I was working in a Commercial building yesterday, hooking up some new mains.
In the bottom of the switchboard I saw this enclosure marked "Telecommunications Earth- Do Not Disconnect!"
And there was a 6mm2 wire leaving the box and running (I presume) out to an electrode outside.
I've never seen one of these boxes before, at least if I have, I've never taken any notice.
Why does the telcom's system need to be earthed?.
I thought it was a DC system, that was isolated from earth.
Could Paul or someone else please enlighten me?.
It just struck me as strange, it being the first time I've seen one!.