220.44 ?

[e2me]

OK Ive asked a similar question here before and got only one response.I will further my question with a larger area and see if I can get it clear in my head . When using 220.44 to apply demand factor derates to receptacles loads am I not correct when I say you can not apply them to loads that are not calculated by 180 VA per outlet as in H and I, or to be more frank you can not derate loads in J and K . unless you use 180 VA.

For instance if a question asked for the receptacle load for a 2000sq ft office
I would answer 2000 x 3.5 x 1.25 or 8750VA I cannot derate this further as 220.44 does not apply here.

And if this is so why do all of Mike Holts 2005 Masters exam prep questions have the derate in them. I have missed them time and time again because I don't derate when not 180va is this right or wrong. I need to know this the correct way and want advice now as to which is correct

 

[Dennis Alwon]

For instance if a question asked for the receptacle load for a 2000sq ft office
I would answer 2000 x 3.5 x 1.25 or 8750VA I cannot derate this further as 220.44 does not apply here.

I am not sure I follow and I am not sure why 220.44 would not apply. It appears it should apply and receptacles are figured at 180 VA. Table 220.12 is for general lighting load not receptacle loads.
At least this will get the post to the top.

 

[FrancisDoody]

I hope this helps

I hope this helps

Table 220.44 can only be used in a commercial calculation where the exact number of outlets are known. Computered at not more than 180 VA per strap.
Continuous as well as non-continuous usage will also be considered.
Example:
40 Receptacles X 180 X 100%= 7200 VA
15 Receptacles X 180 X 125%= 3375 VA
Total=10575 VA
10,000 X 100% = 10,000VA
575 X 50% = 288 VA
Demand load = 10288 VA

Otherwise they are just added to the lighting load and in certain applications Table 220.12 will be used to compute the demand load.

 

[FrancisDoody]

You stated;
For instance if a question asked for the receptacle load for a 2000sq ft office
I would answer 2000 x 3.5 x 1.25 or 8750VA I cannot derate this further as 220.44 does not apply here.

I agree with the answer and think you are totally correct.