motors...unsure

[Beverly]

When do we use 25% and 125% for residential load calculations. Where would I find 25% in the NEC...

 

[mcclary's electrical]

When do we use 25% and 125% for residential load calculations. Where would I find 25% in the NEC...

Not quite sure what you mean. Can you rephrase the question?

 

[Beverly]

motors...unsure

In residential load calculations: standard/optional method, would I add 25% or 125% to the FLA of the motor (disposal) for my load calculation....where in the NEC would I find 25%.

 

[bphgravity]

From a mathematical standpoint, you must increase the load by 25%. So, you could add 25%, or multiply by a factor of 125%.

10 + 25% = 12.5

10 x 125% = 12.5

See 220.18(A) and 220.50 for your specific question.

 

[ElecEngCons]

Typicall I have always sized breakers serving motors at 1.75 of the FLA due to inrush currents and wire sizes at 1.25 of the FLA....