RE: 25% Largest Motor(new post)
Thankyou for your replies. I am going to be even more specific in this post without giving too much away and angering the testing gods.
On the major calc. portion of the Admin.'s exam (02), I consistently get 2 of 4 wrong (tested 3 times now). I am most nearly certain that my answers to the optional calc problems are correct and that my problem lies in the standard calcs. if I change my calcs to exclude the 25% of the largest motor (in both problems this refers to "room a/c"), thereby dropping the final calc by 5 amps , in one case, and 2 amps in another, in both cases this is enough of a change to give me a differnt answer choice on the test.
I spoke to an inspector at L&I who claims responsilblity for writing the larger portion of the test questions, and in the same conversation he put me off "Independent" authors and their methods for load calculating, and told me not to worry about the 25% on the a/c, AND, referred me to the Annex D Examples as the sole source of my determination method for how to calculate loads.
I find the examples lacking in their variety and in addition the D1(b) example not only takes room a/c into account for the 25% factor, it also uses two motors instead of one for the 25% factor(admittedly these are on seperate sides of the single phase lines and I can see why, in balancing the load, they did this, but it seems to break code protocol. P.S.-This load balancing equation method only applies to SFD's and makes no sense in identical multi-unit buildings,as on the test questions). In following the letter of the code (2002), starting from 220.14, the only reference to the additional 25% is in 430.24(this is also the reference that is given by the annex D example) (PLEASE NOTE: this question refers to service/feeders, not to branch circuits, which have different percentage rules), but to continue with the question of Hermetic Motors, and Mutimotor/combo-load equipt., as well as cord and plug connected equipt.(as referenced by 440.22(B)-Exception 2),the issue is confused by the fact that there is no instance where hermetic motors are assigned an added 25%(that I can find), unless they are discounted as hermetic, and let to fall back under the jurisdiction of 430 (not 440).
Thoughts? Anyone NOT factor in the 25%, and pass the test?
I may be left with challenging L&I with interpretation, but they've told me my odds aren't good.
[ November 02, 2005, 04:30 PM: Message edited by: TSET ]
Thankyou for your replies. I am going to be even more specific in this post without giving too much away and angering the testing gods.
On the major calc. portion of the Admin.'s exam (02), I consistently get 2 of 4 wrong (tested 3 times now). I am most nearly certain that my answers to the optional calc problems are correct and that my problem lies in the standard calcs. if I change my calcs to exclude the 25% of the largest motor (in both problems this refers to "room a/c"), thereby dropping the final calc by 5 amps , in one case, and 2 amps in another, in both cases this is enough of a change to give me a differnt answer choice on the test.
I spoke to an inspector at L&I who claims responsilblity for writing the larger portion of the test questions, and in the same conversation he put me off "Independent" authors and their methods for load calculating, and told me not to worry about the 25% on the a/c, AND, referred me to the Annex D Examples as the sole source of my determination method for how to calculate loads.
I find the examples lacking in their variety and in addition the D1(b) example not only takes room a/c into account for the 25% factor, it also uses two motors instead of one for the 25% factor(admittedly these are on seperate sides of the single phase lines and I can see why, in balancing the load, they did this, but it seems to break code protocol. P.S.-This load balancing equation method only applies to SFD's and makes no sense in identical multi-unit buildings,as on the test questions). In following the letter of the code (2002), starting from 220.14, the only reference to the additional 25% is in 430.24(this is also the reference that is given by the annex D example) (PLEASE NOTE: this question refers to service/feeders, not to branch circuits, which have different percentage rules), but to continue with the question of Hermetic Motors, and Mutimotor/combo-load equipt., as well as cord and plug connected equipt.(as referenced by 440.22(B)-Exception 2),the issue is confused by the fact that there is no instance where hermetic motors are assigned an added 25%(that I can find), unless they are discounted as hermetic, and let to fall back under the jurisdiction of 430 (not 440).
Thoughts? Anyone NOT factor in the 25%, and pass the test?
I may be left with challenging L&I with interpretation, but they've told me my odds aren't good.
[ November 02, 2005, 04:30 PM: Message edited by: TSET ]
