In a single phase circuit 120/240 volt there are 2 power legs that we'll call A phase and B phase. If there is a 10 amp 120 volt load on phase A then there is also a 10 amp load on the neutral. However if you add a 5 amp load onto phase B then the neutral load is only 5 amps because the neutral carries the difference if the 2. If you try to balance your loads between A phase and B phase then there is very little load on the neutral. However if you put all the load on one phase then the neutral carries the same amount of load and if the neutral is smaller it can overheat because it is not capable of carrying as many amps. In order for this to be an issue with 2/2/4 under you would have to have in excess of 60 amps on the neutral on a circuit designed to handle 100 amps. It is a pretty inconceivable idea to have accidentally happen. It would mean using every other breaker space for your 120 volt loads. It is more likely to happen with 15-30 amp loads.
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Today's Featured Article - Seeing an Old Friend - by Joe Evans. Dad had a concrete contracting business starting in 1960. One of his first pieces of equipment was a Ferguson TO-35 with a Davis loader. Dad replaced the TO-35 with a MF 202 Workbull, essentially an industrialized Ferguson 35 I am told. Dad bought the 202 new in 1962, and I recall quite clearly going to the dealer with him to sign for it.
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