Distribution panel board

[veraniumhydroxide]

Hi good day. Im a fresh graduate Electrical Engineer now working in an industrial plant. I am designing a distribution panel board but i am not so confident (since i am a fresh graduate) considering demand factor, load factor, etc. The load of this panel board are furnaces and heaters ranging from 7 kVA to 37 kVA. I would like to ask if how much demand factor should I use or maybe any good reference you can recommend to fully accomplish this design. Thank you.

 

[WA_Sparky]

Id check out NFPA 70 section 424. If youre using revit, skm, or easy power these demand factors are already hard programmed in as long as you have designated your loads properly as heating. Id stick with using 100% of name plate value and make sure your sizing OCPD and conductor to 125% per NEC.

 

[ron]

Article 220 of the NEC is how to do a load calculation

 

[electrofelon]

Generally you would use article 220 in the NEC. 220 will reference specific articles where you may find some more specific guidance but generally you wont find many "demand" or "load" factors. I dont see article 424 applying to the OP.

 

[veraniumhydroxide]

or can I make my own demand factor by how frequent and how they run simultaneously?

 

[electrofelon]

or can I make my own demand factor by how frequent and how they run simultaneously?

Generally no, however there is 220.60. Also there are a few clauses like that for specific equipment. For example see 630.31 for welders.

 

[veraniumhydroxide]

Id check out NFPA 70 section 424. If youre using revit, skm, or easy power these demand factors are already hard programmed in as long as you have designated your loads properly as heating. Id stick with using 100% of name plate value and make sure your sizing OCPD and conductor to 125% per NEC.

if I use those application, does those let me see the computation?