Tns earth problem

[flukey]

hi all,
been to look at a job where the tns supply has a 4mm stranded cable sweated to sheath and going to met.
been on the phone to edf trying to get this upgraded but unable to speak to anyone
what is the way forward with this problem as i dont want to tt the supply, just get the earth upgraded

 

[Mac]

Jason was going on about some spring loaded clamps.Haven't used them myself,i would be a bit worried over tightening them.It would probably be best to let the DNO deal with it.Sorry i can't be of more help.

 

[flukey]

hi mac
cheers for the reply.
if i could get hold of dno i would but they keep saying high call volume blah blah blah call back later

 

[Mac]

hi mac
cheers for the reply.
if i could get hold of dno i would but they keep saying high call volume blah blah blah call back later

Have you tried the safety and emergency numbers.
Safety & Emergencies

 

[flukey]

yes mate, they dont want to know, passed me onto general enquiries who are too busy

 

[Mac]

yes mate, they dont want to know, passed me onto general enquiries who are too busy

I did find this on the forum.Someone quoted about taking the 4mm to an MET and 16mm to the CU.
http://www.electriciansforums.net/e...l-regulations/9045-main-earth-connection.html Hope it helps.

 

[flukey]

already read that one mac, looks like i will have to put it back in the hands of the customer to resolve with their supplier before i attend

 

[mechelec]

hi all,
been to look at a job where the tns supply has a 4mm stranded cable sweated to sheath and going to met.
been on the phone to edf trying to get this upgraded but unable to speak to anyone
what is the way forward with this problem as i dont want to tt the supply, just get the earth upgraded

You have two choices
1 - take 16mm from MET and connect onto 4mm. This is a common method and I know that the 4mm does not comply, your choice.
2 - Apply for PME this will cost you but be a proper solution to the problem.

Note: do not use standard pipe earth clamps on paper lead cable as you will risk crushing the lead into the cores dont forget that the service cable will be protected by up to 630A fuses at the sub and the DNO LV network works on a 100 second disconnection time, just enough to burn your house down

 

[flukey]

thanks for the replies
managed to get hold of supplier and they have got seimens coming on friday to upgrade so all should be well depending on who attends

 

[flukey]

supplier turned up today to upgrade the earth and guess what, they installed a standard 951 clamp to the lead sheath

 

[Amp David]

Cowboys!!! lol

 

[Mac]

supplier turned up today to upgrade the earth and guess what, they installed a standard 951 clamp to the lead sheath

I'd report them mate

 

[Spudnik]

Trouble is chaps, they can pretty much do what they like with their cables.

 

[Guest123]

Who you going to report them to??? it's their kit.

 

[flukey]

too true lenny, trouble is we are told one thing and they do another