M.shanmugam
Member
In industial application normally what is the diversity factor considered 0.5 or 0.65?
diversity factor
- Thread starter M.shanmugam
- Start date
- Status
- Location
- Mission Viejo, CA
- Occupation
- Professional Electrical Engineer
Re: diversity factor
For general industrial applications the NEC does not recognize diversity factors.
What it does recognize is ?Noncoincident? loads in Section 220.21 and the various motor exclusionary applications in Sections 430.24, 430.25, and 430.26 and with 440.6 [See 220.14]. It should be noted for the Article 430 and 440 computed loads, the ?loads? are to be calculated from the full associated Table values rather than nameplate data.[See 430.6(A)(1)]
Ultimately, this provides a design safety factor.
For general industrial applications the NEC does not recognize diversity factors.
What it does recognize is ?Noncoincident? loads in Section 220.21 and the various motor exclusionary applications in Sections 430.24, 430.25, and 430.26 and with 440.6 [See 220.14]. It should be noted for the Article 430 and 440 computed loads, the ?loads? are to be calculated from the full associated Table values rather than nameplate data.[See 430.6(A)(1)]
Ultimately, this provides a design safety factor.
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: diversity factor
I no longer have access to the electronic version of the NEC. But when I did, I believe I did a word search for the phrase "diversity factor." I believe it does not appear anywhere in the NEC. Someone may wish to check me on that statement. What does appear, a very few times, is the phrase "load diversity." That phrase is not defined in the NEC, and there is no reason to believe the two phrases have the same meaning.
May I ask how you are planning to use "diversity factor"?
I no longer have access to the electronic version of the NEC. But when I did, I believe I did a word search for the phrase "diversity factor." I believe it does not appear anywhere in the NEC. Someone may wish to check me on that statement. What does appear, a very few times, is the phrase "load diversity." That phrase is not defined in the NEC, and there is no reason to believe the two phrases have the same meaning.
May I ask how you are planning to use "diversity factor"?
charlie
Senior Member
- Location
- Indianapolis
Re: diversity factor
The only place the exact term "diversity factor" appears in the Code is in the footnote to Table 520.44.
The only place the exact term "diversity factor" appears in the Code is in the footnote to Table 520.44.
bphgravity
Senior Member
- Location
- Florida
Re: diversity factor
Table B.310.11 includes the term "Load Diversity". The note at the bottom of the table describes a load diversity of 50%.
Table B.310.11 includes the term "Load Diversity". The note at the bottom of the table describes a load diversity of 50%.
- Location
- Illinois
- Occupation
- retired electrician
Re: diversity factor
Bryan,
That table was in the code itself for one code cycle with an effective date three years in the future. It was moved to the annex the next cycle, mainly because no one could agree on what diversity really means or how to apply it.
Don
Bryan,
That table was in the code itself for one code cycle with an effective date three years in the future. It was moved to the annex the next cycle, mainly because no one could agree on what diversity really means or how to apply it.
Don
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: diversity factor
Thanks for looking that up. But take note that that footnote is not using the exact two-word phrase "diversity factor." Rather, it is using the three word phrase "load diversity factor." I read that as meaning the same thing as their two-word phrase "load diversity" means, and of course nobody knows what that means.
- Status