mshields
Senior Member
- Location
- Boston, MA
Do I need 2 levels of ground fault for a building covered under 517.40 (nursing home and long term care) or is that just for hospitals.
2 levels of ground fault for a Nursing home/Medical Office Building
- Thread starter mshields
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fmtjfw
Senior Member
- Location
- Fairmont, WV, USA
Do you mean redundant grounding?
Do you mean 6mA and 100mA?
Do you mean 6mA and isolated systems?
More details needed
Do you mean 6mA and 100mA?
Do you mean 6mA and isolated systems?
More details needed
jimdavis
Senior Member
- Location
- salt lake city, UT USA
The OP is referring to the requirements of 517.7(B). Unless the facility has critical care facilities or life support equipment it would not be needed.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Also, FWIW, I read 517.17(B) [2011] as describing an additional requirement when GF protection is provided at a high feeder level, but not mandating the presence of higher level protection in the first place. The two sections that do that, 215.15 and 230.95, apply only when the circuit at the upstream point is between 150 and 600V to ground and more than 1000A.
A circuit with greater than 150V to ground is not as likely to be found in a patient area. Although I guess that if a higher voltage circuit at the service or feeder level supplies a lower voltage circuit via a transformer downstream, those two sections might apply. Not that a GF on the secondary of a transformer would have any way of tripping a GF device on the primary side.
This one may require some more exploring.
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