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  1. MinnDakEng

    What year was redundant ground required in hospitals?

    I am referring to 517.13 (A) and (B) which states "...The equipment groundng conductor shall be sized...and installed in metal raceways or as a part of listed cables... Redundant may be the wrong wording but it would be additional to the to the metal raceway system being a ground path. Thanks...
  2. MinnDakEng

    What year was redundant ground required in hospitals?

    I am working in an old hospital facility and was wondering what year was the redundant ground required by the NEC?
  3. MinnDakEng

    Increased Arc Flash rating on transformer secondary

    Can anyone explain the reasoning the Arc Flash rating is higher on the secondary side of a transformer than the primary side?

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