TT system main bonding CSA?

[Engineer54]

Sorry mate, but bum bandits just ain't my bag

You don't need to be a bum bandit to have it thrashed!!

 

[D Skelton]

I was basically referring to the crap stated in BS7671 and NICEIC propaganda and the OP's statement of misinterpreting BS7671. I was also trying to get him to Think past/further than painting by numbers so to speak.... I didn't want to go through the same old tooing and throwing seen in similar previous posts...

I think by now everyone here knows my views on UK TT systems and what's needed to make them as safe as you can realistically achieve...

Dammit!

No bite

 

[Deleted member 9648]

Replying to this comment only, not taking into account anything else that has been said in this thread; with that logic, being happy with a two figure Ra value is just as much a basic nonsense, as is relying on a high single figure Ra value. Exactly the same thing is going to happen when that 30mA RCD fails... Sod all. This is why we fit an s-type up front, or, we rod an installation in order to obtain TN values and rely on them.

What a complete load of utter common sense!

 

[D Skelton]

What a complete load of utter common sense!

I do my best ;-)

 

[Engineer54]

What a complete load of utter common sense!

Say's the man that can't be arsed to even TRY to construct a half decent TT system!! But there you go!!

 

[GB.Kayak]

Rewiring an older TT terraced property. There is currently 6mm earthing from the rod, and also as main bonding to gas and water. I (was!) confident that 6mm main bonding met the requirements of BS7671, but a fellow Part P installer insists that I need to upgrade the main bonding to 10mm, but that 6mm for the earth rod is satisfactory.

So, please could someone tell me the minimum CSA for the main bonding, and, if it is meant to be 10mm, how come the earth rod only needs 6mm? A reference or page number to the big book would also be helpful.

Many thanks

Falcon Flyer

Here is one that members of this forum prepared earlier to coin a well known phrase from a famous childrens' TV programme ... http://www.electriciansforums.co.uk...cal-regulations/70322-adiabatic-equation.html

 

[Knobhead]

Is the >200Ω being regarded as unstable in the new version of the IET joke book?
I suppose it would be too much to hope they would have taken the trouble to add a clarification of the value and point out it is not the acceptable minimum value.

 

[Deleted member 9648]

Dammit!

No bite

Say's the man that can't be arsed to even TRY to construct a half decent TT system!! But there you go!!

There's always a bite if you wait long enough,just need the right bait!

 

[Deleted member 9648]

Is the >200Ω being regarded as unstable in the new version of the IET joke book?
I suppose it would be too much to hope they would have taken the trouble to add a clarification of the value and point out it is not the acceptable minimum value.

Not got a copy yet.....but would seem unlikely anything will change.

 

[Anthony S]

Is the >200Ω being regarded as unstable in the new version of the IET joke book?

Yes it is

 

[Engineer54]

Is the >200Ω being regarded as unstable in the new version of the IET joke book?
I suppose it would be too much to hope they would have taken the trouble to add a clarification of the value and point out it is not the acceptable minimum value.

One section of BS7671 that is in dire need of a complete overhaul, but instead have been led up the garden path by the LFB, that will eventually need changing yet again in the not too distant future. It's another 15th ed earth bonding boo boo scenario all over again from what i can see of it...

 

[Dan]

Just bumping some threads in the Electrical Wiring Theories and Regulations forum category here on our Electricians Forums. If this specific topic isn't current, just ignore it, it'll drop off the list in no time. However, if it's something you'd like to contribute to, feel free to reply and bring it back into current discussion.