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Clearly teh two of you(Sidewinder and Steptoe) misunderstand "Diverted Neutral Current"

Ok, which standard are you refering to? So again what requirment is in place with regard to the resistance to earth of the electrodes along the CNE and at which points do the electrodes need to be placed? So if the last Point on the CNE had a Electode at 50 ohms and a break occurs upstream...

Hope ive answered your question's. Look forward to your reply :)

Well when you loose your neutral because of the pme link, some or all of the current may divert through what ever is connected to your met. If you copper water and gas pipe has a Resistance to earth of 1 ohm and the broken supply is much higher the majority of current diverts. Simple

One for you Steptoe, on your pme what resistance to earth do the electrodes along the cne need to be? Thanks

Correct they are from within, so your point is?

You think proper pme has no diverted currents?

I've answered, what's the relevance of external diverted neutral currents, I've explained to you how that one installation may have its own diverted currents within its bonding, you need to clearly explain the issue with the lack of further external diverted current.

Errrm clearly you are out of your depth, if the pen opens, then that one installation will have diverted currents within the installations bonding, the bonding may carry most of the diverted neutral current, so please explain your remarks.

Errrm clearly you are out of your depth, if the pen opens, then that one installation will have diverted currents within the installations bonding, the bonding may carry most of the diverted neutral current, so please explain your remarks.

Where does it state that external diverted neutral currents are a prerequisite of pme?

If the tx is earthed at the origin and then at any other point then it's tncs pme. The diverted neutral currents will come from the installation connected to the tx. Why TT? I m not saying TT it, just don't see the point of ridding a pme unless you are prepared to acquire the correct Ra. On the...

Be careful, yes it can be pme, why not? The point of an additional electrode is to limit touch voltage on a broken pen, if you not prepared to attain a value which safely limits the voltage, then why bother, just TT it.

No worries, cheers Paul

Thanks

I Seem to have no permission for most functions, any ideas?

The Gas Safe Register Brand is owned by the HSE, In my opinion the same should of happend within the Electrical Industry, obviously the problem being that only one company can run the register, in effect putting the others out of business pretty much. Its time the HSE step in and sort it out one...

Two thing to consider with TNC-S PME 1, Are there any Exposed/Extaneous conductive parts within any of the Zones? If so ther may be a perception of an electric shock, this depends upon the voltage dropped accros the Neutral. Cure = TT 2, Broken Pen,Potential between Exposed/Extraneous...

Its no wonder your confused, they arnt great questions HTH

Hi all, lookimg forward to using this forum. :)