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.
grounding emt stub/sleave
- Thread starter T. COONEY
- Start date
- Status
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.)
stickboy1375
Senior Member
- Location
- Litchfield, CT
Pierre C Belarge
Senior Member
- Location
- Westchester County, New York
How does one do that, when the conductors as per the OP are in a raceway while transitioning from one type of raceway to the next?
stickboy1375
Senior Member
- Location
- Litchfield, CT
pipe clamp?
bullheimer
Senior Member
- Location
- WA
i read that first post 3 times, still can't understand it
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Allow me:
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?
glene77is
Senior Member
- Location
- Memphis, TN
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.
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.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Not my intention, I assure you. :smile:
It's not the other way around?
In this forum? No way! :wink:
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
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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