Greetings all it seems to have become a common and good practice to deal with non-grounding 2 prong receptacles and ungrounded lighting by adding GFCI protection.
I am making a list of things that require an equipment ground that are not covered under the big three exceptions for existing ungrounded systems: 406.4(D)(2), 404.9.(B) and 410.44 .
In a old house if a snap switch is replaced with a modern dimmer or an occupancy sensor an equipment grounding conductor needs to be brought to the switch box as the exceptions from 404.9.(B), Exception No. 1 only covers snap switches, and the UL product standards for occupancy sensors/dimmers might rely on a EGC being present.
Also it seems any of the appliances / equipment listed in 250.114 (3) such as "Refrigerators, freezers, and air conditioners, Clothes-washing, clothes-drying, dish-washing machines"
preempt 406.4(D)(2) and require a real EGC.
It is common to see ceiling fans and bathroom fans added onto/ relocated on non-grounding circuits and since these are appliances I see no exceptions from grounding for them.
The last one is article 424, Fixed electric space heating, still popular in this part of the country. I see no exception at all from 250.110 for them, so perhaps even a replacement, and defiantly a relocation would trigger grounding of those appliances.
Thanks in advance for any feedback.
EDIT on further thought I imagine ceiling paddle fans above 8 ft would generally be exempt per 250.110(1)
I am making a list of things that require an equipment ground that are not covered under the big three exceptions for existing ungrounded systems: 406.4(D)(2), 404.9.(B) and 410.44 .
In a old house if a snap switch is replaced with a modern dimmer or an occupancy sensor an equipment grounding conductor needs to be brought to the switch box as the exceptions from 404.9.(B), Exception No. 1 only covers snap switches, and the UL product standards for occupancy sensors/dimmers might rely on a EGC being present.
Also it seems any of the appliances / equipment listed in 250.114 (3) such as "Refrigerators, freezers, and air conditioners, Clothes-washing, clothes-drying, dish-washing machines"
preempt 406.4(D)(2) and require a real EGC.
It is common to see ceiling fans and bathroom fans added onto/ relocated on non-grounding circuits and since these are appliances I see no exceptions from grounding for them.
The last one is article 424, Fixed electric space heating, still popular in this part of the country. I see no exception at all from 250.110 for them, so perhaps even a replacement, and defiantly a relocation would trigger grounding of those appliances.
Thanks in advance for any feedback.
EDIT on further thought I imagine ceiling paddle fans above 8 ft would generally be exempt per 250.110(1)
Last edited: