Go back and look at post 16 the second picture on the left from the top and see where the blade detention slot will fail from an overload. Be sure to examine just how the blade of the end cap inserts into the receptacle and tell me what the difference is between the blade detention and the wire detention parts of the receptacle.
Last edited by Hammerlane; 09-19-2013 at 10:54 AM.
You make three post titled not good, better, best along with your comments of how you are able to retire on what you have earned replacing back stabbed receptacles and would never allowed it to be done by your company so what is one to think?
If you don’t like one installation as compared to another I don’t have a problem but when someone starts trashing one method over the other and both are approved methods then they had better be ready to back their statements because I am coming. I will be holding in my arsinel the reports from the third party testing lab which will trump any and all war stories of how many anyone has ever replaced without finding out why it failed. Just saying that it failed is nothing more than saying I just don’t what caused the failure but it failed.
(Him) Poor ole camel was standing there just fine when someone laid a straw on his back and then he collapsed.
(Her) Pray tell us all, just what else was on that camel’s back.
(Him) Oh I don’t know maybe all the straws he could carry!!!!
(Her) So we are surprised that one more than he was able to carry broke the poor ole animal down?
The stab-loc method is just as good, just as safe, and just as reliable as any other method when done properly. Neither method is good, safe, or reliable when the device is used outside its limits.
It’s all just a personal preference.
Are "spec grade" devices still produced? Don't they lack the back-wiring option?
The commercial rated ones I've used recently did not have a stab-loc capability...they did have holes in the back but they were then clamped in place by the screw tension.
Important note - I'm not a pro
Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014
With all due respect, I will take field experience over an arsenal of reports written by a desk-jockey at 3rd party testing lab.
I will provide the comparison one more time.
***IT'S HARD TO SOAR LIKE AN EAGLE WHEN YOU'RE FLYING WITH TURKEYS***
I'm not much of an electrician, but as an "engineer" I would like to point out that anyone who looks at results from only "field experience" or "lab tests" in isolation is missing out. You need to look at both and then figure out all the discrepancies.
That said, I always assumed that the few stabbed failures I've seen (vs no screwed failures) are due to the "stabbers" using $.50 junk and the "screwers" using $2.00 quality parts. The key word here being "assume"!
Use the strip gauge.
If you are not sure if you are doing it right, then you should not be doing it.
Do what You know how, or get someone to show you.
Having been in this trade for many years I have found that poor workmanship is the cause of many failures. I have seen the top end devices that had failures due to someone not tightening the screw down tight enough to hold the conductor in place. I have seen the conductor stripped out to much and the equipment grounding conductor fault out the device. I have seen the insulation not stripped out enough and have arcing between the conductor and the device to the point of failure.
What I have never seen in almost 50 years of experience is a stab-loc failure when installed per the instructions that come with the device and the device not overloaded.
My point being is that any installation that is not done in a good workmanship manner will fail no matter how much is spent on the device or what method is being used to terminate the conductor. If done properly the stab-loc is just as good as any other method. The wrapping of the screw is bad if not done properly.
A #14 conductor has a area of .0097 square inches. Wrapping the conductor around the screw does not give more area for the conductor to contact the dev ice as the maximum current carrying area is limited to the area of the conductor.
In other words as long as .0097 square inches of conductor is in contact with the device the maximum amount of current that the conductor can carry is flowing to that device and wrapping the conductor around the screw in no way allows more current to flow through the conductor