How many bends in a run of conduit?

Status
Not open for further replies.
egurdian3 said:
Hey Guys, by force of habit, I can't remember ever allowing more than (3) 90s, within 100', on a run of conduit without a pullbox.
Where is this in the NEC?
Click to expand...

The NEC officially limits you to no more than 360 degrees worth of bends, NEC 346-11. I.e. 4 qty standard 90 degree turns.

There is no official limit of length, or limit on configuration of lengths among the bends. It is up to your pulling tension calculations to determine if a pull is possible. Granted, it is possible to pull through 5 consecutive 90 degree factory elbows, but the chance that this happens in practice is rare. So in anticipation of it being impractical to pull in most cases, the NEC limits you to a total of 360 degrees between access points.
 
Carultch said:
The NEC officially limits you to no more than 360 degrees worth of bends, NEC 346-11. I.e. 4 qty standard 90 degree turns.

There is no official limit of length, or limit on configuration of lengths among the bends. It is up to your pulling tension calculations to determine if a pull is possible. Granted, it is possible to pull through 5 consecutive 90 degree factory elbows, but the chance that this happens in practice is rare. So in anticipation of it being impractical to pull in most cases, the NEC limits you to a total of 360 degrees between access points.
Click to expand...

Thanks!
 
Smart $ said:
I agree with Derek's negligible ...IF... the offset is less than the diameter of the conduit or thereabouts.
Click to expand...


+1 on that.

less than the thickness of the conduit.

now, if you are bending box offsets in 4" conduit,
you can put as many 90's in the run as you want,
as anyone who can bend box offsets in 4" can pull
anything.... with their teeth.
 
Fulthrotl said:
+1 on that.

less than the thickness of the conduit.

now, if you are bending box offsets in 4" conduit,
you can put as many 90's in the run as you want,
as anyone who can bend box offsets in 4" can pull
anything.... with their teeth.
Click to expand...

This bender can bend a box offset in 4"

 
Fulthrotl said:
now, if you are bending box offsets in 4" conduit, you can put as many 90's in the run as you want,
as anyone who can bend box offsets in 4" can pull anything.... with their teeth.
Click to expand...

This describes Chuck Norris to a tee. He bends the offsets with his hands and pulls wire with his teeth. There are no degree limits when Chuck is running conduit. Chuck could bend an offset in that bending machine too (Not the pipe in the machine, the machine itself.)
 
Coppersmith said:
This describes Chuck Norris to a tee. He bends the offsets with his hands and pulls wire with his teeth. There are no degree limits when Chuck is running conduit. Chuck could bend an offset in that bending machine too (Not the pipe in the machine, the machine itself.)
Click to expand...

:D

Meme true, but try pulling catx or coax thru a raceway that has more than 4 quarter bends between pull points... it doesn't end well. Even 4 bends can be impossible if the right (wrong) combination of bends, distance, and cables are involved, hence the TIA/EIA recommendations for v/d/v.
 
Status
Not open for further replies.
Top