shespuzzling
Member
- Location
- new york
620.14 states that a demand factor can be applied to a SINGLE FEEDER based on the quantity of elevators it serves. What about if you have a feeder serving a distribution board, and that distribution board feeds 2 other boards, each with elevators on it? Here's an example:
Each elevator board serves 4 elevators, 10A each. The load on that board is (1.25*10 + 3*10)=42.5. Based on 620.14 we can apply a 0.85 demand so the total calculated load on each board is 0.85*42.5=36.125A
What would be the load on the main feeder serving the 2 distribution board? Would it be 36.125A + 36.125A = 72.25A? Or could we now look at that feeder as supplying a total of 8 elevators. So then the calculated load would be:
1.25*10 + 7*10 = 82.5
Demand factor for 8 elevators is 0.75 so calculated load on the main feeder is:
0.75*82.5=61.875
Appreciate the feedback.
Each elevator board serves 4 elevators, 10A each. The load on that board is (1.25*10 + 3*10)=42.5. Based on 620.14 we can apply a 0.85 demand so the total calculated load on each board is 0.85*42.5=36.125A
What would be the load on the main feeder serving the 2 distribution board? Would it be 36.125A + 36.125A = 72.25A? Or could we now look at that feeder as supplying a total of 8 elevators. So then the calculated load would be:
1.25*10 + 7*10 = 82.5
Demand factor for 8 elevators is 0.75 so calculated load on the main feeder is:
0.75*82.5=61.875
Appreciate the feedback.