Table B.310.1 - 7

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Raul600

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Just wanted to know why tables Table B.310.1 - 7 have different LF distances for RHO 60 90 120. Just trying to understand how to use these charts and B.310.1 interpolation chart.

Plus are these steps required if the circuits are 120volts?
 
These tables are about ampacity, and that has nothing to do with voltage. The LF values are not distances; they are values for "load factor." Unfortunately, the NEC does not define that phrase, so I find the tables difficult to use.

Welcome to the forum.
 
Check Annex B at the beginning of the tables. It gives some information regarding the tables. You might want Google Load Factor for more information.
 
Table B.310.1

Table B.310.1

Would the ampacity figures listed on table B.310.1 be the most amps a single wire could handle in this configuration?
Or is it the total amps of all the wires combined?
 
Ampacity is all about one wire at a time. And if you are talking about what I think you are talking about, the notion of combining amps on two or more wires to come up with a "total amps" is meaningless.
 
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