ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
600 KW 120/208 3 Phase Y protection
by gfretwell. 07/20/17 01:02 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,172 Are you busy
174,562 Re: Forum
166,994 Need opinion
Who's Online Now
0 registered members (), 35 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#115916 - 01/05/04 11:18 PM Rusty Conduit  
Admin  Offline

Administrator
Member
Joined: Oct 2000
Posts: 3,447
NY, USA
[Linked Image]
Quote
Rusty Conduit On the Floor in a Machine Shop

- Joe Tedesco


Tools for Electricians:

#115917 - 01/06/04 07:22 PM Re: Rusty Conduit  
walrus  Offline
Member
Joined: Jul 2002
Posts: 680
Bangor Me. USA
Whats the big deal about a rusty conduit??. Should it be replaced because its rusty??


#115918 - 01/06/04 11:18 PM Re: Rusty Conduit  
richard  Offline
Member
Joined: Aug 2003
Posts: 95
L.I. New York
most times, the conduit is the grounding conductor, for one


#115919 - 01/07/04 12:13 AM Re: Rusty Conduit  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
Richard picked up on the obvious that could become a problem if the conduit was called upon to serve as the EGC.

What was interesting about this conduit is that it was so thin that you could poke a screwdriver into it!


Joe Tedesco, NEC Consultant

#115920 - 01/07/04 07:49 AM Re: Rusty Conduit  
walrus  Offline
Member
Joined: Jul 2002
Posts: 680
Bangor Me. USA
OK. I haven't seen a piece of rigid as a ground for many years. I always pull in a green wire so do all the installs I see


#115921 - 01/07/04 10:33 AM Re: Rusty Conduit  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
walrus:

I think that most industrial and commercial electricians would agree with you, and I too always recommend the installation of an equipment grounding conductor, because of situations like this one, and on rooftops where connectors are pulled loose because of physical damage, and loose connections on EMT.

[Linked Image]

Photo Courtesy: www.codecheck.com


Joe Tedesco, NEC Consultant

#115922 - 01/07/04 12:32 PM Re: Rusty Conduit  
DougW  Offline
Member
Joined: Jun 2003
Posts: 1,143
North Chicago, IL
Quote
What was interesting about this conduit is that it was so thin that you could poke a screwdriver into it!


That just means that it's done! After all, I hate undercooked conduit!


#115923 - 01/07/04 06:03 PM Re: Rusty Conduit  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
Now that you mention it, the rusty stuff really tastes better when it is barbecued over the boiler in about a 150 deg., F, in the lower basement there in the big buildings downtown ..

I could tell you some stories about that type of food!!


Joe Tedesco, NEC Consultant

#115924 - 01/07/04 09:01 PM Re: Rusty Conduit  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
The machine-shop rusty conduit is proof the machinists have swapped nitric acid for cutting oil.




[This message has been edited by Bjarney (edited 01-07-2004).]


#115925 - 01/12/04 05:36 PM Re: Rusty Conduit  
John Steinke  Offline
Member
Joined: Apr 2001
Posts: 518
Reno,Nv., USA
Actually, most machine shops use a water-based cutting fluid these days.
While code requires that materials be suitable for the environment in which they're used, it doesn't spell out that you have to consider corrosion- so this is something often overlooked.
Nor does the code address maintenance issues; this picture, like many others on this site, shows the effects of time and abuse on the installation.

On the plus side, modern electronics -such as those that control machines- often won't work right if the ground is poor. This may result in better maintenance (I hope). Too often, the installer is the last competent party to see the machine, until something breaks.



Member Spotlight
Grover
Grover
Sebago, ME, USA
Posts: 109
Joined: January 2005
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.015s Queries: 14 (0.003s) Memory: 0.8084 MB (Peak: 0.9859 MB) Zlib enabled. Server Time: 2017-07-21 04:39:44 UTC