I thought myself it was tn c s but had never had anything explained to me to be honest and have never came across that type of labeling myself untill now.
nvq level 3,17th edition and 2391.
its down to training everybody gets trained up differrent and if in doubt you give somebody a shout which is what i have done!
i,anybody or any employer as ever had a problem with my work rewire ing a house is on the smaller scale of jobs ive done, now me personly thinks its better for someone to look a little daft like i just have, instead of not saying nothing and thinking they no anything and get on with the job because we all know thats dangerous! Thanks.
Yeas, mate - I wasn't knocking you - just puzzled, because it's fairly fundamental stuff and there have been a few questions of this nature lately from allegedly qualified sparks, pretending knowledge they clearly didn't have.
And ALWAYS, the right thing to do is Ask, if you're unsure. Always. I won't ever knock a guy for being unsure and confirming something - I just needed to clarify for myself that I wasn't giving advice to someone to go kill themselves with, if you see what I mean.
TN-C-S is effectively the delivery method for PME, which is as you said, Protective Multiple Earthing. Strictly, this applies to the distributor's side of things, and not the customer side, and essentially, what it does is bond the neutral to earth at several points along the way from the sub to the supply head.
The labeling - should refer to the DNO side of the installation - but the notice may be there if it was TT previously, because there *may* be some changes required - particularly in the area of bonding, where the figures are likely to change quite a bit. It may uncover faults to earth which weren't apparent before.
From the customer point of view, PME doesn't necessarily mean changes, though, IMO - it is a good idea to carry out a full PIR when the method of supply is changed, to confirm the installation still meets the requirements of BS 7671.
