# Test question. General lighting load demand.

#### Cowest

##### Member
Hi, I have been struggling with this question.
A multi family building has a total general lighting load of 130kw. What is the calculated general lighting load?
Art 220.42 I have the answer from the back of the book of 45.94kw.
I can’t get this problem to work out.

#### charlie b

##### Moderator
Staff member
I can't get there either. I am highly suspicious of an answer that has two significant digits to the right of the decimal place. Starting with a number as high as 130kW, any of the demand factors I know how to use would give you results in whole numbers. I think the person who wrote that question has made an error.,

#### Cowest

##### Member
I can't get there either. I am highly suspicious of an answer that has two significant digits to the right of the decimal place. Starting with a number as high as 130kW, any of the demand factors I know how to use would give you results in whole numbers. I think the person who wrote that question has made an error.,
Agree.

Staff member

#### Cowest

##### Member
I got 46.75kw

3000x100%=3000w
120000x35%=42000w
7000x25%=1750w

3000+42000+1750=46.75kw

#### Joe Villani

##### Senior Member
Re-read table 220.42.
Is it really 120,000?
I tell my students to write in "next 117,00" on the 35% line to avoid that mistake.

#### Cowest

##### Member
Re-read table 220.42.
Is it really 120,000?
I tell my students to write in "next 117,00" on the 35% line to avoid that mistake.
Thank you all. 117,000 makes sense to me.This has to be the right way to do this problem. This was a practice test for WV electrical contractors. 46.45kw was not an answer that’s why I kept getting confused.

#### Little Bill

##### Moderator
Staff member
Re-read table 220.42.
Is it really 120,000?
I tell my students to write in "next 117,00" on the 35% line to avoid that mistake.
Where are you getting 11700 at?

#### Little Bill

##### Moderator
Staff member
From 3,001 to 120,000
I'm not seeing how you get to take 3000 from 120000. The load is 130000. you would take 3000 from that and get 127000. You take 35% of up to 120000 then the remaining 7000 at 25%.

#### Chamuit

##### Senior Member
Reread the table. (2017)
First 3000 at 100%
From 3001 to 120,000 at 35%
Remainder over 120,000 at 25%

So:
(3,000x1)+(117,000x.35)+(10,000X.25)=46450

Divide by 1,000 to get your k.