Using the 2026 code, in Article 120.53 is the fixed appliance loads information where 4 or more can be taken at 75%, except for the list of items that cannot be used for this. The question is on the Heat and the Air conditioning equipment. The sections state they cannot be used for the 4 or more, but what about the separate blower in a force air furnace and AC system. The blower is for both the heat and the AC and can also be used by itself. When used by itself, it is neither Heat or AC. So, I count it as a fixed appliance according to 120.53 and allow the derating if 4 or more appliances. If all agree that it cannot be used, what do I do with it? Add it to both the AC and Heat before comparing them for the largest load based on 120.6.
Any thoughts would be greatly appreciated.
Any thoughts would be greatly appreciated.