cable line grounding

amakarevic

Here is how narrow it is

amakarevic

Oops, forgot the photo.

Attached Thumbnails

 

gregzoll

That is how I would do it. In MDU's, and office buildings, the grounding is done inside the structure, not at point of entry. Cables come in through conduit or raceway, then get bonded to structure ground at the closet, or place of demarc inside the structure.

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amakarevic

How do I clamp connect a single wire coming into the panel? It is too skinny for a 3/8" clamp connector, which is designed for 14/2 romax cable or fatter

amakarevic

OK, so i am running the ground green wire solid NM AWG 10 from the 2nd floor through the house into the basement.

2 questions:

1. are there any issues with this wire being tied together with the phone and coaxial cables, which also need to go from the same spot in the 2nd floor into the basement? my concern is whether the surge in the ground wire can damage the other two cables despite the insulations. maybe i am just paranoid...

2. on its way through the 1st floor, this wire will go through an exposed framing area of the washer/dryer alcove. there is an old galvanized steel 1.5" pipe that is used for venting the washer drain pipe to which i can conveniently cable tie the ground and the other two cables. the question is similar to #1, are there any issues with tying a ground wire to a steel pipe (which itself is not connected to the ground) ?

thanks

gregzoll

Yes, you would have a "Floating Ground", and also cause a "Ground Loop", due to the isolated ground.

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amakarevic

yes to what?

gregzoll

Yes to the fact, that if you ground to the pipe that you are thinking about, that is for venting, which is not grounded.

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amakarevic

i am not grounding "to the pipe" -- just **securing** the insulated solid gauge 10 ground wire so it doesn't dangle loose -- on its way to the basement to be grounded into the ground bus bar in the main panel.

so the steel pipe is just for tie to it, much like you would staple the cable to a 2x4 stud...

is this OK and is it OK that this green insulated ground wire be tied up for convenience with the phone and coax cables? my concern is that the high surge from a thunfer strike could fry the other two cables in its proximity despite the insulation on both sides.

thanks

gregzoll

That should be fine. Worst case scenario, if there ever is a lightening strike, and the pipe gets energized, it can burn the insulation on the wire, then continue onwards. I would just probably stick with it attached as best at the top & bottom on wood, or if you can pull a smurf tube or conduit, that may be the better option.

Even if you can not secure, floating in the air along that channel that you are running it in, would not be a problem, due to if there is no way anyone can mess with the wire, and no plans later to run anything else through there, I would not worry.

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amakarevic

oh there is a lot of wood attaching both before and after the pipe attachment.

thanks

rrolleston

It seems it would be nuch easier to install the cable tv wire and grounding block somewhere inside where it's easier to run a ground wire to it. Or install another one inside and leave the other one alone.

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