Absolutely not. #2awg conductors are only good for about 100 amps depending on Cu or al. see nec table 310-16.
I would have to say that the amperage label on the main breaker would designate the amount of amps coming into the house.>Look at the number on the handle of the main breaker. That number is the rating of the breaker and at what amperage the breaker will trip. If you have a main fuse switch the number on the fuse is the tripping amperage. This will be the amount of current that the service is rated at.
Simple. Your main electrical panel will have a "main breaker". This will be a two pole breaker, usually at the top of the panel. It will have a number on the breaker "handle" such as 150 or 200. This is the maximum number of amps your panel can supply. Most newer homes, 1975 and newer have a 200 amp service.
Yes>In Canada the answer is no. Triplex is an aerial rated set of conductors that are used to bring the voltage from the utilities pole to the service drop at the home. Triplex consists of two ungrounded conductors wrapped around a neutral steel supported conductor. These conductors can be used on higher current capacities due to the direct cooling of the conductors by the surrounding air. This is why you will see a service drop of number 6 conductors supplying a 100 amp service. For a three phase four wire system quadplex is used to make three phase connections to commercial and industrial services.
Ampacity must be derated depending on the number of conductors and the ambient temperature. In the Canadian Electrical Code Table 5C denotes derating for the number of conductors. 1-3 conductors = 100% load 4-6 conductors = 80% 7-24 conductors = 70% 25-42 conductors = 60% 43 or more conductors = 50%
What you are looking at is a two pole 100 amp breaker. Distribution panels in North America are designed to use 120/240 volts. Any two adjacent breakers will give you a 240 volt circuit and either leg to the neutral will give you 120 volts.On the main breaker of a panel the number stated on the breaker is the amount of amperage that the breaker will allow to pass before tripping regardless of which leg the current passes through.A 200 amp service will have a two pole main breaker with a rating stating its capacity of 200 amps.Wire size into the breaker will give you a good clue as 100 amp breakers will use a #3 conductor whereas a 200 amp breaker will be fed with a 3/0 conductor.
The question is one of protection of conductors (wires). A 30 amp breaker must have a #10 copper conductor or larger for adequate protection. A smaller wire (larger number) such as #12, is not protected by a 30 amp breaker. If the equipment you are powering only requires 20 amps, using a 30 amp breaker and #10 AWG wire is acceptable provided all other elements of the circuit are listed for 30 amp circuits.
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