Tamper resistant options for 2 wire supply to receptacles?

Discussion in 'Electrical Forum discussion & Blog' started by weaver, Feb 16, 2011.

  1. weaver

    weaver New Member

    Messages:
    17
    Location:
    NE Ohio
    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
  2. jwelectric

    jwelectric Electrical Contractor/Instructor

    Messages:
    2,529
    Location:
    North Carolina
    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.
  3. weaver

    weaver New Member

    Messages:
    17
    Location:
    NE Ohio
    Thanks jwelectric. Very helpful. Makes sense. Can I assume that 2011 code doesn't change this? Thanks again. Bob
  4. jwelectric

    jwelectric Electrical Contractor/Instructor

    Messages:
    2,529
    Location:
    North Carolina
    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
  5. weaver

    weaver New Member

    Messages:
    17
    Location:
    NE Ohio
    jwelectric: Another layer of thanks. Bob
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