scope:

This Standard, except as noted in Glause 1.2, applies to all liquid-filled transformers, auto-transformers, booster transformers, load-tap-changing transformers, grounding transformers, phase-shifting transformers, seriesvoltage regulators, and shunt reactors.

Note: The term "transformer(s)" in this Standard refers to the overall unit and not just to the electrical components implied by the definition.

This Standard does not apply to the following:

(a) Distribution transformers (GSA Standard G2, Single-Phase and ThreePhase Distribution Transformers, Types ONAN and LNAN);

(b) Instrument transformers (GSA Standard G13, InstFument Transformers);

(c) Rural transformers (GSA Standard G138, Single-Phase Pivot-Type Transformers Type ONAN for Rural Applications);

(d) Dry-type transformers (GSA Standard G9, Dry-Type Transformers);

(e) Pad-mounted transformers (GSA G227 Series of Standards);

(f) Submersible transformers (GSA G301 Series of Standards);

(g) Subway transformers (GSA Standard G199, Subway Transformers Including Network Type);

(h) Rectifier transformers, welding transformers, furnace transformers, 'starting transformers, testing transformers, or current-limiting reactors.

Note: In the above list the pertinent CSA Standard number has been noted where such exists. Where no CSA Standard exists, this Standard may be used insofar as it applies.

intended Use:

All liquid-filled power transformers and reactors shall be suitable for outdoor service unless specified for indoor service.