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Thursday, December 16, 2021
Question:
Hello and thanks for this Code service.
Can a 15 kVA transformer be wall or ground mounted on 2" x 4" boards?
Charlie Tate
A
Answer:
Charlie,
The installation rules for dry type transformers are located in Section 450.21(A) and the related exception which reads as follows: Dry-type transformers installed indoors and rated 112 1∕2 kVA or less shall have a separation of at least 12 in. from combustible material unless separated from the combustible material by a fire-resistant, heat insulated barrier. The exception reads as follows: This rule shall not apply to transformers rated for 1000 volts, nominal, or less that are completely enclosed, except for ventilating openings.