Bare Ground in EMT? - Page 2 - Electrician Talk - Professional Electrical Contractors Forum

macmikeman · 10-15-2009, 09:43 AM

The code addresses bonding both ends of metal conduit containing the grounding electrode conductor not equipment grounds. It don't make a single bit of difference if that wire is insulated or not. As far as having to have insulation on equipment grounding wires in conduit, there is no code about it and I bet no UL listing issue either. (I am going to check on that, I'll get back to you).

macmikeman · 10-15-2009, 09:58 AM

Ok I'm back. All clear on the UL white book front- no mention of any requirements to have to use insulated wire for equipment grounding in aluminum conduits rigid or emt. Power trip.

pjmurph2002 · 10-15-2009, 10:07 AM

"So the point is when properly installed there is no issue, if you cannot properly install it hang drywall.”

Exactly!!

macmikeman · 10-15-2009, 10:36 AM

Quote:

Originally Posted by pjmurph2002

"So the point is when properly installed there is no issue, if you cannot properly install it hang drywall.”

Exactly!!

And a note for the original Florida 'AHJ" subject of this thread -
if you cannot properly interpret it, change your title to " Idiot having jurisdiction", and hang drywall.”[/font][/color]

jdomain · 10-18-2009, 12:03 PM

Quote:

Originally Posted by brian john

So what happens when one the hack electricians leaves the copper connection loose? The argument some use of loose connections can be applied to any thing we do. I say if that is the quality of work you do or are use to sub it all out to professionals.

I can argue that all wiring should be in rigid for the same reason. A hack electrician improperly installs NM and nicks the insulation, better use rigid.

So the point is when properly installed there is no issue, if you cannot properly install it hang drywall.

I dig it Bro. Can't do it right? I got a ditch need diggin'...

mcclary's electrical · 10-18-2009, 12:19 PM

Quote:

Originally Posted by jdomain

I dig it Bro. Can't do it right? I got a ditch need diggin'...

Is this english?

RIVETER · 11-02-2009, 10:08 PM

Quote:

Originally Posted by raider1

If you bond both ends of the conduit to the GEC then you are OK. (See 250.64(E))

It is better to use a non-ferrous raceway to enclose the GEC such as schedule 80 PVC.

Chris

I agree here, it would be better to use a non-ferrous conduit, but conduit, if used, must have the appropriate BONDING devices at both ends to prevent the possibility of an INDUCTIVE CHOKE being set up, which, as I understand, could, possibly IMPEDE the flow of FAULT current...the overload device would take longer to trip.

te12co2w · 11-03-2009, 09:14 AM

Is it a mobile home? If so, then 550-33 applies.

raider1 · 11-03-2009, 11:58 AM

Quote:

Originally Posted by RIVETER

I agree here, it would be better to use a non-ferrous conduit, but conduit, if used, must have the appropriate BONDING devices at both ends to prevent the possibility of an INDUCTIVE CHOKE being set up, which, as I understand, could, possibly IMPEDE the flow of FAULT current...the overload device would take longer to trip.

The grounding electrode and the grounding electrode conductor do not have anything to do with actuating an overcurrent device.

You are correct that if you don't bond both ends of a GEC to a ferrous metal enclosure that you can ge an inductive choke effect. But this occurs when lightning current flows through the grounding electrode system to the earth. The choke effect can cause the lightning induced currents in the electrical system to try to find other paths into the earth rendering the grounding electrode system useless.

Chris

John Valdes · 11-03-2009, 02:10 PM

Quote:

Originally Posted by Thomp

I was taught not to do this because the conduit would act as a choke and inhibit the path to ground.

I was told that too when I was an apprentice and did not know any better. It may have some merit theoretically, but it is allowed and a common way to install the GEC.

BigCL · 11-03-2009, 03:53 PM

So would Sch. 80 PVC or IMC be a better way to get the Ground Electrode Conductor/ Ufer to the 3rd floor 17kv substation?

raider1 · 11-03-2009, 05:59 PM

Quote:

Originally Posted by BigCL

So would Sch. 80 PVC or IMC be a better way to get the Ground Electrode Conductor/ Ufer to the 3rd floor 17kv substation?

IMHO, Sch 80 PVC would be the way to go.

Chris

nolabama · 11-03-2009, 09:16 PM

Quote:

Originally Posted by mcclary's electrical

Is this english?

I dig it Bro. Can't do it right? I got a ditch need diggin'...

please allow me to interpret this from redneck - a language that im fluent in to regular english

i dig it bro - means he understands the previous posters comment

cant do it right - means - if your a hack

i got a ditch need diggin' -means- sir might i suggest a general labor job for you

jdomain · 11-05-2009, 06:29 PM

Quote:

Originally Posted by nolabama

I dig it Bro. Can't do it right? I got a ditch need diggin'...

please allow me to interpret this from redneck - a language that im fluent in to regular english

i dig it bro - means he understands the previous posters comment

cant do it right - means - if your a hack

i got a ditch need diggin' -means- sir might i suggest a general labor job for you

precisely