Wago capsules & gland earthing

[SimonH2]

With the recent thread related to Wago stuff, I had a browse around their site - and there's some interesting things there.
Was looking at their capsules which look like a handy junction box for some applications. Then I watched the video on that page, and starting at 4m10s in it talks about earthing of SWA glands. I'm "not sure I trust" that earthing method - it certainly goes against what I was taught many years ago

 

[ban-all-sheds]

Surely "many years ago" banjos with a flying earth lead would have been what you were taught?

I guess you could use that plate and earth nuts.

 

[333rocky333]

What are your concerns, I noticed
1 clamping up metal against the plastic, though thats similar to a banjo really
2 Using a spade connecter, though many appliances do similar

 

[SimonH2]

I was taught that you can never rely on a connection with plastic sandwiched in it - plastic creeps over time (especially if it gets hot), clamping pressure is relaxed, joint is no longer reliable. So to use a banjo, you'd have to use two nuts so the banjo is either between one nut and the gland body (outside the box) or between two nuts (inside the box).
The only concern I'd have with the spade terminal is that I've seen how some people bodge them onto a wire

 

[333rocky333]

Maybe the density, if thats the right word of the enclosure is as good as clamping on say steel.
Wiska boxes use a similar method i think.

I do agree what you saying though and that is the reason Earthing Nuts are fitted with an allen key to Lock on to the thread.
As Ban says an earthing Nut would be ideal, but I cannot see Wago promoting a rivals product made by SWA amongst others.

EDIT
Looks like the wiska ones have a locking screw

 

[ban-all-sheds]

So do Piranhas.

 

[SimonH2]

I asked the manufacturer, and amazingly got an email back - didn't expect that late on a Saturday evening
The boxes are made of polycarbonate (one question I asked as it's not on their site), but the guy missed the point and pointed out that there are many boxes that are drilled to accept glands rather than addressing the issue of earthing integrity.