SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/hamg-g0b12

What is the purpose of a power supply interlock?

It removes dangerous voltages if the cabinet is opened.

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  1. To stop changes that would void the warranty
  2. To ensure dangerous voltages are removed if the cabinet opens ✔
  3. To shut down the unit if it becomes too hot

Why: An interlock is a safety switch. It ensures dangerous voltages are removed if the cabinet is opened, so no one reaches live high-voltage parts.

Huh, didn't know that: Lightning arrestors should be located where the feed lines enter the building.

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References

Answer: To ensure dangerous voltages are removed if the cabinet opens. An interlock is a safety switch. It ensures dangerous voltages are removed if the cabinet is opened, so no one reaches live high-voltage parts.

  1. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf
    What is the purpose of a power supply interlock?
    Checked 2026-10-11.
  2. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf
    C. To ensure that dangerous voltages are removed if the cabinet is opened
    Checked 2026-10-11.
  3. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf
    Where should lightning arrestors be located? A. Where the feed lines enter the building
    Checked 2026-10-11.

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