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In Reply to: RE: Wiring outlet box posted by jea48 on April 14, 2017 at 18:54:08
If you take note the picture references NEC code. While it does show a metal conduit, in housing it is only required where the cable would otherwise be exposed, I.E. up a wall into the joists (again NEC code and BOCA), therefore no promise that it is grounded. I'm aware the picture does not show the ground wire connected but if the insulating tabs are removed with the ground wire connected to the box or the receptacle (I prefer the receptacle)both are considered grounded.
Perhaps that is why the OP's electrician wasn't concerned about grounding the box.
If you take note the picture references NEC code.
Yes it does, Article 250.146 Connecting Receptacle Grounding Terminal to Box.
And for the pictures shown in your link 250.146(A) Surface Mounted Box.
You are looking at the wrong section of Article 250 though. You need to read 250.148 Continuity and Attachment Of Equipment Grounding Conductors to Boxes.
Yes it does reference the code, but it's wrong. The far right box in the picture is connected with a compression connector, this is not considered an acceptable bond by the NEC, it must be a set screw type connector as shown for the other boxes.
The far right box in the picture is connected with a compression connector, this is not considered an acceptable bond by the NEC, it must be a set screw type connector as shown for the other boxes.
I've been doing this for almost four decades, apparently they've amended the code to allow compression connectors UL listed or approved for the purpose and provide an adequate path for ground. This is rather open ended as it leads to all kinds of problems if not adequately employed. First, there's a maximum length the conduit can be run without a ground installed with variables such as number and size of conductors installed, voltage, amperage, type of conduit etc. If someone is injured or killed and the installation is found inadequately grounded through testing it wouldn't be pretty.
Just as its perfectly fine to use the device (meaning the receptacle) as a means of circuit continuity, IE back stabbing or wrapping the screws, but any electrician worth his salt would tail the wire's first, and not use a compression connector as part of the equipment ground integrity.
Please explain "tail the wires first"....thanks in advance.
Well its much easier with pictures, I actually posted a tutorial on AK about this very subject.
It's not that hard to do, but it adds time, and materials to the job, so many electricians don't do it because it's not required by the NEC, but it should be. It's my opinion arc fault breakers would never have come into existence if electricians had only been required to do this.
I'll try to explain. If you were to remove the receptacle from the box and looked inside you would see at least one black, white, and bare (maybe green) wires.
When there are two or more of each the bare wires are twisted together with one tail going to the outlet's ground screw. Then the blacks and whites are either back stabbed into the holes, or wrapped around the screws on the receptacle. This makes the device an integral part of the circuits integrity. If the first receptacle in line it takes all of the abuse of the whole circuit even if never used.
What should be done is the same as with the ground wires. Take a 6" - 8" piece of black wire, with a wire nut tail it to the two black wires in the box, do the same with the white wires. Now connect the other end of the tails to the receptacle, the power can now flow on the wires past the receptacle, and any others in the line also tailed in this manner to its desired location. Now the receptacles throughout the house will only be in use when something is plugged into each if them, and it will only carry its own load.
Hope I was able to make this clear, will see if I can still find the pictures I took when I posted this on the other site.
Found the pics, apologize for thread jacking.
Things you will need.
What you will typically see.
Wires removed from receptacle, tailed, then reconnected using the two tails.
Wire nuts installed, ready to put back in use.
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