ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Back From Retirement
by BigB - 08/15/22 08:36 PM
Upside Down ThreeWay
by gfretwell - 08/12/22 12:30 AM
Load Calcs for EVs and RVs
by gfretwell - 08/12/22 12:24 AM
Wiring method choice
by HotLine1 - 08/10/22 03:39 PM
NEC- 314.23 (H) (1)
by renosteinke - 08/10/22 11:13 AM
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
0 members (), 32 guests, and 12 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#92072 02/25/05 06:07 AM
Joined: Jun 2004
Posts: 613
S
Member
When isolated (not continuous between enclosures) sections of metal conduit are used for physical protection of nonmetalic cable,like for a floor penetration for exsample, is it required to be grounded?

Code refrences please.

shortcircuit

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
 

#92073 02/25/05 09:52 AM
Joined: Jan 2004
Posts: 1,507
G
Member
Maybe 250.86 Exception No 2 covers the question.


George Little
#92074 02/25/05 10:38 AM
Joined: Jun 2004
Posts: 613
S
Member
Thanx George Little...and what determines the distance of "short sections"...

For example could I penetrate a plastered wall with romex, enter 30 feet of EMT with bushings on each end and exit the other end and go back into a wall on the other side of the garage without grounding the EMT at all? The EMT would be provideing physical protection of the romex.

shortcircuit

#92075 02/25/05 03:02 PM
Joined: Jul 2004
Posts: 9,718
Likes: 11
G
Member
From a practical sense, the most likely places where a cable could energize the sleeve are the ends, so the length won't change that risk much. If you are talking about the raceway being energized by an unrelated circuit we fall back to the arguments about bonding that steel beam.
(and we don't want to kick that tar baby again)


Greg Fretwell
#92076 02/25/05 05:21 PM
Joined: Jun 2004
Posts: 613
S
Member
gfretwell...I was not thinking so much about the may become energized from the outside, but was thinking what would happen if this EMT providing physical protection were to become damaged itself from a inadvertent impact of some sort and then becoming energized by the circuit it protects.
Guess that I'm reaching again [Linked Image]

shortcircuit

#92077 02/25/05 05:47 PM
Joined: Jul 2004
Posts: 9,718
Likes: 11
G
Member
I guess the real question is how you would bond the raceway to the RX without a box to open up the jacket in.


Greg Fretwell
#92078 02/25/05 08:51 PM
Joined: Dec 2003
Posts: 751
E
Member
The same way we have to bond that steel 90 in the UG service PVC run that isn't 18 inches below grade. With a ground clamp or bushing and a wire to the ground bus in the panel.


Earl

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
Samurai
Samurai
Fl.
Posts: 46
Joined: May 2007
Top Posters(30 Days)
BigB 6
Popular Topics(Views)
295,022 Are you busy
226,690 Re: Forum
211,860 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5