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Rusty Conduit #115916 01/05/04 11:18 PM
Joined: Oct 2000
Posts: 3,631
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[Linked Image]
Quote
Rusty Conduit On the Floor in a Machine Shop

- Joe Tedesco

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

Re: Rusty Conduit #115918 01/06/04 11:18 PM
Joined: Aug 2003
Posts: 99
richard Offline
Member
most times, the conduit is the grounding conductor, for one

Re: Rusty Conduit #115919 01/07/04 12:13 AM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline
Member
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
Re: Rusty Conduit #115920 01/07/04 07:49 AM
Joined: Jul 2002
Posts: 680
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walrus Offline
Member
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

Re: Rusty Conduit #115921 01/07/04 10:33 AM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline
Member
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
Re: Rusty Conduit #115922 01/07/04 12:32 PM
Joined: Jun 2003
Posts: 1,143
D
DougW Offline
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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!

Re: Rusty Conduit #115923 01/07/04 06:03 PM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline
Member
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
Re: Rusty Conduit #115924 01/07/04 09:01 PM
Joined: Apr 2002
Posts: 2,527
B
Bjarney Offline
Moderator
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).]

Re: Rusty Conduit #115925 01/12/04 05:36 PM
Joined: Apr 2001
Posts: 518
J
John Steinke Offline
Member
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.


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