Cable Jointing Question

Rob_the_rich · Oct 16, 2015

Am I right in thinking that the jointing method used here

https://dl.dropboxusercontent.com/u/24033707/IMG_20151016_154221.jpg

Does not connect the sheath across the joint?

This is on the end of the cable

https://dl.dropboxusercontent.com/u/24033707/IMG_20151016_154734.jpg

and it is TNS.

kerching · Oct 16, 2015

I Would have thought it depended on whether the new bit was a 3 core, 2 core or lead sheath. And whether they had swaeted to the old sheath or not.

I would not have thought that just by looking at a bit of heatshrinkmyouncouod accurately tell,what was inside it

I have seen similar on Lead sheath and the earth has been continued across the joint

Just sayin

Evans Electric · Oct 16, 2015

I'd say that was a lead tube enlosing the joint , plumbed onto the lead sheath at each end , Almost certainly a 2 core with the sheath as earth.

Just waffling .

Tony S · Oct 17, 2015

[SIZE=medium]At a rough guess, 4c PILC with jute serving. The plumbed lead sleeve ensures continuity across the joint.[/SIZE]

[SIZE=medium]Nice job whoever did that, it will outlast all of us.[/SIZE]

Rob_the_rich · Oct 17, 2015

Thanks for the replies. That puts my mind at ease a bit.

It did look like a plastic sheath on it, so probably heatshrink.

I couldn't do a Ze due to not being able to disconnect supplies to the flats. Was only fault finding a lighting circuit anyway.

They recently had hot water coming into the property from the water main, and when it rained, the pavement outside remained dry and steamed a bit. So the pavement was dug up and cable fixed.

misssweden · Oct 17, 2015

Plumbing lead, one skill that I don't have to learn.

kerching · Oct 17, 2015

misssweden said:
Plumbing lead, one skill that I don't have to learn.

Is that because you can already do it?

Or is it a H&S thing and it is not taught anymore?

misssweden · Oct 17, 2015

Not taught anymore, just use an earth kit instead.

Evans Electric · Oct 17, 2015

No tallow & moleskins for you then Miss Sweedy ? :innocent

misssweden · Oct 17, 2015

Nope, I'm the wrong generation.

kerching · Oct 17, 2015

Evans Electric said:
No tallow & moleskins for you then Miss Sweedy ? :innocent

What she wears when going out at night is none of your concern!

Still,got my moleskin somewhere....probably as dry as a Meerkats pocket by now!

Tony S · Oct 19, 2015

[SIZE=medium]I was a convener for the E.E.T.P.U.[/SIZE]

[SIZE=medium]Electrical, Electronic, Telecommunications and Plumbing Union[/SIZE]

[SIZE=medium]Early on many cables were paper insulated lead sheathed PILC so the two trades went hand in hand.[/SIZE]

[SIZE=medium]It’s a skill still used today. PILC cables are virtually indestructible, they will stand overloads that would melt a XLPE. Their one failing is absorbing moisture so sealing them is where the skill comes in. I opened a MCC incomer panel and the pitch in the end boxes was liquid. We added a third parallel feed at the next shutdown, I tested the two existing feeds, >1GΩ after 25 years of abuse.[/SIZE]

[SIZE=medium]Here’s one I made earlier[/SIZE]

[SIZE=medium]11KV 95mm² 3c PILC-SWA[/SIZE]

[SIZE=medium]

[/SIZE]

misssweden · Oct 19, 2015

Nice one Tony

Is it just me, or is burning the pitch out of old endboxes weirdly satisfying?

Lurch · Oct 19, 2015

Funnily enough I was reading a thread on another forum yesterday where someone had terminated some armouring of the SWA into a streetlight cutout in a similar manner to cries of OMG RAF etc.

Tony S · Oct 19, 2015

misssweden said:
Nice one Tony

Is it just me, or is burning the pitch out of old endboxes weirdly satisfying?

[SIZE=medium]Not when it’s in the back of your mind, “I’ve got to make this off again and I’m going to get filthy”. You can never clean every last bit out.[/SIZE]

[SIZE=medium]We had a transformer 3.3KV box with the bushings weeping oil. Usual trick, ignore it and keep toping the conservator up. Eventually something had to be done. It was getting to be a bit of an environmental disaster area.[/SIZE]

[SIZE=medium]A subsidiary of the DNO did the repair, new bushing and tank gaskets so the top and conservator had to come off. With the top off we found the tap changer had been burning up. That was a quick fix, take it out, short it out. (How often are they ever changed?)[/SIZE]

[SIZE=medium]When it came to refilling the box they used a cold pour gel. I’ll look for the name of it for you, it’s a bit safer than standing on top of the tank with buckets of Trinidite. I’ve used it since but can’t remember the name.[/SIZE]

Lurch said:
Funnily enough I was reading a thread on another forum yesterday where someone had terminated some armouring of the SWA into a streetlight cutout in a similar manner to cries of OMG RAF etc.

[SIZE=medium]Do you know anything about MV cable jointing?[/SIZE]

Lurch · Oct 19, 2015

Tony S said:
Do you know anything about MV cable jointing?

I wasn't criticising the method in the picture above.

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