grounding emt stub/sleave

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T. COONEY

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We ran 1 in. emt attached to pvc in floor stub to cold water then ran 1 in. emt stub/sleave to building steel installed 3/0 ground wire though emt to cold water clamp then thru to building steel cald weld we did not ground emt we used as a sleave is the emt required to be grounded & if so how would we do now with out remove cald weld & pulling back wire.
 
For GEC installations you have to bond both ends of any metallic raceway, you would be better off to remove all the EMT.

See 250.64(E)

Roger
 
Install a pipe clamp ground at each end of the 1" EMT and run an equal size grounding electrode conductor from the clamps to the the termination points of the enclosed GEC, as per 250.64.E (Bonding shall apply at each end and to all intervening ferrous raceways, boxes, and enclosures between the service equipment and the grounding electrode. The bonding jumper for a grounding electrode conductor raceway or cable armor shall be the same size as, or larger than, the required enclosed grounding electrode conductor. Where a raceway is used as protection for a grounding electrode conductor, the installation shall comply with the requirements of the appropriate raceway article.)
 
we ran 1 in. Emt attached to pvc in floor stub to cold water then ran 1 in. Emt stub/sleave to building steel installed 3/0 ground wire though emt to cold water clamp then thru to building steel cald weld we did not ground emt we used as a sleave is the emt required to be grounded & if so how would we do now with out remove cald weld & pulling back wire.

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i read that first post 3 times, still can't understand it
Allow me:

We ran 1 in. emt attached to pvc in floor stub to cold water then ran 1 in. emt stub/sleave to building steel installed 3/0 ground wire though emt to cold water clamp then thru to building steel cald weld we did not ground emt we used as a sleave is the emt required to be grounded & if so how would we do now with out remove cald weld & pulling back wire.
Translation:

We ran 1" PVC under the floor, and used 1" EMT where it emerged. We ran a 3/0 GEC through this conduit to the cold-water pipe clamp, and then on to building steel in one continuous piece.

The EMT sleeving was not bonded to the conductor. Now that the conductor is installed and welded to building steel, how can we make this compliant without cutting and/or reinstalling the GEC?


My addition: where the EMT joins the PVC, how can that end of the EMT be bonded?
 
Larry,
Sounds like you are putting an end to this Thread.

As an aside,
If this is considered shielding on a GEC system,
then this would be a Faraday shield
(installed to appear as a capacitor to the system),
whose system impedance would decrease as frequency rises
(which would pass high-frequency lightning impules),
and thus this shielding would be connected only at one end of each shielded path.

If both ends were connected,
then the shielding would appear as an inductance in the system,
and would impede high frequency impulses (such as lightning).
This method is used for braided shelding in electronic systems,
for a different purpose than normally encountered in electrical systems.
Cabling for motor controls might be an example of its use.

If the OP's post is not about GEC (see above),
then I think the question/situation is not stated clearly.

I like your comments, BTW.
 
Larry,
Sounds like you are putting an end to this Thread.
Not my intention, I assure you. :smile:

As an aside,
If this is considered shielding on a GEC system,
then this would be a Faraday shield
(installed to appear as a capacitor to the system),
whose system impedance would decrease as frequency rises
(which would pass high-frequency lightning impules),
and thus this shielding would be connected only at one end of each shielded path.

If both ends were connected,
then the shielding would appear as an inductance in the system,
and would impede high frequency impulses (such as lightning).
This method is used for braided shelding in electronic systems,
for a different purpose than normally encountered in electrical systems.
Cabling for motor controls might be an example of its use.
It's not the other way around? :confused:

If the OP's post is not about GEC (see above),
then I think the question/situation is not stated clearly.
In this forum? No way! :wink:

I like your comments, BTW.
If you mean me, thanx. You mean my translation of the OP?
 
Glene77, your thinking way to hard, the OP is describing his GEC installation which consists of it running through sections of EMT.

With that said, if a GEC is run through a ferrous raceway it must be bonded to both ends to negate any "Choke Effect".

Roger
 
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