I would appreciate any guidance on splicing a shallow direct-bury cable
that feeds an outdoor 120v lighting fixture.
The wire got cut in two places by a backhoe. (This was not a surprise
- the lines weren't marked, their route wasn't obvious and the hand dig
would have cost a fortune.)
My current plan is as follows. Please ding me if I've missed
1. Hand dig trench about one foot deep
2. Cut old cable back to non-backhoe-damaged section and strip
3. Cut two new sections of two conductor plus ground cable
4. Two new sections times two splices = four (4) splices
5. Seal splices against moisture with [not sure] (Heat-shrink?
6. Drop mended cable in trench
7. Fill trench half way
8. Mark trench with [not sure] (Tape? 2x4?)
9. Complete fill of trench
I've used epoxy potted splices and have seen adds for direct bury
wirenuts but never used one.
Looking for further information, it looks like King direct bury is CSA
[Canadian] rated but not UL
Ideal is UL listed for direct burial
I am a little surprised UL doesn't want some strain relief and something
to replace the protection provided by the jacket of UF cable.
They sound really easy to use. Had any problems with them?
One common situation I've had is replacing broken or rotten residential lamp
posts. Invariably the existing uf feeder gets destroyed in digging out the
old post. I use these wirenuts in the ground to splice on a new length of
cable to feed into the new post. I've had occasion to replace the new posts
as well, or adding a second fixture in some instances
Thanks to all for the replies. The splices in question were in fact to
feed a light post, but not because the post is rotting.
Since the two cuts were in the middle of a 70 foot underground run, I
decided to hand dig just for the splices down to 18" (about ten feet of
trench), trim the existing UF line back to cable unaffected by the
backhoe and splice in new UF wire using four of the ($11) Ideal UF
splice kits from Home Depot.
Materials cost was about $55 all-in. If the line were crucial, I
probably would have dug the 70' trench and replaced the line
end-to-end. As it is, the line is a seldom-used feed for the lightpole
and nothing else - failure wouldn't be a disaster - so I skipped the
70' hand dig.
In retrospect, I spent much more time cutting, stripping and splicing
the UF cable than I would have hand-digging the trench. I had never
worked with UF before, and managed to give myself a pretty nice gash
with a utility knife before I got the knack of stripping the solid
outer jacket. Lesson: hand-digging a trench to bury cable just doesn't
take that long. If I had done the hand-dig, I would have saved both
time and money and would have a better result in the ground right now.
I may have a chance to check this out later. As I said, I didn't
splice the cable because the lamp post is rotting, I spliced it because
a backhoe hit the cable in two places. Having said that, the lamp post
is, in fact, rotting.
Again, thanks to all for your attention and for sharing your knowledge.
On 24 Apr 2006 06:34:05 -0700, email@example.com wrote:
Thx for the follow-up.
Have to admit, that sometimes getting overzealous with a knife to cut
uf's jacket has resulted in me damaging the individual conductor
insulations, so I understand why it took a while.
tom @ www.CarFleaMarket.com
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