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
Safety at heights?
by HotLine1
01/21/17 08:51 PM
International Wire Colour Codes
by Texas_Ranger
01/21/17 03:29 PM
Looking for older post
by Texas_Ranger
01/21/17 03:22 PM
Last time to chat here
by Trumpy
01/20/17 11:41 PM
Unsafe Situations
by Trumpy
01/20/17 09:46 PM
New in the Gallery:
Desk-mounted "power-board"
Shout Box

Top Posters (30 Days)
Admin 35
HotLine1 21
Trumpy 19
Ruben Rocha 17
gfretwell 16
Who's Online
2 registered (Admin, dougwells), 76 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#100991 - 01/25/07 04:15 PM Ranges
dilydalyer Offline
Member

Registered: 01/08/07
Posts: 59
Loc: tennessee
In the 2002 code,is T220.19 for load calculations....I have a gut telling me you can set your overcurrent prot. and wire size by this table......

Top
2017 / 2014 NEC & Related Books and Study Guides
#100992 - 01/28/07 03:26 AM Re: Ranges
jdo1942 Offline
Junior Member

Registered: 11/13/05
Posts: 32
Loc: st. louis, mo. usa
This section of the code is for multiple groups of ranges. It is the most confusing part of the code in My opinion. You must use all three columns. It is not like dryers that run a percentage on the total number. To use this table it takes a bit figuring out

Top
#100993 - 01/28/07 07:09 AM Re: Ranges
dilydalyer Offline
Member

Registered: 01/08/07
Posts: 59
Loc: tennessee
When I posted this message I meant to say GUY instead GUT....sorry.I would appreciate input on this...thanks jdo.

Top
#100994 - 01/28/07 07:34 AM Re: Ranges
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
This was posted previously last week and I responded but I'm not sure what I said was very definitive. I have since asked around and looked at the code again and here's what I belive the code says:
220.19 (2002) and 220.55 (2005) and their associated tables are for calculating the load(s) for branch circuits, feeders or services.

The other code reference 210.21(B)(4) tells us that we can size the receptacle based on 220.19 ('02) or 220.55 ('05) so if we size the receptacle using this approach we more than likely would size the rest of the circuit this way.

Also look at Note 4 for Table 220.19 ('02) or 220.55 ('05) and you get a sense of how a branch circuit for a single range is sized.

The code also says that for a 12KW range the receptacle can not be less than 40a.

8000/240=33.3 but we must use a 40a. wire and overcurrent and I think a 50a. receptacle. I don't believe they make a 40a. receptacle

I would like to hear from others as to my error or lack thereof.

[This message has been edited by George Little (edited 01-28-2007).]
_________________________
George Little

Top
#100995 - 01/28/07 08:35 AM Re: Ranges
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
Interesting:
12000 KW range would be calculated as following for load.

Start with 8000 and add 1600 (based on Note 1)=9600.

9600/240 = 40a.
_________________________
George Little

Top
#100996 - 01/28/07 09:12 AM Re: Ranges
dilydalyer Offline
Member

Registered: 01/08/07
Posts: 59
Loc: tennessee
tks...give me some more studying

Top
#100997 - 01/28/07 03:20 PM Re: Ranges
dilydalyer Offline
Member

Registered: 01/08/07
Posts: 59
Loc: tennessee
But don't u think I could not treat the only range in the house,let's say a 12kw,as an 8kw as far as wire and breaker size?

Top
#100998 - 01/28/07 04:23 PM Re: Ranges
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
Yes
_________________________
George Little

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