What is the maximum current rating for a 15 amp circuit breaker?
The maximum current rating for a 15 amp circuit breaker is 15 amps.
What is the maximum current rating for a 20 amp Murray breaker?
The maximum current rating for a 20 amp Murray breaker is 20 amps.
What is the maximum voltage rating for a 120/240 VAC breaker?
The maximum voltage rating for a 120/240 VAC breaker is 240 volts.
What is the maximum amperage rating for a double breaker 20 amp?
The maximum amperage rating for a double breaker 20 amp is 20 amps.
