adjustment factor

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linwue

Member
Location
Minnesota
Occupation
Electrician
we have 4 parallel sets of 600kcmil in 4 inch emt.the question I have is do you have to adjust the ampere rating of the 600 kcmil wire since there are more than three current carrying conductors in the 4 inch emt. 480/277volt y system feeding non linear loads.
 

winnie

Senior Member
Location
Springfield, MA, USA
Occupation
Electric motor research
480/277volt y system feeding non linear loads.

What is the percentage of 'non-linear loads'? How many of these 'non-linear loads' are line to neutral? What percentage of these 'non-linear loads' have power factor correction?

With sufficient 'triplen' harmonic drawn by the loads, you can have significant neutral current, and the grounded conductor must be counted as a CCC. However these situations are the exception rather than the rule.

-Jon
 
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