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#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?


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#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?



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