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#114785 06/26/03 09:50 PM
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[Linked Image]

Comments?

- ThinkGood

#114786 06/26/03 10:58 PM
Joined: Apr 2002
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Think Good:
Another good reason not to "back stab" receptacles.
Looking close...is that a little bit of green corrosion on the black conductor??

Looks like THW insulation, metal box, so a guess it's BX. Self-grounding receptacle (look at the top yoke), appears to be "newer" as it's probably been replaced.
Thinking further, the wire may have been bad, or starting when the device was replaced. Finally, the circuit may be over-fused, and/or having a "heavy" load on for extended time. (Electric heater, cooking appliances, etc)

Lastly, also could be excessive "heat" from the male attachment plug.
John


John
#114787 06/26/03 11:55 PM
Joined: Jun 2003
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I know that UL and ANSI and others work on putting the standards (minimums) together, but the guys in the field run into this all the time. I think it is time for this standard to be revisited and revised (upwards).

Pierre


Pierre Belarge
#114788 06/27/03 03:41 AM
Joined: Aug 2002
Posts: 1,081
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Hi, John.
Long time...etc.

I can tell you do this for a living!

This is from a neighbor's kitchen that was recently redone.

The photo didn't show the green very well, but the hot did have green on it.

The conductors were from BX. It's too late to find the conductors to check, but the insulation was thicker than what is found in Romex (Is that THHN?). There was no grounding conductor in the cable. Does that confirm THW?

P. S. If this was not in an area being renovated, assuming the overload protection was the correct rating and the device was replaced with a GFCI (as this was in a kitchen), would the BX be considered safe to use? (Does that browned area cause the whole run to be questionable?)

P. P. S. How reliable is a ground on a "self-grounding" device? The box was somewhat corroded.

Pierre:
Do you mean the 75ºC rating?

[This message has been edited by ThinkGood (edited 06-27-2003).]

#114789 06/27/03 07:00 AM
Joined: Jun 2003
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Hello Thinkgood

I meant the 'backstabbing', what UL and manufacturers call 'pushin'. I get calls all the time relating to this. It is funny how all say they would never do this, who is doing it then?
BTW - I live by the Tappen Zee Bridge, is that pretty close to you?

Pierre


Pierre Belarge
#114790 06/28/03 03:27 AM
Joined: Jul 2002
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ThinkGood,
Mama's got something good cookin' there, mate!. [Linked Image]
It's sure been hot in there.

#114791 06/28/03 06:34 AM
Joined: Dec 2000
Posts: 4,294
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Got to love those backstabbers.
The insulation in the cable is most likely type TW (60°C). Type THW has a much thicker insulation, and was generally used in conduit, rather than cable.
Would the green patina be from the conductor getting wet??...S

#114792 06/28/03 07:14 AM
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Steve,
What is back-stabbing, in relation to this posting?

#114793 06/28/03 09:41 PM
Joined: Mar 2001
Posts: 333
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Trumpy, "back stabbing" is when the wire is inserted into a hole in the back of the device. The electrical continuity between the conductor and the device is derived by a springy(?) clip that pushes against the wire. The connection is no where close to being as good, as the wire being under a screw. The initial result of course is heat build-up.


Steve
#114794 06/28/03 10:07 PM
Joined: Oct 2000
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Trumpy,

I think it's a similar connection to what the Wago connectors use if you are familiar with those.

Bill


Bill
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