Cable Joint

[Knobhead]

Use mechanical connectors in a cast resin joint. You don’t say what the operating voltage is.

 

[Gomaa Mousa]

Use mechanical connectors in a cast resin joint. You don’t say what the operating voltage is.

medium voltage cable, 18kv

 

[davesparks]

why the reduction in the csa of the cable

It's not, it's an increase in CSA if you read the thread again.

 

[Knobhead]

Thought as much. Where are you based?

300mm[SUP]2[/SUP] triplex is getting to be the standard for MV repair work. You could look at Reychem cold shrink kits designed for a trifurcating joint.

 

[Geordie Spark]

to allow electrons to flow from one to the other. :49:

It's the same as the chicken crossing the road innit!!! :sailor:

 

[Knobhead]

I notice he’s cleared off now he’s got his answer.

You’d think I’d learn to keep my gob shut after all the years I’ve spent on international forums.

I should have left him with Des’s post 14

 

[tazz]

Could always use Wago`s Tony....house bashers swear by them....lol

 

[Knobhead]

A fair amount of our 11KV network used 19/.044 (22mm[SUP]2[/SUP]). The only cable we stocked was 95mm[SUP]2[/SUP]. There’s an art to soldering them together.

Parts of the original 1930’s system looked like a string of beads with joints and different sized cables. So long as the protection is set for the lowest rated cable it’s fine.

 

[Marvo]

You get reducing ferrules, sometimes called offset ferrules but I've only ever seen them change by one conductor size so you'd probably need to go first to 185 to 240mm then up to 300mm in two steps rather than one big step.

 

[Knobhead]

If you know what you’re doing you can go from any size to another. On MV stress gradients have to be accounted for.

 

[Engineer54]

medium voltage cable, 18kv

I suppose you didn't think sort of mentioning, that you were talking about a MV cable didn't enter your mind!! Amazing!!

 

[Knobhead]

As soon as he mentioned 300/185 it gave the game away.

A trifurcating joint before new switchgear is common practise in the UK now as the new stuff is designed for 300mm[SUP]2[/SUP] triplex terminations. Say a new transformer and tee switch is to be installed on an existing 185mm[SUP]2[/SUP] 3c ring, two joints have to be installed to enable termination. One joint would have to be installed anyway as obviously the one of the two cut ends of the cable would be too short.

 

[Engineer54]

As i say, seen these ''Triplex'' cables around, but never used them on my projects it's all been 3 core SWA cables direct buried or ducted or AWA singles in ducts...

 

[Knobhead]

Your not working to a standard specification unlike UKPN who are. I’ve got to admit, I had to read through the spec twice to be sure I’d read it properly.

I’ve never had dealings with trifurcated joints as they wouldn’t meet the company spec.