underground joints

[fulla]

hi guys
i have to connect 50 outside lights the wiring will be swa cable and a flex off to each light my idea was to make off the swa in to an adaptable box, bring the flex for the light in to the box joint cores in connector block and fill with cold pour resin. this job has been done before but because the boxes were buried over time they filled with condensation and caused problems hence the reason i will use resin.
the only trouble i see is that i will have to gland off over 100 ends and drill the boxes for earthing banjos
has anyone got a better idea

 

[GLENNSPARK]

scotchcasts.....dont need to banjo em......come with a "hepbond"....that you crimp onto the armourings using an inner sleave that goes over the inner serving of the armoured...and a split outer that you close up with a large crimper over the armourings (the hepbond goes between these 2)....that keeps the armourings continuous..... you can use waterpump pliers to close the outer ring with a bit of brawn behind em......plastic shell....and your 2 part resin,....clip on lid to finish.......very reliable joints these....

 

[Lighthouse Phil]

I'm looking up a name of a two part mix, it gets poured into your joint box. 100% water tight but will allow you to push a screwdriver in at a later date..........I'll be back...

 

[Lighthouse Phil]

Glenn beat me to it.....cant remember the name tho

 

[needasparks]

Is it Wiska pack, or something like that.

 

[johnboy6083]

Most smaller joints don't even need that now Glenn. You have roll springs, and braiding that you use to keep the armoured continuous. A splice joint would be suitable for what the OP wants.

 

[johnboy6083]

Dielectric gel AKA potting compound will also be good for this. I use this for sealing flow meters that are often submerged for years.
I can't remember who makes it.

 

[Lofty]

You could use Pratley ( Pratley Junction Boxes for Ex Applications ) boxes. They're designed for underground use, in fact pulled some up the other day that have been underground for 15 yrs+ and dry as a bone inside.

Cheers,
Lofty.

 

[johnboy6083]

This is the stuff. DOW CORNING® 3-4150 DIELECTRIC GEL KIT

 

[Engineer54]

Cast resin joints are fine to use, so long as you will never need to get at the joint again. If you do, then a compound filled wiska box, or other IP 68 box, is your best alternative. One type of box is expensive but no need to drill hole the other is a cheaper alternative where you will need to drill hole. ..The choice is yours, ...things are not always easy, and the easy choices are rarely the best solution either...

 

[mackers]

resin joint, like everyone else but wheres the flex running to, is that in the ground?

 

[Knobhead]

If your coming out of the joint with flex forget any hard setting compound. As sure as night follows day you’ll have to get back in to them again. Have a serious rethink on your plans.

 

[Deleted member 26818]

There's no need to drill the box for the banjos.
Put the banjo on the inside, bend the tag op and bolt the earth conductor to the tag.

 

[johnboy6083]

Or use pyranha earthing nuts!

 

[LineProducts]

Mackers raised an important issue. Tell us more about what you are doing I.e. Are you intending one swa and one flex per box, or two swa plus flex and how will you protect the flex? Etc

Is coming out of the ground with SWA and then changing to flex an option?

Also what is more important - saving labour or saving on material costs?

It will then be easier to recommend a product.