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What is the gauge on steel used for the cover, front and side panels, and base of ventilated dry transformer 600V and below, 15KVA through 500KVA?

Because different types of transformers of similar kVA ratings may be in different enclosures, this question is answered in terms of enclosure number, rather than kVA.  The information below also pertains to non-ventilated transformers by enclosure number.  The D or E suffix on the enclosure number simply denotes ventilated (D) or non-ventilated (E).

Enclosures #s 17, 18, 19, and 20 use:
Sides and Top:  14 guage
Front and Rear:  16 guage
Base:  12 guage

Enclosures #s 21, 22, 23, 24, 25, 26, 28, 29, and 30 use:
Sides and Top:  14 guage
Front and Rear:  16 guage
Base:  3 piece base with (2) 7 guage channels and a 14 guage pan


CTA-ID : 15622
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