The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Industrail Control Panel bonding per 409.108
by sparkyinak
Yesterday at 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 10
sparkyinak 9
Texas_Ranger 8
Potseal 6
Who's Online
0 registered (), 186 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#82456 - 11/14/02 04:16 PM New Electrical Loads
marineEE Offline
Junior Member

Registered: 11/14/02
Posts: 3
Loc: Bremerton, WA
I recently gutted an industrial kitchen, replacing several elect appliances with gas, and replacing some 208V appliances with larger 480V appliances. Using article 220-35 to verify the existing service was adequate, I calculated 150kVA (208V) removed from the kitchen and 130kVA (480) installed, for a net reduction in load. According to our local inspector, however, I cannot take credit for any load removed. I must use the maximum demand (last 12 months) times 125% and add the 150kVA of new load! This makes no sense to me!!! My calculations would indicate that I have doubled the kitchen load, when in fact, it has been reduced. Is this tha actual intent of the NEC?!!!

Top
2014 / 2011 NEC & Related Books and Study Guides
#82457 - 11/14/02 04:54 PM Re: New Electrical Loads
nesparky Offline
Member

Registered: 06/21/01
Posts: 650
Loc: omaha,ne
I would submit the plans with a new calculated load for the new remodeled load of the entire building/service. You will have to clearly note the old circuitry and conduits were removed so that the no longer apply.
_________________________
ed

Top
#82458 - 11/15/02 08:44 AM Re: New Electrical Loads
marineEE Offline
Junior Member

Registered: 11/14/02
Posts: 3
Loc: Bremerton, WA
We considered this, but that means we can't use the 12-month usage as a baseline, and it also means updating panel schedules on about 30 panels for a 20 year old building. That seems like the inspector is simply forcing us to spend a lot of time for a requirement that is NOT the intent of the NEC, nor has any technical requirement.

Top
#82459 - 11/16/02 11:34 PM Re: New Electrical Loads
Jacuzzi Guy Electric Offline
Member

Registered: 10/25/02
Posts: 33
Loc: Dearborn Heights Michigan Unit...
It's simple:

Your calculated load is 150 kVa. Table 220.11 "all others" 100% demand factor. Do the math, if you have a 480 service, then you must only use 80% of your panel's capacity. So then:

150,000 x 1.25 = 187,500 VA

187,500 VA/480V= 390.625A

Your next available main SVC. is a 400 Amp.

Please let me know if this is any help.

[This message has been edited by Jacuzzi Guy Electric (edited 11-17-2002).]

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals