Existing PME/TNS supply at service position. Run a minimum of 10mm 3 core SWA cable to your external location, following all approved cable installation procedures. Terminate in to a Metal Clad Dis-Brd. Link SWA Earthing Tag to DB-1's MET with 4mm, despite it being a Metal Clad Dis-Brd. (Belts & Braces!) Drop an Earth Rod in as close as possible to DB-1 and connect back to DB-1's MET with 10mm Bond any metal services entering the remote building with 10mm Bond any exposed metal framework of the building with 10mm Resultant installation has an excellent Ze DB-1 Resultant installation is tied down to 'True Earth' at it's remote location thus avoiding any 'potential' problems! Resultant installation avoids the need for expensive Time delayed RCD Split Boards! Comments and critisim gartefully received!
thanks for that sine! Will cut and paste to my ref material folder in the company file. Just a question is this still just called a tncs pme system or is it now a tt/tncs/tns hybrid. I would just put tncs pme on the certs
Are you saying that the source is a PME'd TN-S system Sine? i.e. a TN-S system that has failed and has been PME'd therefore TN-C-S?
I think Sinewave meant that the supply is either TN-S or PME and can for purposes of this cleverly thought out exercise be treated the same.. Maybe
Peng has interpreted my scribblings correctly. This setup can be used for either a PME or a TNS system. It is basically an extension of what virtually all DNO networks are anyway.
> Beware the ides Yes, most definitely.................. It may just be an excellent one and upset the stalwarts 'Apple Cart'!
> I wondered why you didn't use that method for an earlier post re supply to steel container ? Just goin with the flow that night!
Seniorsinewave ,I was tempted to reply , but as it's Sunday I resisted. Heaven knows what I might have said i had I weakened.
Its good & expensive for sure! Covers every angle but you would never get the Job unless you like working for £5 an hour! Ant
Exactly what LD was saying last night..you need good accurate definitive information..I for one have copied Sine's method and pasted it into Word..this is really what is needed..good solid information.nice one Sinewave..
I mentioned about TNS and PME on the IET Forum - the other day, the reason for which was an info request from my DNO/REC.
Sine..the SWA armour at service position..earth it or leave it unearthed?.... Would appreciate a reply so as I can head and close the document..thanks..