chris68
Member
- Location
- Denver, CO
I have enrolled in a code review class. We were given the following question:
"Using the conventional calculation, determine the minimum size service conductors on a 240v, single family residence with the following load. 4000 square feet, a 12kw range 120/240v, disposer 6 amp 120v, dishwasher 9 amps 120v, trash compactor 10 amp 120v, hot water storage tank 4.5kw 240v. Note: include the required small appliance and laundry loads in your general lighting calculations."
I am the only one in class that added 5000va for a dryer...even though it's not specified in the question. Logic being, "no nameplate was given. 5000va is larger than zero va per 220.54.
Arguements have been provided as follows:
1. yeah, how about 220.82 (I ruled invalid because it's part of the optional feeder calculation)
2. How about something from 210.52F (I chose to ignore...seemed like it listed the required branch circuits, not the feeder calculations).
As far as I can tell, when you size a service for a single family dwelling...even if you aren't given any information about a dryer you should include at least 5000va in the standard feeder calcs.
I welcome your comments, I'm hoping to print this discussion and take it back to class with me on Thursday oct 5
"Using the conventional calculation, determine the minimum size service conductors on a 240v, single family residence with the following load. 4000 square feet, a 12kw range 120/240v, disposer 6 amp 120v, dishwasher 9 amps 120v, trash compactor 10 amp 120v, hot water storage tank 4.5kw 240v. Note: include the required small appliance and laundry loads in your general lighting calculations."
I am the only one in class that added 5000va for a dryer...even though it's not specified in the question. Logic being, "no nameplate was given. 5000va is larger than zero va per 220.54.
Arguements have been provided as follows:
1. yeah, how about 220.82 (I ruled invalid because it's part of the optional feeder calculation)
2. How about something from 210.52F (I chose to ignore...seemed like it listed the required branch circuits, not the feeder calculations).
As far as I can tell, when you size a service for a single family dwelling...even if you aren't given any information about a dryer you should include at least 5000va in the standard feeder calcs.
I welcome your comments, I'm hoping to print this discussion and take it back to class with me on Thursday oct 5
Last edited: