TT system main bonding CSA?

[davesparks]

Ok tel I see but they could just put the link in at intake and have just a tnc- s system am I right

Yes a non-PME TNCS installation is possible but I don't think you'll see it supplied to a domestic installation

 

[Farmelectrics]

It's been a good read chaps I'm ttd out goodnight

 

[telectrix]

Ok tel I see but they could just put the link in at intake and have just a tnc- s system am I right

yep.like a rewire i'm just completing at present. overhead supply. PME sticker on cut-out, yet to get at the earth terminal have to cut seals and remove DNO fuse to release the cover. madness.

 

[davesparks]

yep.like a rewire i'm just completing at present. overhead supply. PME sticker on cut-out, yet to get at the earth terminal have to cut seals and remove DNO fuse to release the cover. madness.

Is it not one of those with the little plug in it which pulls out to get to the terminal? It's what they use around here.

I'll try and remember to get a picture of ours tomorrow

 

[Engineer54]

Thats not right mate. The IET state that in excess of 200 ohms can be unstable. As others have said you should be looking for as low as figure as possible.

I'd guess that 180 ohms now will exceed 200 ohms at other times of the year - and I ain't a betting man!

OP - I'd bend over and be ready to be well and truly spanked by Eng54 when he reads your post. At present he's getting his butt handed to him on a plate by the Yanks

You wish ....No-ones spanking my butt laddie, but i can give your butt a bloody good spanking if you like!!

 

[ipf]

You wish ....No-ones spanking my butt laddie, but i can give your butt a bloody good spanking if you like!!

I'm saying nowt :shocked3:....... atriot:

 

[Farmelectrics]

further to being asked yesterday were did i get the 200ohms maz value from for a tt system niceic earthing and bonding book 17th edition quote for a suitable designed installation forming part of a tt system, an earth electrode resistance not exceeding 200 ohms can,in many cases be considered to be satisfactory.

 

[trev]

Oh well, if the NIC have made up the regulation it must be right.
However, to the best of my knowledge the NIC regulations are not the ones which will be used against you in a court of law should things go horribly wrong.

 

[davesparks]

There's nothing like a bit of NICEIC nonsense to confuse a simple issue!

 

[Farmelectrics]

confussing i agree never the less plenty go along with the ncieic

 

[Engineer54]

confussing i agree never the less plenty go along with the ncieic

Yep, and normally it'll be those that know no better, and think that those 3/8'' short twiggs can actually be called an earth rod!!

Still amazes me just how little many here have, when it come to providing/creating a TT system!!

 

[Deleted member 9648]

Oh well, if the NIC have made up the regulation it must be right.
However, to the best of my knowledge the NIC regulations are not the ones which will be used against you in a court of law should things go horribly wrong.

I think you will find that the NIC's guidance is based on 7671...not made up regulations. Regardless of opinions a TT installation along those lines is not going to land you in court because it will comply with 7671 whether you approve or not.

 

[shanky887614]

I think you will find that the NIC's guidance is based on 7671...not made up regulations. Regardless of opinions a TT installation along those lines is not going to land you in court because it will comply with 7671 whether you approve or not.

that makes it worse.

its a reg based on aa guidebook!!!

 

[Knobhead]

I think you will find that the NIC's guidance is based on 7671...not made up regulations. Regardless of opinions a TT installation along those lines is not going to land you in court because it will comply with 7671 whether you approve or not.

I think you may find the IET don’t give a maximum figure. What the NIC base their figures on is misinterpretation of a suggested figure for the stability of earth electrodes.

Anyone that takes notice of the NIC needs their bumps feeling.

 

[Big_Gee6295]

problem with your solution Dave is that most terraced streets built pre war dont have the available space to space road 10' apart. the advice i have always worked to is anything over 200 ohms should be deeemed not safe and regs state 1667 ohms