Email this page to a friend or associate!
  Mike Holt Code Forum
  Archives
  Degrees of bends in a conduit run


register | my profile | faq | archive search

next newest topic | next oldest topic
Author Information Topic:   Degrees of bends in a conduit run
Member

   
Name: Jim O'dell
Email: jim221@earthlink.net
Location: Arizona
Title: Electrician
In Trade Since: 1984
Registered: Jan 2002
Total Posts: 2

posted January 24, 2002 at 05:33 PM       Edit/Delete Message
How many degrees of bend in a conduit does it take to start counting towards the total of 360 degrees allowed in a conduit run? I have a 1' offset in 15'of underground PVC. Does this count towards the total?

IP: 63.14.172.223

Member

   
Name: Grant Rollins
Email: grollins@rexelusa.com
Location: Nevada
Title: Contractor/Distributor
In Trade Since: 1965
Registered: Oct 2001
Total Posts: 449

posted January 24, 2002 at 05:36 PM       Edit/Delete Message
One degree. Your offset counts.

IP: 12.18.100.210

Member

   
Name: J Habby
Email: jhabby@tricountyi.net
Location: Pennsylvania
Title: Maintenance
In Trade Since: 1984
Registered: May 2001
Total Posts: 137

posted January 24, 2002 at 07:07 PM       Edit/Delete Message
quote:
Originally posted by jim221@earthlink.net:
How many degrees of bend in a conduit does it take to start counting towards the total of 360 degrees allowed in a conduit run? I have a 1' offset in 15'of underground PVC. Does this count towards the total?

Not fully understanding your question but one offset, if bent with 45's would be 90 towards the total, or with 22's would be 44 towards the total. Any and all bends count.Does that help?

IP: 208.155.122.42

Member

   
Name: Jim O'dell
Email: jim221@earthlink.net
Location: Arizona
Title: Electrician
In Trade Since: 1984
Registered: Jan 2002
Total Posts: 2

posted January 24, 2002 at 09:17 PM       Edit/Delete Message
The pipe follows the trench, which has a 1' offset in fifteen feet. I don't need to heat the pipe or use factory fitting. The trench is 1' wide. Does that clear it up alittle. So when running EMT, you have to count your box offsets?

IP: 63.14.218.12

Member

   
Name: J Habby
Email: jhabby@tricountyi.net
Location: Pennsylvania
Title: Maintenance
In Trade Since: 1984
Registered: May 2001
Total Posts: 137

posted January 24, 2002 at 10:53 PM       Edit/Delete Message
348-10 States not more then the equivilent of 4 90degree bends (360) in one conduit run.Box offsets, Yuppers.
quote:
Originally posted by jim221@earthlink.net:
The pipe follows the trench, which has a 1' offset in fifteen feet. I don't need to heat the pipe or use factory fitting. The trench is 1' wide. Does that clear it up alittle. So when running EMT, you have to count your box offsets?

IP: 208.155.122.42

Member

   
Name: Peter Michael
Email: pmichael@tns.net
Location: California
Title: Electrician
In Trade Since: 1997
Registered: Jan 2002
Total Posts: 12

posted January 24, 2002 at 11:45 PM       Edit/Delete Message
One foot in fifteen doesn't sound like much to me.The real killer in bending is those 90 bends.
-Peter

IP: 216.86.140.228

Member

   
Name: Andre Michalik
Email: amichalik@msn.com
Location: Illinois
Title: Electr. engineer, instructor, cert. inspector
In Trade Since: 1985
Registered: Jan 2002
Total Posts: 545

posted January 25, 2002 at 12:30 AM       Edit/Delete Message
Where offset is larger than pipe diameter, pulled wire create friction force. The total friction force grows expotentially. May be it is not easy understand, but it is mechanical rule.
E.g. 10 powered 3 is 1000, but 10 powered (3+1) makes 10,000. Small friction force added somewhere can add tons to final pulling force.
Another example: a sailor can not hold a ship with a rope turns the rope ones over a pole, but it is very easy to stop the ship turning the rope twice.
Andre

IP: 199.182.172.118

Member

   
Name: hank arimas
Email: we-wood@worldnet.att.net
Location: Illinois
Title: electrician
In Trade Since: 1996
Registered: Jun 2001
Total Posts: 87

posted January 25, 2002 at 08:26 AM       Edit/Delete Message
Jim, if you look at 348.12 1999 code it mentions the equvalent of all bends not to exceed 360 between pull points. I believe that includes offsets.

Hank,

IP: 12.84.7.98

Member

   
Name: Don Ganiere
Email: resqcapt19@aol.com
Location: Illinois
Title: Electrician
In Trade Since: 1973
Registered: Jan 2002
Total Posts: 1061

posted January 25, 2002 at 09:50 AM       Edit/Delete Message
Not only does it include offsets, it includes that bends that result from an uneven bottom in the ditch.
Don(resqcapt19)

IP: 64.133.97.147

Member

   
Name: Tom Baker
Email: tom@psetraining.com
Location: Washington
Title: Instructor
In Trade Since: 1978
Registered: Apr 2001
Total Posts: 1274

posted January 26, 2002 at 08:50 PM       Edit/Delete Message
If you are counting box offsets then you are cutting it too close.

Why fight it? 3 90 degree bends is a good limit.

IP: 12.82.160.106

All times are EST (US)

next newest topic | next oldest topic

  

Contact Us | Mike Holt Enterprises, Inc.