ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
How's Florida doing with Hurricane Ian?
by Bill Addiss - 09/28/22 12:41 PM
Tough being a lineman's kid
by Bill Addiss - 09/28/22 12:39 PM
GFCI's pops in large numbers
by dsk - 09/26/22 04:35 AM
AFCI’s Revisited
by sparky - 09/24/22 09:58 AM
NFPA Price Increase Coming
by Bill Addiss - 09/23/22 02:22 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
1 members (Scott35), 12 guests, and 16 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
Joined: Oct 2000
Posts: 2,749
Member
[Linked Image]

In Arizona doesn't seem to withstand the effects of the earth?

What does UL have to say about this and does the NEC cover this situation?



[This message has been edited by Joe Tedesco (edited 03-07-2005).]


Joe Tedesco, NEC Consultant
Stay up to Code with the Latest NEC:


2020 NEC & Related Reference & Study Guides
2020 NEC & Related Reference & Study Guides
Pass Your Exam the FIRST TIME with these Exam Prep Combos:
 

>> Master Electrician Exam Prep     >> JourneyMan Electrician Exam Prep
 

Joined: Aug 2001
Posts: 7,520
P
Member
That looks bad, especially for a dry climate like Arizona. Or is this the result of galvanic action of some kind?

By the way, what's the usual thickness of the metal used for EMT?

Joined: Jan 2003
Posts: 4,391
I
Moderator
Paul, EMT is roughly the same as the exhaust pipe on a car.

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Joined: Nov 2002
Posts: 174
K
Member
EMT wall thickness runs from 0.042 for 1/2 inch to .083 for 4 inch.

Compare that to Rigid Steel which runs from .104 to .225.

BTW IMC runs from .070 to .140.

Joined: Aug 2001
Posts: 7,520
P
Member
Thanks. There was some thinwall conduit used in the U.K. in the past, but nowadays we don't really have an equivalent to EMT in general work, just PVC or heavy-gauge steel.

Joined: Aug 2002
Posts: 1,081
T
Member
ARTICLE 358
Electrical Metallic Tubing: Type EMT

358.10 Uses Permitted.
...
(B) Corrosion Protection. Ferrous or nonferrous EMT, elbows, couplings, and fittings shall be permitted to be installed in concrete, in direct contact with the earth, or in areas subject to severe corrosive influences where protected by corrosion protection and judged suitable for the condition.
(C) Wet Locations. All supports, bolts, straps, screws, and so forth shall be of corrosion-resistant materials or protected against corrosion by corrosion-resistant materials.

358.12 Uses Not Permitted. EMT shall not be used under the following conditions:
(1) Where, during installation or afterward, it will be subject to severe physical damage
(2) Where protected from corrosion solely by enamel
...
(6) Where practicable, dissimilar metals in contact anywhere in the system shall be avoided to eliminate the possibility of galvanic action
Exception: Aluminum fittings and enclosures shall be permitted to be used with steel EMT where not subject to severe corrosive influences.

Joined: Jul 2003
Posts: 394
B
Member
It looks like it may be "lava rock" around those pieces. If so, I have found that lava rock is very corosive, even to galvanized material. I've seen it eat completely through window wells when it was used around the foundation. This may be a location where Suitable for conditions is important.

Joined: Oct 2000
Posts: 2,749
Member
This picture was taken in Las Vegas last year.

[Linked Image]


Joe Tedesco, NEC Consultant
Joined: Apr 2002
Posts: 197
G
Gwz Offline
Member
You're just " nitpicking ".

Joined: Oct 2000
Posts: 2,749
Member
Gwz
continued ....

Define "nitpicking"

How in the heck are you! What's up? Did you send in any Proposals, and did they get accepted?

How about Comments?


Joe Tedesco, NEC Consultant
Page 1 of 2 1 2

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Vlado
Vlado
Croatia
Posts: 28
Joined: February 2011
Top Posters(30 Days)
Popular Topics(Views)
297,769 Are you busy
228,511 Re: Forum
213,342 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5