[AMRadio] #4 wire from mains? - they gotta be kidding

Larry Will lhwill at verizon.net
Wed May 9 19:49:22 EDT 2007

I've been reading the Gates BC-1T manual and found two instances where
 > they state that #4 wire should be used.


There are two considerations for wire size. See NEC Code books

The first is ampacity - the current carrying requirement.

The second is voltage drop - the length of the run.

At Gates they had no idea what the branch circuit wire run distance 
is so they made a specification that probably could apply to worst case.

The rule is the max voltage drop on a branch circuit (mains box to 
load) should never be more than 5% and probably you would like less.



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