tryinghard
Senior Member
- Location
- California
What is load diversity (310.15(B)(2) & FPN No.1)?
When would this be used rather than Table 310.15(B)(2)(a)?
When would this be used rather than Table 310.15(B)(2)(a)?
I had to back up to 2005, other one on the job.... thanks but I'm still wondering what constitutes/qualifies load diversity and when to use it instead of Table 310.15(B)(2)(a)?
It appears with your link that some circuits - that are limited and controlled as to not allow operation at the same time as others - may not have to be counted as CCC's?
iwire said:Unless you are an engineer you never use Table B.310.11. (or you live in MA )
See B.310.15(B)(1) at the start of Annex B.
cadpoint said:I had to back up to 2005, other one on the job.
How can you get by 310.15(B)(2)(a), last sentence.... "Each current carrying conductor of a parellel set of conductors shall be counted as a current carrying conductor."
So for example: (what I think your trying to do is)
Take five wires, of those a hot and a ground and the others are signal wires on a device. Your asking if you use 3 wires for your count in raceway fill but installing five?
Maybe ... :grin:
There are ways to apply this section. The examples are very easy to work out. But in my experience "use iwires "advice. I have seen many cases where it was used wrong and cost lot's of money to change.iwire said:Unless you are an engineer you never use Table B.310.11. (or you live in MA )
See B.310.15(B)(1) at the start of Annex B.
SEO said:There are ways to apply this section.
tryinghard said:Actually I was just trying to understand what "load diversity" is
tryinghard said:and when to apply it.
I don't see a reference to engineering supervision. Load diversity could be used where you have heating and cooling units and the heating and cooling could not be on at the same time. You may have a situation where you have several motors and have an interlock where not all the motors could run at the same time. By using the formula and examples under table B.310.11 in the annex it can be done. There has to be a way to ensure that not all conductors are loaded at the same time and then apply the adjustment factors. I still say be careful and stay away if possible.iwire said:Sure would like to hear how without 'engineering supervision'.
SEO said:I don't see a reference to engineering supervision.
Thanks iwire I knew I was going to get a response from you when I gave some examples in my post. I do agree with you.:smile:iwire said:Table B.310.11 (the one used that can be used with 'load diversity) is located in Annex B of the NEC.
The very first section of Annex B is B.310.15(B)(1) which explains the use of Annex B is reserved for installations under engineering supervision.