When sizing a feeder for the fixed appliance loads in dwelling units, a demand factor of 75 percent of the total nameplate ratings can be applied if there are _____ or more appliances fastened in place on the same feeder.

When sizing a feeder for the fixed appliance loads in dwelling units, a demand factor of 75 percent of the total nameplate ratings can be applied if there are _____ or more appliances fastened in place on the same feeder.

• A. Two
• B. Three
• C. Four
• D. Five

Answer: (C)

When calculating feeder load for fixed appliances, you use a demand factor to reflect that not every appliance will be drawing full power at the same time. If there are four or more fixed appliances fastened in place on the same feeder, the total nameplate ratings can be reduced to 75% for sizing the feeder. This acknowledges that simultaneous full-load operation is unlikely across multiple fixed appliances, so the feeder doesn’t need to be sized for the full sum of ratings. If there are fewer than four fixed appliances, you would use the full sum of their nameplate ratings. If there are five appliances, the four-or-more rule still applies, so you’d use 75% of the total.

When calculating feeder load for fixed appliances, you use a demand factor to reflect that not every appliance will be drawing full power at the same time. If there are four or more fixed appliances fastened in place on the same feeder, the total nameplate ratings can be reduced to 75% for sizing the feeder. This acknowledges that simultaneous full-load operation is unlikely across multiple fixed appliances, so the feeder doesn’t need to be sized for the full sum of ratings. If there are fewer than four fixed appliances, you would use the full sum of their nameplate ratings. If there are five appliances, the four-or-more rule still applies, so you’d use 75% of the total.