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mike_kaiser_gw

TR GFCIs

11 years ago

Isn't tamper resistance in a GFCI receptacle just redundant? If I stick a fork into the "hot" side of a GFCI while my body is a good path to ground, won't the device trip? A bit of "belt and suspenders" or just another way to get a few more pennies out of consumers?

Comments (11)

  • 11 years ago

    Nope. Take two pointy metal things and hold one in each hand and jam them into the two blade slots. If you are sufficiently isolated from ground, you'll take a lot of current without tripping the GFCI. It's all about a differential between the gazinter vs. the gozouter. In this case everything is nicely balanced (just as if you were a lamp or any other normal load).

  • 11 years ago

    Ron,

    Thanks for the explanation. Next time I feel the need to stick two pointy, metallic things into a non-TR GFCI, I'll make sure I'm well grounded!

    I'm wondering how many kids are injured or killed each year from electrical shocks involving sticking forks into receptacles.

  • 11 years ago
    last modified: 11 years ago

    I think there are easier metal objects to insert into a receptacle slot and make contact than a fork....

  • 11 years ago

    Do it once and you learn quick!

  • 11 years ago

    Car keys are the usual small child item I believe.

  • 11 years ago

    I don't know anyone whose child has stuck anything in a receptacle.

  • 11 years ago

    According to one report from the NFPA, 6 to 12 children are killed each year and over 2,000 injured by sticking things into receptacles. I've never heard of any case in particular.

    Why TRs?

  • 11 years ago

    NFPA says the average new home has 75 receptacles and the use of TR receptacles adds about $40 to the price of a new home. 883,800 private new home completions in 2014 makes the total cost for TR receptacles a bit over $35 million. Assuming (and it's an assumption) that the '08 code was universally adopted by 2010, the added cost in private new home construction thus far has been $141 million.

    The critical piece is what has happened to the rate of injuries and death since implementation of the new code? I might guess it's dropped to nearly zero in new homes and dropped somewhat in older homes as receptacles have been replaced.


  • 11 years ago

    It's hard to judge just whether TR is making much of an impact. The rate had been declining since before TR was introduced. Mostly parents of 1-4 year olds (the sweet age for doing this) have been better educated on baby-safeing the house with either tamper-resistant receptacle covers or the little plug in dohickeys (though CPSC shows that many 2-4 years olds can get these extracted in short order). Of course, not leaving your toddler some place unsupervised where he can mess with receptacles is also an effective means.

    I moved into a house with TR receptacles everywhere and it's largely a PITA though not nearly as bad as some of the goofy things the builder did with the GFCI's in the house.

  • 11 years ago

    I have one surge protector with TR outlets, I agree its mostly a PITA when trying to plug something in.

  • 11 years ago

    Well Mr. Kaiser I should introduce you to my youngest son. He stuck tweezers into one of our outlets. Didn't hurt him much other than the flash/snap when the tips burned. Later in life he took the electrician apprentice classes and is now a signalman with the UP.

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