Tamper resistant options for 2 wire supply to receptacles?

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weaver

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Would like to convert to tamper resistant receptacles to protect kids in house. Existing supply is 2 wire. Have been able to find only receptacles with ground. Can’t afford to rewire existing 2 wire knob & tube with 3 wire now. Would prefer not to tear up brick & plaster lath & floors to supply ground to each location (4 levels, 1920’s house).

Can I use the 3 hole TR receptacles? Would labeling them “No Ground†and / or blocking the ground connection to prohibit the use of a three prong plug be acceptable or advisable?

Thanks. Bob
 

JWelectric

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250.130 (C) Nongrounding Receptacle Replacement or Branch
Circuit Extensions. The equipment grounding conductor
of a grounding-type receptacle or a branch-circuit extension
shall be permitted to be connected to any of the following:
(1) Any accessible point on the grounding electrode system
as described in 250.50
(2) Any accessible point on the grounding electrode conductor
(3) The equipment grounding terminal bar within the enclosure
where the branch circuit for the receptacle or
branch circuit originates
(4) For grounded systems, the grounded service conductor
within the service equipment enclosure
(5) For ungrounded systems, the grounding terminal bar
within the service equipment enclosure


406.3 (D) Replacements. Replacement of receptacles shall comply
with 406.3(D)(1), (D)(2), and (D)(3) as applicable.
(1) Grounding-Type Receptacles. Where a grounding
means exists in the receptacle enclosure or an equipment
grounding conductor is installed in accordance with
250.130(C), grounding-type receptacles shall be used and
shall be connected to the equipment grounding conductor in
accordance with 406.3(C) or 250.130(C).
(2) Ground-Fault Circuit Interrupters. Ground-fault
circuit-interrupter protected receptacles shall be provided
where replacements are made at receptacle outlets that are
required to be so protected elsewhere in this Code.
(3) Non–Grounding-Type Receptacles. Where attachment
to an equipment grounding conductor does not exist
in the receptacle enclosure, the installation shall comply
with (D)(3)(a), (D)(3)(b), or (D)(3)(c).
(a) A non–grounding-type receptacle(s) shall be permitted
to be replaced with another non–grounding-type receptacle(
s).
(b) A non–grounding-type receptacle(s) shall be permitted
to be replaced with a ground-fault circuit interruptertype
of receptacle(s). These receptacles shall be marked
“No Equipment Ground.†An equipment grounding conductor
shall not be connected from the ground-fault circuitinterrupter-
type receptacle to any outlet supplied from the
ground-fault circuit-interrupter receptacle.
(c) A non–grounding-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 groundfault
circuit interrupter shall be marked “GFCI Protectedâ€
and “No Equipment Ground.†An equipment grounding
conductor shall not be connected between the groundingtype
receptacles.
 

weaver

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Thanks jwelectric. Very helpful. Makes sense. Can I assume that 2011 code doesn't change this? Thanks again. Bob
 

JWelectric

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If you are under the 2011 then the replacement of a two wire will require that it be both GFCI and Arc Fault protected after 1-1-14
 
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