ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
twh 10
Admin 4
Recent Posts
Correct rotation, wrong sequence
by Potseal. 05/25/17 11:34 PM
Dryer, Range grounding from "Main" panel
by sparkync. 05/25/17 05:49 PM
210.70 / Wall Switch / When adopted?
by gfretwell. 05/24/17 09:18 PM
Any UL 508 experts out there?
by sparkyinak. 05/23/17 11:04 PM
Heat pump conundrum
by sparkyinak. 05/21/17 08:49 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
236,829 Are you busy
171,846 Re: Forum
164,750 Need opinion
Who's Online Now
0 registered members (), 59 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#64204 - 04/02/06 01:31 PM Understanding nameplate information.  
Cinner  Offline
Member
Joined: Dec 2004
Posts: 78
Kelowna, B.C., Canada
Can someone explain a couple of things to me on this nameplate info for a convection oven:

TOTAL KW = 5.5KW

208, 240v 3 Phase Loading - KW per Phase:
L1-L2 = 2.5, L2-L3 = 0 , L1-L3 = 3Kw

Nominal Amps per line wire:
3 Phase 208 Volt
L1 =23, L2= 10, L3=12

Why is there unbalanced loads per phase and how would you choose a cable wire size with all the different amperages? Would you base cable wire size on the largest - 23 amps? Would you use a 3 pole 30 amp breaker?


Work Gear for Electricians and the Trades

#64205 - 04/02/06 01:39 PM Re: Understanding nameplate information.  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
The unbalanced current is the result of single phase fan motors and controls.

Yes you must select a cord and branch circuit with at least a 23 amp capacity.

[This message has been edited by iwire (edited 04-02-2006).]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#64206 - 04/02/06 01:43 PM Re: Understanding nameplate information.  
Cinner  Offline
Member
Joined: Dec 2004
Posts: 78
Kelowna, B.C., Canada
L2-L3 = 0 kw...why no load b/w 2 and 3?

[This message has been edited by Cinner (edited 04-02-2006).]


#64207 - 04/02/06 03:35 PM Re: Understanding nameplate information.  
JBD  Offline
Member
Joined: Jul 2001
Posts: 599
WI, USA
With no load between L2-L3 it would be very easy to convert the oven to work on a 2 wire single phase supply.


#64208 - 04/03/06 01:26 AM Re: Understanding nameplate information.  
Cinner  Offline
Member
Joined: Dec 2004
Posts: 78
Kelowna, B.C., Canada
would a 3 pole 30 amp breaker be sufficient?



Member Spotlight
Vlado
Vlado
Croatia
Posts: 28
Joined: February 2011
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.013s Queries: 14 (0.003s) Memory: 0.7668 MB (Peak: 0.9047 MB) Zlib enabled. Server Time: 2017-05-26 20:48:34 UTC