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(B) Outdoor Installations

National Electrical Code 2020 of Minnesota > 4 Equipment for General Use > 450 Transformers and Transformer Vaults (Including Secondary Ties) > 450.23 Less-Flammable Liquid-Insulated Transformers > (B) Outdoor Installations

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Less-flammable liquid-filled transformers shall be permitted to be installed outdoors, attached to, adjacent to, or on the roof of buildings, if installed in accordance with (1) or (2).

For Type I and Type II buildings, the installation shall comply with all the restrictions provided for in the listing of the liquid.
Informational Note No. 1: Installations adjacent to combustible material, fire escapes, or door and window openings can require additional safeguards such as those listed in 450.27.

Informational Note No. 2: Such restrictions can include, but are not limited to: maximum pressure of the tank, use of a pressure relief valve, appropriate fuse types, and proper sizing of overcurrent protection.
In accordance with 450.27.

Informational Note No. 1: As used in this section, Type I and Type II buildings refers to Type I and Type II building construction as defined in NFPA 220—2018, Standard on Types of Building Construction. Combustible materials refers to those materials not classified as noncombustible or limited-combustible as defined in NFPA 220—2018, Standard on Types of Building Construction.

Informational Note No. 2: See definition of Listed in Article 100.

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(B) Equipment for General Use, Outdoor Installations

Less-flammable liquid-filled transformers shall be permitted to be installed outdoors, attached to, adjacent to, or on the roof of buildings ...