Skilled Nursing Bedroom Load Calculations

[DW98]

I apply the general lighting demand factors for hospitals or motel rooms (NEC 2005 Table 220.42) to skilled nursing and assisted living bedroom units for lighting and receptacles.

The units have PTACS (5 kw) and 1500W Heat-Vent-Lites, but since there are not permanent cooking provisions, the above are not dwelling units.

I cannot find any allowances in article 220 of the NEC that allows a % demand reduction for these loads. In the past, I calculated these at 100% without any reduction based on the number of units. Is there a Code reference that allows diversity. Engineering judgement?

 

[Mr. Bill]

220.51: Fixed electric space heating. Fixed electric space heating loads shall be calculated at 100 percent of the total connected load. However, in no case shall a feeder or service load current rating be less than the rating of the largest branch circuit supplied.

Exception: ... AHJ may grant permission for feeder and service conductors to have an ampacity less than 100 percent,...

I didn't understand the rest of what you were asking.

 

[DW98]

I did come across 220.51 after I posted. It looks like I'll have to seek AHJ approval if I want to reduce the feeder size to the panelboard supplying the PTAC branch circuits.