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Hello, I am trying to interpret data on a transformer nameplate and I am a little confused by it. How exactly are the two ratings for class related to the two rating for both KVA and C Rise? If the transformer doesn't currently have fans on it how would this change (Would it be correct to assume the data would then be Class:OA, KVA:1000, C Rise: 55)?

Here is some transformer data:
Mfg: Square D Company
Liquid filled
Class: OA/FA
Hv: 11500 Delta
Lv: 480Y/277
KVA: 1000/1120
C rise: 55/65
5.1% Imp at 1000 KVA
No resistance on ground
 

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Hello, I am trying to interpret data on a transformer nameplate and I am a little confused by it. How exactly are the two ratings for class related to the two rating for both KVA and C Rise? If the transformer doesn't currently have fans on it how would this change (Would it be correct to assume the data would then be Class:OA, KVA:1000, C Rise: 55)?

Here is some transformer data:
Mfg: Square D Company
Liquid filled
Class: OA/FA
Hv: 11500 Delta
Lv: 480Y/277
KVA: 1000/1120
C rise: 55/65
5.1% Imp at 1000 KVA
No resistance on ground

OA is liquid immersed air cooled.
FA is liquid immersed fan cooled.

The first rating 1000 KVA and C rise is for a OA transformer
The second rating 1120 and C rise is for a FA transformer
 
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