Bank Calculations

[e2me]

OK I came across a Bank Calculation on my test and now Im not sure if I got it right or not I will give you the exact wording and then my answer.After looking in Mike Holt exam prep book and Tom Henerys same I get 2 different answers and Not sure that mike is right so you decide.

What is the service calculated load for a 30,000 sq ft bank



my answer is 30,000x3.5x1.25= lights 131,250va
outlets as per 220.14k no # of so 1va X30,000 30,000va
total of 161,250va
or 16.1kva or 672Amps

Tom henery same answer but mike holts answer by 2005 exam prepbook unit 11 question 25 is 151,250va or 630 amps
seems Mike thinks you can apply the derates of 220.44 to receptical loads that are not figured by the 180 va required in 220.14I

So before I take my City Test I would like to know which is right .By the way I passed my State Exam with a 89% thanks to all who post here and answer my questions ,as well as others .It truely does help. Not only do I get answeres but other ideas from around the country as I relize my juristiction is not alwasy enforcing it the same as yours but good to see reasons they think different.:-?

 

[e2me]

I notice that no one wants to post a answer all though 21 have viewed
hey if Mike is wrong Mike is wrong .We all make mistakes just lets get the right answer out there please .I'm still unsure but i read my book as my answer is correct please show me I'm wrong

OK I came across a Bank Calculation on my test and now Im not sure if I got it right or not I will give you the exact wording and then my answer.After looking in Mike Holt exam prep book and Tom Henerys same I get 2 different answers and Not sure that mike is right so you decide.

What is the service calculated load for a 30,000 sq ft bank



my answer is 30,000x3.5x1.25= lights 131,250va
outlets as per 220.14k no # of so 1va X30,000 30,000va
total of 161,250va
or 16.1kva or 672Amps

Tom henery same answer but mike holts answer by 2005 exam prepbook unit 11 question 25 is 151,250va or 630 amps
seems Mike thinks you can apply the derates of 220.44 to receptical loads that are not figured by the 180 va required in 220.14I

So before I take my City Test I would like to know which is right .By the way I passed my State Exam with a 89% thanks to all who post here and answer my questions ,as well as others .It truely does help. Not only do I get answeres but other ideas from around the country as I relize my juristiction is not alwasy enforcing it the same as yours but good to see reasons they think different.:-?

 

[TAZMAN]

Bank Calculations

I agree with this method.

30,000 x 3.5 x 1.25 = 131,250 lighting
30,000 x 1 = 30,000 receptacles
Total = 161,250 / 240 = 672 amps
220.44 allows demand factor if receptacles were calculated using 220.14 (h) or (I) these were calculated using 220.14 (K) so I could not use these demand factors.

 

[FrancisDoody]

Unkown Number

Unkown Number

You do bank calculation the same as you do office calculations. If the number of receptacles is unknown then you add an extra 1 VA per square foot to the receptacle load. I had this wrong before and it took alot of time to find the correct formula.
Thanks,
Fran