PROVISIONS FOR DIFFERENT TYPES OF TRANSFORMERS


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PROVISIONS FOR DIFFERENT TYPES OF TRANSFORMERS
PROVISIONS FOR DIFFERENT TYPES OF TRANSFORMERS134. Dry-type transformers installed indoors. Transformers rated 112½ kVA or less shall have a separation of at least 300 mm (12 in) from combustible material unless separated therefrom by a fire-resistant heat-insulating barrier or unless of a rating not exceeding 600 V and completely enclosed with or without ventilating openings.Transformers with a rating of more than 112½ kVA shall be installed in a transformer-room of fire-resistant construction unless they are constructed with class 155 or higher insulation systems and are separated from combustible material by not less than 1.83 m (6 ft) horizontally and 3.7 m (12 ft) vertically or are separated therefrom by a fire-resistant he…
Citation
Terrell Croft; Frederic P. Hartwell; Wilford I. Summers: American Electricians' Handbook, Sixteenth Edition. PROVISIONS FOR DIFFERENT TYPES OF TRANSFORMERS, Chapter (McGraw-Hill Professional, 2013), AccessEngineering Export