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Autodesk
Autodesk
El estado se ha cambiado a: Gathering Support

Hi @oduday can you elaborate how you would calculate demand per phase?   

 

Making some assumptions to try to understand... and you can point to the error in my understanding:

 

As an example, if the connected receptacle load is

Phase A: 11kVA

Phase B: 10kVA

Phase C: 9kVA

Total: 30kVA

 

Referring to the OOTB demand factors (100% of the first 10KVA, 50% of the remaining), the resulting demand per phase would be:

Phase A: 10.5 kVA

Phase B: 10 kVA

Phase C: 9 kVA

Total: 29.5 kVA

 

However, looking at the panel in aggregate, the demand ends up being 20kVA (100% * 10kVA + 50% * 20kVA)... so the demand load and current is about 2/3 the connected vs. looking at the phases individually.  However, one can't simply take such a factor (the 2/3) and apply to each phase because someone could do this:

 

Phase A: 15kVA

Phase B: 15kVA

Phase C: 0 kVA

 

Resulting Demand:

Phase A: 12.5kVA

Phase B: 12.5kVA

Phase C: 0 kVA

Total: 25kVA

 

The above 2nd scenario likely bad design, and computing the load per phase isn't going to solve that for you.. but something else helping you see the total load balance per load classification might (?).

 

Perhaps it isn't receptacles primarily that you have concern about... whatever additional info/example you can provide can help us understand more about this request.