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#64204 - 04/02/06 10:31 AM Understanding nameplate information.
Cinner Offline
Member
Registered: 12/01/04
Posts: 77
Loc: 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 10:39 AM Re: Understanding nameplate information.
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4343
Loc: 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
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#64206 - 04/02/06 10:43 AM Re: Understanding nameplate information.
Cinner Offline
Member
Registered: 12/01/04
Posts: 77
Loc: 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).]
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#64207 - 04/02/06 12:35 PM Re: Understanding nameplate information.
JBD Offline
Member
Registered: 07/12/01
Posts: 599
Loc: 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.
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#64208 - 04/02/06 10:26 PM Re: Understanding nameplate information.
Cinner Offline
Member
Registered: 12/01/04
Posts: 77
Loc: Kelowna, B.C., Canada
would a 3 pole 30 amp breaker be sufficient?
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