Ragin Cajun
Senior Member
- Location
- Upstate S.C.
We have been doing the engineering on several fast food restaurants. Jobs have been both new and upgrades.
Haven't had one restaurant that had a utility transformer larger than 150KVA, or ~420A rated load.
Haven't had one restaurant that had one year max demand larger than 123 KVA based on utility billing records and 15 minute max demand for an all electric building. That's even after the upgrades!
Yet the NEC calc's call for at least a 1000A service. Seems kinda crazy when you have a transformer good for only 420A that very adequately handles the load!
The 2005 handbook says that the "new" calcs were based on a study of actual restaurants.
The NEC's demand numbers are WAY off!
What am I missing here?!
RC
Haven't had one restaurant that had a utility transformer larger than 150KVA, or ~420A rated load.
Haven't had one restaurant that had one year max demand larger than 123 KVA based on utility billing records and 15 minute max demand for an all electric building. That's even after the upgrades!
Yet the NEC calc's call for at least a 1000A service. Seems kinda crazy when you have a transformer good for only 420A that very adequately handles the load!
The 2005 handbook says that the "new" calcs were based on a study of actual restaurants.
The NEC's demand numbers are WAY off!
What am I missing here?!
RC