Load calculation "I think"

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drwill

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I got a call from a general contractor who was using a different EC. Their blue prints and other forms were declined. This is to be a fitness club with 8 low bays 400 watts / 4.5 kw waterheater / 40 receptacles / 2 ac units with 15 Kw heat each / 2 vents for bathrooms and 2 recessed lights above showers.my question is to look at what he submitted and tell me where he got his numbers from and what he did right and what he did wrong.

3750 Sq ft geleral lighting load 11.25kw
9 120v equipment outlets 13.5 kw
2 120v bathvents 3.0 kw
1 120v sign circuit 1.5 kw
1 240v water heater 4.5 kw
=
33.75 kw
- 10.00 kw
=
23.75 kw
x .4
=
9.50 kw
+10.00 kw
=
19.50 kw
+ HVAC 30.00 kw
=
49.50 kw
120 / 208 / 3ph 24.75 = 118.00 amps

Thanks Dr Will confused master in texas
P.s I will show my work later.
 
Re: Load calculation "I think"

I don't understand any of the numbers you posted?

The receptacle loads need to be computed per 220.13. All the lighting is going to be continuous loads. What about show windws?


I would just toss out the what someone else did and work the calcs from scratch.
 
Re: Load calculation "I think"

Are you and he using 220.31? It appears that this is an optional calculation for a dwelling unit.
I believe that you should use the Standard Method, unless someone turned the health club into an apartment.
Jim T
 
Re: Load calculation "I think"

184 amps. That is if you turn the 40 outlets into 9 equipment outlets for some reason. He reached in his *ss for his numbers.

[ February 05, 2005, 07:14 PM: Message edited by: bradleyelectric ]
 
Re: Load calculation "I think"

Lighting load:

I get 2 va per square foot for a club. That gives 7500 va. I would call it a continuous load, like Bryan did and multiply it by 1.25 for 9375 va.


I would multiply the heating load by 1.25 also (it is also considered continuous).

It looks like they applied the receptacle demand factor (220.13) to the lighting load and the hot water heater(which is incorrect). They also used .4 instead of .5 for the load above 10KW.

I agree, that calculation is such a mess, you need to start from scratch.

Steve
 
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