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bcolbert

04:13PM | 10/09/02
Member Since: 10/08/02
2 lifetime posts
Bvelectrical
Can you GFCI protect outlets in a non-grounded two wire sheathed electrical cable wiring system?

If so, please explain.

Joe Tedesco

05:10PM | 10/09/02
Member Since: 07/27/02
140 lifetime posts
"(3) Nongrounding-Type Receptacles. Where grounding means does not exist in the receptacle enclosure, the installation shall comply with (a), (b), or (c).

(a) A nongrounding-type receptacle(s) shall be permitted to be replaced with another nongrounding-type receptacle(s).

(b) A nongrounding-type receptacle(s) shall be permitted to be replaced with a ground-fault circuit interrupter-type of receptacle(s).

These receptacles shall be marked “No Equipment Ground.”

An equipment grounding conductor shall not be connected from the ground-fault circuit-interrupter-type receptacle to any outlet supplied from the ground-fault circuit-interrupter receptacle.

(c) A nongrounding-type receptacle(s) shall be permitted to be replaced with a grounding-type receptacle(s) where supplied through a ground-fault circuit interrupter.

Grounding-type receptacles supplied through the ground-fault circuit interrupter shall be marked “GFCI Protected” and “No Equipment Ground.”

An equipment grounding conductor shall not be connected between the grounding-type receptacles."

www.nfpa.org

Electrical Inspector

02:07AM | 10/10/02
Member Since: 09/27/02
73 lifetime posts
Joe is right.

a GFI has a donut type sensor, a 'CT' . the hot and nuetral ( black & white) run through the donut.

as long as the current used matches the current returned, the wires 'cancel out', or the donut sees 0 current.

If any current 'leaks' or finds a way to return other than this, the donut 'sees' the imbalance, at which the trip mechanism is activated.

the 'grouinding' , or 'bare' conductor is not part of this mechanism.

hope this helps.

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