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#15402 - 10/17/02 03:03 PM Ground screw not tight  
lbartel  Offline
Member
Joined: Jul 2002
Posts: 13
I had a bathroom light that would sometimes flicker a bit when turned on. Darned back-stab connections. Anyway, ALL of the switch and outlets I examined on that circuit had the ground wire wrapped around the ground screw but the screw was not tightened. The house is around 13 or 14 years old. I bought it 1.5 years ago. Looks like I'll have to methodically go through the house checking, uh, no, tightening the ground screws. Also the outlets were daisy chained via the back-stab connector. Has that ever been allowed?


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#15403 - 10/17/02 08:01 PM Re: Ground screw not tight  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,803
Brick, NJ USA
lbartel:
The "back stab" install was a prevelant method used in our area of NJ. Matter of fact, I even came across a few that had stranded wire shoved in. To the best of my knowledge, it aws OK to Code. NEC states "multi-wire" branch circuits, neutrals must be "made-up"; not the exact word-for-word, but the meat.

My crews are in the habit of "making-up" ALL splices with 'tails for the devices. (Grd, Hot & neut) We do this prior to "rough" inspection. Takes a few "extra" minutes; but we don't get any call backs. BTW, we don't "back stab". Under the screws, twist it right, & make it tight. The only "back entry" we allow is the spec grade devices; yes they cost more, but they are good & quick.

We do primarily comm, with very little resi.

John


John

#15404 - 10/17/02 08:57 PM Re: Ground screw not tight  
electric-ed  Offline
Member
Joined: Jul 2002
Posts: 175
Canada
I don't believe the loose equipment grounding conductor (EGC) was making your light flicker. A properly wired lighting or receptacle supplied load device will operate fine without any EGC.

I would check those back-wired devices further for the cause of the flickering light.

Ed


#15405 - 10/18/02 09:18 AM Re: Ground screw not tight  
lbartel  Offline
Member
Joined: Jul 2002
Posts: 13
Sorry electric-ed, I didn't mean to say that the loose ground was the cause of the flicker. I've seen the back-stab connections go bad, causing intermittent failures. I do have a serious problem with the loose ground in that should there be a fault, the ground may or may not protect the user.

Another light in the house started flickering last night. Loose feed wire on the switch. Reworked all the switches and outlets on that circuit. There actually were some ground screws tightened down.

- les


#15406 - 10/18/02 11:06 PM Re: Ground screw not tight  
harold endean  Offline
Member
Joined: Feb 2002
Posts: 2,233
Boonton, NJ
lbartel,

Even though you might not like them, but I think that "back stab" devices have been and are still OK under the NEC as per the manufactures instructions. I have seen where backstabs have lasted 12 years without a problem. The biggest problem I see with them, is that the installer, doesn't check to make sure that the back stab is all the way in. They push it in for just a little bit, and then after awile, they fall apart.


#15407 - 10/19/02 08:50 AM Re: Ground screw not tight  
Gwz  Offline
Member
Joined: Apr 2002
Posts: 197
If everything is properly installed, back stabs should be OK.

One of the biggest problems, I see, is that in time, or even on new installs, the receptacle is not rigidly secured to the surface (wall). Every time a plug is plugged into ( and removed from ) the receptacle, there is a slight movement of the receptacle in the same axis as the stab-in conductor. After many uses of Plugging-in and pulling-out of the male plug, the receptacle back-stab contacts start to have a sliding action with the stab-in conductor, THEN a loose contact is in the making.

Just don't use the stab-in's for a long trouble free installation. ( opinion only ).


#15408 - 10/19/02 09:07 AM Re: Ground screw not tight  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
The back stab devices are available only for 14 AWG at 15 amps, and use of those types of devices for 12 awg violates 110.3(B).

"Screwless terminal connectors of the conductor push-in type (also known as "push-in-terminals") are restricted to 15 A branch circuits and are for connection with 14 AWG solid copper wire only. They are not intended for use with aluminum or copper-clad aluminum wire, 14 AWG stranded copper wire, or 12 AWG solid or stranded copper wire."

check at: www.ul.com

RTRT.GuideInfo
Receptacles for Attachment Plugs and Plugs

[This message has been edited by Joe Tedesco (edited 10-19-2002).]


Joe Tedesco, NEC Consultant

#15409 - 10/19/02 07:47 PM Re: Ground screw not tight  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Interesting comments. Used to be that the hands-down-first-to-die was the device serving/behind the kitchen refrigerator-freezer.

Duty seems to have a major influence in the life of poke-wired connections. Unless you "get" to take service calls on residences a year or five after construction, they almost always seem to have a perfect record.




[This message has been edited by Bjarney (edited 10-19-2002).]


#15410 - 10/20/02 11:30 PM Re: Ground screw not tight  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,803
Brick, NJ USA
How about the one at the coffee maker? Easier to get at than the frig. "Duty" has a lot to do with it, glad to see someone brought that up. Used to be that the "stabs" where good for #12 (legal) 'till the NEC figured 15 amps is max. Like I said above, make up the splices, put in the 'tails, under the screws, twist it right, & make it tight!
John


John

#15411 - 10/20/02 11:50 PM Re: Ground screw not tight  
electricwonder  Offline
Member
Joined: Apr 2002
Posts: 22
New Martinsville, WV, USA
I've done a few years service work, doin' house calls... I don't know how meny times so meny problems have led back thoes dang push-in type switches and recpt. The guy I used to work for has threatend to fire his guys if they every use 'em on his jobs. The bottom line is contact area. There is meny times more contact area between the screw head and the wire than there is between that tiny little tab that pinches the wire on push-in connectors. Someone else said this, and I also do it, strip the wires, include a pig-tail, twist them together, use a good wire nut, put on nice and tight. Use the screw connections on the device, connecting the pig-tailed wires... should last a long time if done properly. Like I said... think "contact area". The more, the better. It's just like oversizing wire, more is less. More area, less heat. Less heat, less fire. Or, maybe a little less flickering!


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