NM CID EL-1 Practice Questions - New Mexico CID EL-1 Electrical Distribution Systems, Including Transmission Lines Examination Exam

Access More Questions

NEC 2020 450.43 requires a transformer vault doorway to have a fire-rated door that is lockable and, where required by the vault construction, a fire rating of:

20 minutes with no sill 1 hour, swinging into the vault only 3 hours (or as required to match the vault), lockable, and arranged so it is kept closed no rating if the transformer is oil-filled

Correct Answer:

3 hours (or as required to match the vault), lockable, and arranged so it is kept closed

Access more questions from this quiz

Continue to NM CID EL-1 Practice Questions - New Mexico CID EL-1 Electrical Distribution Systems, Including Transmission Lines Examination Exam for more practice questions and the full quiz experience.

Access More Questions