when figuring lighitng calculations for residential are you suppose to
use fixture max wattage or the type of lamp that will be installed.
You would do that for the branch circuits but for the calc for the residence it is figured in at 3 watts/ sq. ft.
That may be true but what is the likelihood that all these fixtures will be on at once? Residential service are figured based on the diversity of the loads that are present. That is why we have Table 310.15(B)(6) which allows us to use a smaller conductor in most cases than T. 310.16 would allow.I plan on putting 75w recessed cans all throughout the house MY lighting
dwelling calcu seems to be less that my actual installations of lighitng
That may be true but what is the likelihood that all these fixtures will be on at once? Residential service are figured based on the diversity of the loads that are present. That is why we have Table 310.15(B)(6) which allows us to use a smaller conductor in most cases than T. 310.16 would allow.
Dennis I am new at pulling permits for residential I normally do comm/indust
So what u r saying is that all that may be required is the the singlefamily
dwelling service calculation general lts/recp, small appli, laundry and fixed
appliances plus a/c thats it I may not have to show panel schedule or
load analysis
Well I have never been required to do a load calculation on a dwelling. I have done them but no one has ever asked for it. You need to read art. 220 but here is an online single family dwelling calculator. See if this helps
Here, rediential or commercial, you won't get power without a Load Letter:Well I have never been required to do a load calculation on a dwelling.
Won't do much good in my neck of the woods. Dominion is a natural gas supplier here :grin:Here, rediential or commercial, you won't get power without a Load Letter:
Of course, that refers to the circuit calc; for the premises load calc, the per-sq-ft allowance is all you need.To me the key word is ?maximum? if the lamp holder of luminaire is UL listed and labeled for example a 100W max you load calculation has to indicate the maximum wattage allowed ...