Conduit Lengths

Status
Not open for further replies.
A

Alwayslearningelec

Senior Member
Location
NJ
Occupation
Estimator
BJ Conner said:
I think most of the PVC conduit I have see is 20' even 3/4" is available in 20' lengths. Not much of it at Home Depot.

Rigid and EMT is available in 20' lengths. I don't think the small sizes are and the larger sizes are not common ( I haven't tried to find any lately so I don't know how handy it is.). It probably has to come from China now days.
IF you have ever used long radius GRS sweeps you know that someone had to strar with a piece longer than 10' to make them.
I have seen duct banks where the eingineer wanted some of the ducts as GSR. 20' lengths were what we used. We used enough to make it worthwile to track some down.
20' Sticks of GRS can be good in a vertical installation, like goig up a shaft. YMMY.
Fiberglass conduit comes in 20' lengths.
Stainless steel conduit comes it 10' lenghts. One vendor offered it in 5' lenths. Probably because it's expensive.
If have a job with lots of conduit it might pay to check with your vendors to see what they have.
IF you have a GF or electrican that knows conduit bring him in on the the planning.
A man that has run miles and miles of conduit is to valuable to ignore. :roll:
Click to expand...

Very Very informative. THanks.
 
C

cdslotz

Senior Member
20' EMT is pretty pricey if I recall. Although it's been a while, I have run the numbers. You really need long, straight, multiple feeders to make it pay off. That's why 20' PVC makes sense in more applications.

Be careful with those integral couplings on EMT. Some specs don't allow them.
 
B

BJ Conner

Senior Member
Location
97006
HDPE Conduit

HDPE Conduit

HDPE conduit come's in reels. I think the only limit on how big the reel can be is the height of overpasses between the facotry and your job.
I has a memory so if you unspool it when cold you may just have a coil of it till spring. It can be hard to put where you want it. I have never worked with itin real cold weather.
It's slick, cable pulls very easy. In fact we had a cable pusher that would push 1/0 15 kV cable 2 blocks.
Couplings are bad news - the ones we used were thermal fusion. They have fine wire in them and the machine to melt the couplings onto the conduit. It was about $12,000, the couplings were about $50.
Any glue that will glue Polyethelyne will kill you. There are other mechanical fasteners but I haven used them.

The stuff comes in red ( electric), orange ( communications), yellow (gas ) and a couple of other colors.
 
B

BJ Conner

Senior Member
Location
97006
BJ Conner said:
HDPE conduit come's in reels. I think the only limit on how big the reel can be is the height of overpasses between the facotry and your job.
I has a memory so if you unspool it when cold you may just have a coil of it till spring. It can be hard to put where you want it. I have never worked with itin real cold weather.
It's slick, cable pulls very easy. In fact we had a cable pusher that would push 1/0 15 kV cable 2 blocks.
Couplings are bad news - the ones we used were thermal fusion. They have fine wire in them and the machine to melt the couplings onto the conduit. It was about $12,000, the couplings were about $50.
Any glue that will glue Polyethelyne will kill you. There are other mechanical fasteners but I haven used them.

The stuff comes in red ( electric), orange ( communications), yellow (gas ) and a couple of other colors.
Click to expand...

IT has a memory, I kind of do but it is starting to go.
 
Status
Not open for further replies.
Top