Design Guidelines for Dry-Type Transformers

Indoor transformers of greater than _____ rating shall be installed in a transformer room of fire-resistant construction.

a) 75kVA
b) 87.5kVA
c) 112.5kVA
d) 250kVA

See answer and applicable Code reference

The correct answer is: c) 112.5kVA

Article 450 covers the installation of all types of transformers. Section 450.21 notes the specific provisions applicable to dry-type transformers installed indoors. As per 450.21(B), "Individual dr

Register to view the full article

Register on EC&M and gain access to premium content, including this article and much more.

Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.