new CU

[aptsys]

I too see nothing wrong with a TT supply, possibly even prefer it to TN-C-S.

 

[ban-all-sheds]

So you prefer a fault loop which is too high to allow an MCB to operate.

This correspondence is now closed - it is not possible to use reason to argue against opinions not arrived at by that method in the first place.

 

[aptsys]

I've had three occasions in two residences where the CNE has been lost.

TNS FTW!

 

[MrsBanal]

So you prefer a fault loop which is too high to allow an MCB to operate.

Yes. Leave that to the RCD, and the MCB for Phase-Neutral shorts. What's the problem?

 

[LoveRocket]

The problem is that he says TNC-S is the world's best earthing arrangement, and therefore anyone who thinks otherwise is:
a) Wrong
b) An idiot
c) Dangerous
d) Incompetent

It's actually not a bad delusion to have - if you know that you're always right about absolutely everything (even subjective issues), the by definition anyone who disagrees is wrong. Simples.

 

[MrsBanal]

Good analysis

 

[securespark]

So you prefer a fault loop which is too high to allow an MCB to operate.

Yes. Leave that to the RCD, and the MCB for Phase-Neutral shorts. What's the problem?

Well, if you have a TT supply, you are limited in choice. You should not use a metalclad board. You must RCD-protect all circuits.

I also happen to agree with Ban on the following:

If you have the opportunity to install PME, I believe it is better, not only because of the above reasons, but also to have a low EFLI than a high one and then have to rely on an RCD to disconnect within the required time.

After all, RCD's are renowned for failing, as electro-mechanical devices surely do.

 

[ban-all-sheds]

Strange isn't it, that LoveRocket and MrsBanal have not accused you of being deluded.

I wonder why that is?

One might almost think that their criticisms of my post were motivated not by disagreement with what I wrote but rather by a childish and irrational desire to have a pop because of who wrote it.

But surely nobody could be that stupid and pathetic, could they?

 

[MrsBanal]

Calm down darling

 

[ban-all-sheds]

So tell me - was your criticism motivated entirely by what I wrote?

 

[GaryMo]

Are you two sharing the same PC whilst communicating to each other via the internet? Right - it's MY turn now

 

[ban-all-sheds]

Nothing to do with me - just trying to find out if MrsBanal has got genuine grounds for criticising what I wrote, or if he is just a pathetic, inadequate and below-average-intelligence little twerp.

 

[MrsBanal]

Actually I would put TN-C-S as lowest on my list, and would have said that whether it was you or someone else that said it. Now if we implemented TN-C-S like in some other countries where a stake is inserted at every property to form part of the multiple earthing then I would rate it higher.

 

[ban-all-sheds]

Actually I would put TN-C-S as lowest on my list, and would have said that whether it was you or someone else that said it..

Go on then:

If you have the opportunity to install PME, I believe it is better, not only because of the above reasons, but also to have a low EFLI than a high one and then have to rely on an RCD to disconnect within the required time.

And when you've done that perhaps you'd like to explain why you didn't put forward a reasoned engineering-based argument preferring TT over TN-C-S instead of just agreeing with a personal attack from LoveRocket.

 

[1john]

PME is prefered for the following reasons

lower EFLI
reliable earth connection
MCB can operate if RCD fails on a line to earth fault

one downside is that should the neutral break then the installation can be at potential but you make get false 'dead' readings due to lack of return path on either neutral or earth.