Using Conduit as Ground
- Thread starter droach
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websparky
Senior Member
- Location
- Cleveland, Ohio
Re: Using Conduit as Ground
Your question is interesting, just that it is too big of a subject to answer simply.
Can you be more specific?
Your question is interesting, just that it is too big of a subject to answer simply.
Can you be more specific?
Re: Using Conduit as Ground
This is really a design/safety issue. If conduit is properly installed and maintained it can be used safely as an EGC for up to about 200 feet from the N-G bond. To me that is a big assumption.
But I like to design a 30 plus yesr design that requires little maintenance so I always use an EGC for maximum safety. Doing this gives you lower overall impedance by using an EGC plus you get the shielding of the conduit.
This is really a design/safety issue. If conduit is properly installed and maintained it can be used safely as an EGC for up to about 200 feet from the N-G bond. To me that is a big assumption.
But I like to design a 30 plus yesr design that requires little maintenance so I always use an EGC for maximum safety. Doing this gives you lower overall impedance by using an EGC plus you get the shielding of the conduit.
Re: Using Conduit as Ground
I will be conducting a class and would like to present the pro and con of this method of grounding. As for myself I would rather pull an Equipment Grounding Conductor and not worry about if the conduit was installed wrench tight with the proper fittings.
I will be conducting a class and would like to present the pro and con of this method of grounding. As for myself I would rather pull an Equipment Grounding Conductor and not worry about if the conduit was installed wrench tight with the proper fittings.
alex winkler
Member
Re: Using Conduit as Ground
The IAEIs "Soares Book On Grounding" has some good information on this subject. It is based in part from a study done at the Georgia Institute of Technology.
The IAEIs "Soares Book On Grounding" has some good information on this subject. It is based in part from a study done at the Georgia Institute of Technology.
joe tedesco
Senior Member
- Location
- Boston, Massachusetts
Re: Using Conduit as Ground
The Georgia Tech research studies on which the GEMI program is based are included on the disc. This research, plus full-scale testing, provided real-world measurements from which software designers developed the Free copies of the new Windows version of the GEMI software are available to designers, engineers and other electrical professionals from the Steel Tube Institute.
http://www.steelconduit.org/download/gemi-install.exe
http://www.steelconduit.org/pdf/gemivol1.PDF
http://www.steelconduit.org/pdf/groundingpart1.PDF
[ August 28, 2003, 08:22 PM: Message edited by: joe tedesco ]
The Georgia Tech research studies on which the GEMI program is based are included on the disc. This research, plus full-scale testing, provided real-world measurements from which software designers developed the Free copies of the new Windows version of the GEMI software are available to designers, engineers and other electrical professionals from the Steel Tube Institute.
http://www.steelconduit.org/download/gemi-install.exe
http://www.steelconduit.org/pdf/gemivol1.PDF
http://www.steelconduit.org/pdf/groundingpart1.PDF
[ August 28, 2003, 08:22 PM: Message edited by: joe tedesco ]
karl riley
Senior Member
Re: Using Conduit as Ground
Here's a question: I worked with a local electrician at a school to correct some errors.The conduits were the GECs. The main errors were the bonding of N/G at subpanels, sending neutral all over the building. We disconnected the bonds.
The inspector disallowed this and ordered the bonds reconnected. He said it was an old building and he didn't trust the conduits. He refused to test the conduits. This was some years ago, but any opinions on this ruling?
Karl
Here's a question: I worked with a local electrician at a school to correct some errors.The conduits were the GECs. The main errors were the bonding of N/G at subpanels, sending neutral all over the building. We disconnected the bonds.
The inspector disallowed this and ordered the bonds reconnected. He said it was an old building and he didn't trust the conduits. He refused to test the conduits. This was some years ago, but any opinions on this ruling?
Karl
websparky
Senior Member
- Location
- Cleveland, Ohio
Re: Using Conduit as Ground
Hi Karl,
I would think creating a parallel path would be more of a hazard. I think my choice would have been to remove the jumpers and install separate ground rods.
Dave
[ August 28, 2003, 10:10 PM: Message edited by: websparky ]
Hi Karl,
I would think creating a parallel path would be more of a hazard. I think my choice would have been to remove the jumpers and install separate ground rods.
Dave
[ August 28, 2003, 10:10 PM: Message edited by: websparky ]
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