ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
May I backfeed 3 phase transformer?
by dsk - 10/22/21 04:37 AM
Wire sizing
by gfretwell - 10/21/21 10:12 PM
GFCI's pops in large numbers
by dsk - 10/21/21 02:03 AM
Need some info on Japanese outlets, 200V 15A
by andey - 10/20/21 08:05 AM
nec 110.3 (B)
by watersparkfalls - 10/19/21 07:09 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
1 members (Scott35), 16 guests, and 17 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#47396 01/14/05 11:05 PM
Joined: Feb 2001
Posts: 159
C
CRW Offline OP
Member
If the NPT thread taper for conduit is 3/4" per foot, what would happen if you ran out threads for 2 feet on a piece of 3/4" inch conduit?

#47397 01/15/05 01:01 AM
Joined: Nov 2000
Posts: 2,148
R
Member
You have a long section of straight threads. Only the end of the threaded section will have any taper.
Don


Don(resqcapt19)
#47398 01/15/05 01:04 AM
Joined: Apr 2003
Posts: 5
C
Junior Member
If you were to do this you would have 23 and 3/4 inches with no taper and the last 3/4 inch of thread would have 3/4 inch per foot taper.It would be very weak and easy to break and if used a violation of 344.42(b).

#47399 01/15/05 06:48 AM
Joined: Jan 2003
Posts: 4,391
I
Moderator
Welcome to ECN CANMAN. [Linked Image]

Quote
if used a violation of 344.42(b).

That is true only if used with a coupling, you could make an 'all thread' nipple to be used with locknuts.

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#47400 01/15/05 07:22 AM
Joined: Apr 2003
Posts: 5
C
Junior Member
Thanks Bob,I agree that you could make an all thread but I do not believe that the all thread would meet the requirements of 344.28.In other words it would not have the required taper,I have seen it done before though so you have a very good point.


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
mxslick
mxslick
Atomic City, ID USA
Posts: 806
Joined: October 2004
Top Posters(30 Days)
dsk 7
Popular Topics(Views)
284,754 Are you busy
217,367 Re: Forum
203,709 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5