Earthed metal protection

[ianphilip007]

hi there

may need to bury some meter tails in wall (25mm 16mm earth), not my usual practice, now they will not be below 50mm so they will need earthed mechanical protection. can any one advise as whats best to use for mechanical protection and the size of the earth cable required for earthing it ?

many thanks

 

[alli]

I have some self drilling screws that will drill into RSJ's, and will go through 3/4mm steel in seconds. Thats another reason why it should be earthed.

That's some screw!! where do you get them from?

 

[oxocube]

Any decent ironmonger, the first 6mm or so is a drill bit. The larger sizes are used by sheet cladding/roofing firms.

Have a look Self Drilling Screws - Abrasives & Screw Products Limited

 

[the pict]

What I can't picture is what if, like any meter tails anywhere they are not goint to run in a straight line, So yes stick them in scaffold tube and earth it but it's going to be one hellava fabrication job getting the tube to bend even a little to get past the obstructions we meet every time you run 25mm cable, what about the pre armoured stuff, not swa, I cant remember who makes it, does that go up to 25mm??
Pict

 

[alli]

Any decent ironmonger, the first 6mm or so is a drill bit. The larger sizes are used by sheet cladding/roofing firms.

Have a look Self Drilling Screws - Abrasives & Screw Products Limited

Thanks, I have seen and used them of thin metal, I hadn't realised they can drill into RSJ's. I'll be giving them a go. Cheers

 

[wade88]

ive used these a lot for fixing hanging hooks to steel support girders, highly recommend!