Derating in larger conduit

Status
Not open for further replies.
Better question would be how did the NEC justify changing the table?

Massachessetes still uses the original NEC derating table, when the NEC made the derating more restrictive MA said no, we are not doing that.

You can still find the table MA uses in the annex B of the NEC.

Take a look at Table B.31O.15(B)(2)(11) Adjustment Factors for More Than Three Current-Carrying Conductors in a Raceway or Cable with Load Diversity
The table that now appears in B.310.15(B)(2)(11) was moved there because the CMP could not define or argee to the meaning of "with load diversity".
 
Better question would be how did the NEC justify changing the table?

Massachessetes still uses the original NEC derating table, when the NEC made the derating more restrictive MA said no, we are not doing that.

You can still find the table MA uses in the annex B of the NEC.

Take a look at Table B.31O.15(B)(2)(11) Adjustment Factors for More Than Three Current-Carrying Conductors in a Raceway or Cable with Load Diversity

My 2014 NEC only shows up to (10). where is this (11)?? and what year did the NEC change the table?
 
My 2014 NEC only shows up to (10). where is this (11)?? and what year did the NEC change the table?
Possible you maybe have an early print edition and corrections were made for later editions?

Here is what it looks like, if you have this table the mistake could be mislabeling, there is only 10 tables in my book, but there is no table number 4 so that makes number 11 the tenth table of this section.

 
Status
Not open for further replies.
Top