service calcs for commercial building

[cousy2]

What are requirements for sizing?

 

[DHkorn]

Strange as it is their is no NEC watt p/foot for general office buildings. Maybe someone here can help explain why?

 

[LarryFine]

See NEC Art. 220.

 

[LarryFine]

Strange as it is their is no NEC watt p/foot for general office buildings. Maybe someone here can help explain why?

Wrong: Office buildings . . . 3-1⁄2 va/sq.ft.

 

[steve66]

Wrong: Office buildings . . . 3-1⁄2 va/sq.ft.

3-1/2 va/sq foot + 1 va/sq foot for receptacles + all other equipment + fudge factor + growth.

I'm sure others can add to this list

 

[jtester]

I've always questioned 1va/sq.ft. for office receptacles. That comes out to be less than 1 receptacle for a 100 square foot office. I usually put one on each wall, or about 360va after diversity.

It might match utility demand values, but I find it short when I start counting actual receptacles in an office building.

Jim T