What year was redundant ground required in hospitals?

[MinnDakEng]

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

 

[DRWeig]

Hiya MinnDakEng,

Please clarify -- the word "redundant" does not appear in the current edition of the NEC at all. Give us a section and verse, or a good physical description of what you're interested in...

Good on ya,

Goober Dave

 

[EEJaime]

MinnDakEng,
I don't know when it started, I can only tell you that it was at least before the mid 1970's as that is when I first got into health care work.

I worked on a local facility where our company had done a remodel project in the late sixties, and found areas with out it, but is was not clear if that was an existing condition when the work was done. The hospital had been built post world war two, so it wasn't required apparently before 1950-ish.

Hope that helps.
EEJaime

 

[PHovnanian]

Patient Equipment Grounding Point. A jack or terminal that serves as the collection point for redundant grounding of electrical appliances serving a patient care vicinity or for grounding other items in order to eliminate electromagnetic interference problems.

Is this the 'redundant ground' you refer to?

 

[DRWeig]

PHovnanian,

Thanks for finding that! I searched the pdf earlier and it didn't come up for some reason...

I can attest, like EEJaime, that it was before the 1970s. Can't say when though.

Good on y'all,

Goober Dave

 

[MinnDakEng]

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 guys!