Conduit bends, Not to exceed 360 Degree

[Fordean]

I was always under impression, Not to exceed 360 before pullbox or such,

But I was Demo'ing a conduit, Needed to "Remove back to Source" Run was 200 feet and zig zag like crazy cause of the Existing equipment they had to deal with to obtain the run. ( They definitely had to zig zag).
So I now have to pull wires out. I had to make sure in this run their was no pullbox or anything. So I follow the line down one floor across 200 feet and up 1 floor. Make it known it had No Pull boxes. It was one run. So I was just curious on the Degree count. It came out to 970 degrees with no pull box. It worked. Pulled in, and out. Is this legal. I would rather no put pull boxes in anyway, Just so I can point to point pull.

Was amazed at that degree count

 

[qcroanoke]

I was always under impression, Not to exceed 360 before pullbox or such,

But I was Demo'ing a conduit, Needed to "Remove back to Source" Run was 200 feet and zig zag like crazy cause of the Existing equipment they had to deal with to obtain the run. ( They definitely had to zig zag).
So I now have to pull wires out. I had to make sure in this run their was no pullbox or anything. So I follow the line down one floor across 200 feet and up 1 floor. Make it known it had No Pull boxes. It was one run. So I was just curious on the Degree count. It came out to 970 degrees with no pull box. It worked. Pulled in, and out. Is this legal. I would rather no put pull boxes in anyway, Just so I can point to point pull.

Was amazed at that degree count

No, 360 degrees maximum.
I would like to know how they got a fish tape through it.

 

[HackElectric]

I would rather no put pull boxes in anyway, Just so I can point to point pull.

You can insert a box, trough, or C-Condulet anywhere in the run and still pull thru it. You don't have to pull a loop out of it.

 

[Fordean]

No, 360 degrees maximum.
I would like to know how they got a fish tape through it.

You tie a plastic bag to String. And SHop vac at other end. Goes thru like 4 seconds.

 

[HackElectric]

You tie a plastic bag to String. And SHop vac at other end. Goes thru like 4 seconds.

970 degrees with set screw style couplings, 4 seconds??

 

[infinity]

A C type conduit body doesn't help much with larger conductors and 360? compliance.

 

[Fulthrotl]

970 degrees with set screw style couplings, 4 seconds??

shhh... no.... :happyno: if you're vewy, vewy quiet, you can hear
the "psst" of 30 couplings ruining your day.....

but pulling feeders with simpull does change a lot of
things.... i'll put a C condulet in every four corners,
and pull thru..... i've yet to find any length or number
of 90's that it won't pull thru, without even hitting
500# on the strain gage on the tugger.

 

[Fordean]

970 degrees with set screw style couplings, 4 seconds??

Yes Exaggerated. But the Bag does move fast. With Set screw. Their is leakage. But bag has very minor resistance. Almost a Static cling effect.

 

[chris kennedy]

IMO 360? is a stupid rule. Not the first to say this. Should be based on pull calcs.

 

[HackElectric]

IMO 360? is a stupid rule. Not the first to say this. Should be based on pull calcs.

That would be absolutely horrible. We can't even get inspectors to understand basic code, never mind calculations.

The last thing I need is to have to spend more time doing calculations just to do a pipe run. Even worse would be justifying every run to an inspector.

 

[winnie]

The last thing I need is to have to spend more time doing calculations just to do a pipe run. Even worse would be justifying every run to an inspector.

Ideal would be something along the lines of 310.15(B) or (C) where you get to choose between a (relatively) simplified rule _or_ running the calculations (possibly with an engineer's stamp).

There are probably zillions of situations where exceeding 360 degrees of bend would be just fine, and some subset of these would be worth the extra calculation effort.

-Jon

 

[K8MHZ]

[/COLOR]
You can insert a box, trough, or C-Condulet anywhere in the run and still pull thru it. You don't have to pull a loop out of it.

Anywhere so long as they are accessible. That leaves out a few places.

 

[K8MHZ]

Ideal would be something along the lines of 310.15(B) or (C) where you get to choose between a (relatively) simplified rule _or_ running the calculations (possibly with an engineer's stamp).

There are probably zillions of situations where exceeding 360 degrees of bend would be just fine, and some subset of these would be worth the extra calculation effort.

-Jon

How about like they do it for grounding? The 360 rule unless you can prove that the pull will be less than 25 lbs. per strand. Or something like that.

 

[ActionDave]

A C type conduit body doesn't help much with larger conductors and 360? compliance.

Huh? What else do you use a c condulet for?

 

[ActionDave]

shhh... no.... :happyno: if you're vewy, vewy quiet, you can hear
the "psst" of 30 couplings ruining your day.....

but pulling feeders with simpull does change a lot of
things.... i'll put a C condulet in every four corners,
and pull thru..... i've yet to find any length or number
of 90's that it won't pull thru, without even hitting
500# on the strain gage on the tugger.

I'm gonna pass that info on. We are very old fashioned at our shop, only pull by hand.

If we end up going a couple of days and not getting anywhere the boss will break down and rent his neighbour's mule.

 

[infinity]

A C type conduit body doesn't help much with larger conductors and 360? compliance.

Huh? What else do you use a c condulet for?

Conduit bodies are required to be size according to the 6X and 8X pull box rules in Article 314 when the conductors are #4 and larger. A standard C condulet does not comply with the 8X rule and therefore in most cases it cannot be used to comply with the 360? of bend requirement.