BUS way Demand factor

[shaibu]

Could any one answer me the following?

(01) According to NEC what is the permissible demand factor that can be applied on single bus way. The loads are Dwellings loads
(02) What happened if the busway has reached the max demand factor that cab be applied even if the busway still serve couple of floors / sub main panels

 

[petersonra]

I don't believe there are any special "factors" you can apply to bus way that would give you any special leeway on ampacity sizing. The load calculation is what it is. You might be able to come up with something on the load calculation side of things.

 

[bob]

Could any one answer me the following?

(01) According to NEC what is the permissible demand factor that can be applied on single bus way. The loads are Dwellings loads
(02) What happened if the busway has reached the max demand factor that cab be applied even if the busway still serve couple of floors / sub main panels

The only thing you can do is use section 220 to caculate the load and use
the reduction factors in the tables. Example 220.54, 220.56, 220.55.

 

[charlie b]

The concept of "demand factor" only applies to the calculation of load. In other words, it is used to help you figure out how much ampacity the conductors must have. You don't apply a demand factor to the busway. Instead, you find out from the manufacturer how much ampacity the busway has.

 

[shaibu]

thanks all