Continuous load * 1.25

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Hameedulla-Ekhlas

Hameedulla-Ekhlas

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Hope you all are fine.
I was teaching someone how to size breaker and cable for a project. When I reached to continues and noncontinues load and i told him that we multiply continues load by 1.25 according to NEC artical.

Suddenly, I was asked what is the main reason to multiply 1.25. I could tell him the reason and asked him wait I will find this answer.

Would you please advise me what is the main reason that we apply 1.25 to continues load.
 
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It is to effectively apply a conductor somewhat larger that otherwise needed to act as a heatsink for the overcurrent device. The heat buildup from the constant load can then be dissipated enough to reduce unnecessary operation (opening) of the OCP.
 
Volta said:
It is to effectively apply a conductor somewhat larger that otherwise needed to act as a heatsink for the overcurrent device. The heat buildup from the constant load can then be dissipated enough to reduce unnecessary operation (opening) of the OCP.
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Exactly what I was going to say but couldnt get the words to come out correctly. But as to why only a 25% increase to get that would have to do with testing.
 
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