I'm having a hard time getting my head around the example D4(a) in the 2008 or the 2011 code book.
When sizing the feeder conductors every time I go to figure the proper size conductor and refer to 215.2(A) (1) It says: the conductor size, before the application of any adjustment or correction factors, it shall have an allowable ampacity not less than the non-continuous load plus 125% of the continuous load.
It seems pretty clear to me or does it? It does not say anything about actual load, calculated load, real load, or computed load. It says the non-continuous plus 125% of the continuous load.
I have all the literature from Jim Pauley on the subject from 1995. James Stalcup's articles. In fact I think the example in the code book was from James Stalcup. I also have Mike Holt's articles. And I use Tom Henry"s calculation book plus all these gentleman's articles on continuous loads. I've been teaching the N.E.C. for the past 15 years. Often time's I seem to think I understand the proper sizing of these conductors and it seems real clear to me, then I think that can't be right.
Anyway, is it just me or should there be some informational notes on types of loads in sections: 210.19 (A) (1) Branch circuit conductors, 210.20 (A) Overcurrent Protection for Branch Circuits,
215.2 (A) (1) Feeder Conductors, and 215.3 Overcurrent Protection for Feeders?
Then of coarse I do the math for the adjustment and correction factors starting in the 90 degree column but when I'm done and explain that the total ampacity has to carry the ampacity of the actual load and not the calculated load in the 75 degree column it becomes so confusing.
Thanks for letting me vent. If anyone has a fairly easy explination for properly sizing conductors for non-continuous loads plus 125% of the continuous loads please let me know.:?
When sizing the feeder conductors every time I go to figure the proper size conductor and refer to 215.2(A) (1) It says: the conductor size, before the application of any adjustment or correction factors, it shall have an allowable ampacity not less than the non-continuous load plus 125% of the continuous load.
It seems pretty clear to me or does it? It does not say anything about actual load, calculated load, real load, or computed load. It says the non-continuous plus 125% of the continuous load.
I have all the literature from Jim Pauley on the subject from 1995. James Stalcup's articles. In fact I think the example in the code book was from James Stalcup. I also have Mike Holt's articles. And I use Tom Henry"s calculation book plus all these gentleman's articles on continuous loads. I've been teaching the N.E.C. for the past 15 years. Often time's I seem to think I understand the proper sizing of these conductors and it seems real clear to me, then I think that can't be right.
Anyway, is it just me or should there be some informational notes on types of loads in sections: 210.19 (A) (1) Branch circuit conductors, 210.20 (A) Overcurrent Protection for Branch Circuits,
215.2 (A) (1) Feeder Conductors, and 215.3 Overcurrent Protection for Feeders?
Then of coarse I do the math for the adjustment and correction factors starting in the 90 degree column but when I'm done and explain that the total ampacity has to carry the ampacity of the actual load and not the calculated load in the 75 degree column it becomes so confusing.
Thanks for letting me vent. If anyone has a fairly easy explination for properly sizing conductors for non-continuous loads plus 125% of the continuous loads please let me know.:?