feeder

Status
Not open for further replies.
M

mannyb

Senior Member
Location
Florida
Occupation
Electrician
if a feeder cant be pulled it entire length in one pull because of j boxes or whatever reasons. can you splice a feeder?
 
As Bob said specs may disallow, but feeders are commonly spliced for a variety of reasons.

Distance, location and type of pull box, and others.

In a perfect world you would not, but you do what you gotta do.
 
mannyb said:
if a feeder cant be pulled it entire length in one pull because of j boxes or whatever reasons. can you splice a feeder?
Click to expand...


You can however it would be better to pull to the j-box, pull the wire out, then re-feed it down the rest of the conduit than to splice it. If you have >360* of bend and know you will need a pull box or two, it's better to size larger than needed by code and put it in an optimal spot rather than having it in a harder-to-access place. Splices are time consuming and expensive and introduce another potential failure point.

Not a feeder, but having pulled loads of comm cable, I can tell you it's a pita to pull wire thru 4 floors and potentially a dozen 90s free run (no conduit) thru wood framed buildings. however splicing all of that at a midpoint, if even possible, would be extremely labor intensive, more so than having to go to each pull point and pull 20-30' of wire at a time, move to the next, pull the slack there, rinse, repeat x up to 300'.

The only time I can think of when splicing a feeder may be advantageous is when you are right on the edge of ampacity and wire sizes, when using 90* rated splices would allow using the 90* table and smaller wire than the 75* column.
 
I'm just curious in what scenario would a spec ever say that you cannot splice a feeder?
 
infinity said:
I'm just curious in what scenario would a spec ever say that you cannot splice a feeder?
Click to expand...

Not a job spec, but does the NEC allow splices in feeders if there are multiple sets? Could you splice, say, one set out of 4, or does that make them electrically dissimilar?

I could see someone not wanting splices in feeders due to that, or the increased cost/decreased reliability.
 
JFletcher said:
Not a job spec, but does the NEC allow splices in feeders if there are multiple sets? Could you splice, say, one set out of 4, or does that make them electrically dissimilar?

I could see someone not wanting splices in feeders due to that, or the increased cost/decreased reliability.
Click to expand...

If you had multiple sets why would you splice only one?
 
JFletcher said:
Here's a link to that section:

http://www.electricallicenserenewal...ation-Courses/NEC-Content.php?sectionID=245.0

That exception, to use smaller wire using the 90* column, between two 90* terminations, is not really new. I know I have seen MH graphics on that long before the 17 NEC was written. Calculating the continuous/non-continuous part may be the new part?
Click to expand...

In the 2017 NEC, this remains unchanged. What has changed is the location of the exceptions. They have been relocated to just behind 215.2(A)(1)(a) to make it clear that they do not apply to 215.2(A)(1)(b) at all.
Click to expand...

Now i 'get it', thank you JF!

~RJ~
 
infinity said:
If you had multiple sets why would you splice only one?
Click to expand...

Supply house cut it short (their error, they got the wrong dimensions from you, etc), the pull head got damaged, conduit was a tad longer than measured, etc.. there's a few reasons one set or wire might have to be spliced. If you had to pull 6 sets of 500 MCM, and it was 162' from termination to termination, how long would you order your wire? or would you try to get all 6 out of a 1000' spool? that's cutting it awfully, perhaps impossibly, close. The last set might wind up short...

romex jockey said:
Now i 'get it', thank you JF!

~RJ~
Click to expand...

You're welcome RJ. ~~
 
Status
Not open for further replies.
Top