range calculations

springriverrat01

New member
Location
Galena,KS.USA
I recently ran across a code ? that i can't get the same answer to it goes
20apartments@ 900 sq ft. 3va per sq ft lighting load and 11kw range in each
what is the total lighting and appliance load for each apt.
the correct answer is 11945 VA
how did they come to this answer
 

david luchini

Moderator
Staff member
Location
Connecticut
Occupation
Engineer
I recently ran across a code ? that i can't get the same answer to it goes
20apartments@ 900 sq ft. 3va per sq ft lighting load and 11kw range in each
what is the total lighting and appliance load for each apt.
the correct answer is 11945 VA
how did they come to this answer
3va/sf * 900sf ................= 2700va
2 S.A circuit @ 1500va ea = 3000va
Subtotal.........................= 5700va

From 220.42
First 3000va @ 100%......= 3000va
Remaining 2700va @ 35%= 945va
From 220.55
Range............................= 8000va
Total..............................= 11945va
 

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Electrical Contractor
3va/sf * 900sf ................= 2700va
2 S.A circuit @ 1500va ea = 3000va
Subtotal.........................= 5700va

From 220.42
First 3000va @ 100%......= 3000va
Remaining 2700va @ 35%= 945va
From 220.55
Range............................= 8000va
Total..............................= 11945va
I guess they assume a common laundry. I hate questions like that
 
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