Underground joint kits

[omega]

Hi, just wondering if anyone can clarify the situation regarding underground resin joint kits.
I'm in the process of connecting an existing 3 core (R,Y,B) 16mm armoured cable which (unbelievably fed a garden shed?), to a new B,B,G 3 core 16mm armoured. Iv'e just bought the house and built a workshop so armoured needed lengthening. Two questions really, firstly iv'e had two different pieces of advice, one that i should energize the cable immediately after pouring the resin and the other saying nothing about energizing, just leave cables for 2 hours before
moving them, does it just depend on which kit i use? Second question is really just asking for confirmation regarding colours. Am i correct in thinking Red/Brown-Yellow/Grey- Blue/Black. Obviously they will be marked with correct colours at terminations. Cheers all, hope this wasn't too long winded, just thought it best to give a clear picture of the situation.

 

[markc123]

Cheers biff for going gentle with me this time. You normally like to eat me alive haha.

Point taken and understood though. I did know about it in the back of my head, but always chose to ignore it, stupidly. Things will be different from now on!

Everydays a school day!

 

[Guest55]

no probs.

but do it again and i will find you.

;-)

 

[heinzbean]

single phase. brown= line grey= neutral black = earth. Some of these joints still come with aluminium connectors. I throw these away aluminium and copper = electrolysis. I always use decent (tinned) un-insulated through crimps on(copper).(6mm/10mm/16mm/25mm/35mm joints. You can always leave the cap/lid off and poke the compound to see if its gone off. I have powered them with a wet freshly done joint and no problems , cold weather compound takes ages to go off and is thinner and leaks out easier. make sure you fit the earth strap properly. The joint kits never seem to have enough compound. The edf seem to use a different compound that sets instantly.

 

[Knobhead]

Before the harmonized colours were introduced it has been common practice on many many construction sites all over this country to use a four core SWA cable for 3 phase motors (even other supplies that require no N) with the black core used as an earth(sleeved green/yellow) so as to have an internal cpc in addition to using the SWA, maybe on larger SWA this would not always be the case due to cost, having said that I've seen it in the used (4 core) on I think it may of been 70mm parallel feeders, also in mining industry as to allow normal SWA on cables

I'd sack you for wasting money. 3 phase, 3 core.

Over the years I've dealt with 1000's of motors. Never seen 4 core used yet!

And don't get me started on M&Q!

 

[Deleted member 26818]

As I understand it, this is a single phase installation using 3 cores.
The original cable has most likely been wired Red = Line, Blue = Neutral and Yellow = Earth.
The original cores should hae been sleeved Blue with Black, and Yellow with G/Y, but it is unlikely that would have happened.
To my mind it doesn't matter how the new colours are connected to the old, just as long as the Brown is connected to the Red.

 

[johnboy6083]

For the colours: the convention is to use black as CPC, grey as neutral. On older systems it was red: live, blue: neutral and yellow as CPC.
there is no reg anywhere which insists this is the case. As long as the terminations are sleeved correctly, you can use what you like.
in the joint, you can energise straight away with no probs. use tape over the ends of the joint. Start on the cable, overlap onto the joint, and back down again. This will ensure no leaks. Ensure you continue the integrity of the SWA, using the roll springs and the braid.
pour the resin slowly, and give the joint a periodic tap or shake, to ensure there is no trapped air.
ive done hundreds of these joints, which were constantly immersed in chlorinated water, and never had a problem. Resin is the only 100% trusted waterproofing system in my opinion.

 

[KAS1]

British Sugar, British Industrial Sand to name just two lol

I'd sack you for wasting money. 3 phase, 3 core.

Over the years I've dealt with 1000's of motors. Never seen 4 core used yet!

And don't get me started on M&Q!

 

[Knobhead]

So for a medium sized motor you would run (say) a 185 4c when the armour of a 3c is perfectly acceptable as the CPC? Most motors will be fitted within a plant where there will be a myriad of parallel paths back to the MET to supplement the CPC.
If you have worked to M&Q you can tell me what the standard statutory earth continuity test requires?

 

[KAS1]

If you go back a few quotes you'll see it was posted on hear "Still find it slightly strange though how black can ever be earth" I was just pointing out that in many I mean many cases it has been (sleeved of course), I did not state that it would be my choice at all to run a four core for motors or any other supply when a three core will do. If you have never came accross this before, at least you will now be able to say hmmm I see what he meant. You should visit some run down plant/factory where most of the machinery is rusted to bits (have to watch my ps and qs if not I'm banned) armouring rusted to eel and you'd see why the internal cpc was a good idea lol live and learn, live and learn

Read more: http://www.electriciansforums.net/e...9-underground-joint-kits-2.html#ixzz2I3LJ8KdDr

So for a medium sized motor you would run (say) a 185 4c when the armour of a 3c is perfectly acceptable as the CPC? Most motors will be fitted within a plant where there will be a myriad of parallel paths back to the MET to supplement the CPC.
If you have worked to M&Q you can tell me what the standard statutory earth continuity test requires?