one conduit in parallel set was damaged - replace one vs replace all?

[Fulthrotl]

Don't splices have to be accessible?

hypress, and 3m coldshrink in direct burial isn't accessible, but is done.

i'd megger all of the conductors, PH2PH and PH2GND, and repull the damaged one.

 

[Fulthrotl]

One of the sales pitches were that splices made with a compression tool had less resistance than the wire itself. The one time I measured and compared the voltage drop on a section wire, they were correct.

if one really wanted to get fussy about it, you could hypress and cold shrink,
and then use a TDR to look at the cables.

in my experience, a hypress done with correct dies, and a UL listed cold shrink
is as good as not being there at all.

 

[ptonsparky]

I find that hard to believe, unless the connector made of a material of less resistance than the conductor being spliced, but even then won't lessen overall resistance of the completed assembly if it is only a small section involved in the splicing method.

Splice 10 feet of gold into a length of copper, and you first have a very expensive splice, but may also noticeably reduce the resistance of the overall length.

I found it hard to believe myself but then I had all the necessary components of a scientific experiment right there. :roll: So I tried it.

I took the measurment on a piece of the bare acsr overhead we had spliced. I cleaned the conductor on both sides of the splice and on an equal distance of the original. I believe it was an Amprobe AM4 digital meter. The current was constant and I repeated the readings several times. Each was lower. Close enough

 

[Craigv]

I found it hard to believe myself but then I had all the necessary components of a scientific experiment right there. :roll: So I tried it.

I took the measurment on a piece of the bare acsr overhead we had spliced. I cleaned the conductor on both sides of the splice and on an equal distance of the original. I believe it was an Amprobe AM4 digital meter. The current was constant and I repeated the readings several times. Each was lower. Close enough

The spliced area may result in a short section of "larger" conductor, therefore lower resistance.

See the the same splice after ten years when corrosion has occurred at the mating surfaces. Might be different then.

 

[tom baker]

Since you will need to turn off the power, to do this work, when the power is off, pull out one wire from the other good sets, measure it, pull back in.
Assuming you can pull out one conductor! And get it back in...