TT to PME Head Earth Terminal

[bozobro0]

Why is it that when the DNO provide an earth at the head they fit a cover over the terminals that you cant get off unless you remove the cutout and cut the seals.Why cant they provide an earth block at the side of the head if you not supposed to access their terminal.They have supplied alot of premises around here over the years with PME. Most are still on a TT system,and alot of them have damaged or non existent cable to the rods.:frown2:

 

[Knobhead]

Have a look at http://www.electriciansforums.net/e...al-forum/36671-dno-earthing-arrangements.html follow the link to pages 10 & 11.

 

[the pict]

Seals ?
there was a bit of wire with a little lead piece on the ground when I got there m'Lud
Pict

 

[mechelec]

I'm not chastising anyone but I will say that a neutral loop impedance reading of below 0.35 Ohms is not an indication that PME provisions are installed on the network, many TN-S systems will meet this value but won't have any multiple earthing installed!

It's a gamble that's not worth the risk to me, you're altering the means of earthing for a start which is notifiable under Document P so there now exists a record of your involvement, also backed up by any invoice issued.

Is it just me here or is everyone doing a quick neutral impedance test then forming their own PME?

I know what you are saying, you cant just go round making every installation PME but the neutral impedence test is a quick safety check to carry out on an installation that has a PME label fitted by the DNO to the cutout before you terminate your main earthing conductor.

 

[Engineer54]

I'm not chastising anyone but I will say that a neutral loop impedance reading of below 0.35 Ohms is not an indication that PME provisions are installed on the network, many TN-S systems will meet this value but won't have any multiple earthing installed!

It's a gamble that's not worth the risk to me, you're altering the means of earthing for a start which is notifiable under Document P so there now exists a record of your involvement, also backed up by any invoice issued.

Is it just me here or is everyone doing a quick neutral impedance test then forming their own PME?

They would be very foolish people if they did that!!!