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Service Head Earthing Terminal TNC-S

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Paul505

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I want to upgrade the main protective bonding conductors on the gas/water from 6.0mm to 10mm.
Its a bit frustrating when the original bonding condutors along with the main earthing conductor are all conected into an earthing terminal, which is in the side of the main service head....which means you have to withdraw the cut out fuse and take off the cover to gain acsess to the earthing terminal.
Why would someone have done it that way originally? Because i would have thought to make life easier they should have fitted a seperate MET so you dont have to tamper with the service head, plus it makes sense for testing purposes aswell... Ze for example.
 
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Guitarist said:
They do a new earth terminal these days. It is a 16mm tail into the head with a soldered connector block to accept 1 x 16mm cable provided by the customer.
Click to expand...

Thanks for the reply Guitarist, but why the soldered connector block.....why not just a 16.0mm earth from the head into a standard MET which is screw terminated? Or have i misunderstood what you are saying...
 
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Paul505 said:
I want to upgrade the main protective bonding conductors on the gas/water from 6.0mm to 10mm.
Its a bit frustrating when the original bonding condutors along with the main earthing conductor are all conected into an earthing terminal, which is in the side of the main service head....which means you have to withdraw the cut out fuse and take off the cover to gain acsess to the earthing terminal.
Why would someone have done it that way originally? Because i would have thought to make life easier they should have fitted a seperate MET so you dont have to tamper with the service head, plus it makes sense for testing purposes aswell... Ze for example.
Click to expand...

its probably from the days when the MEB controlled the industry they could do things like that
 
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Paul505 said:
Thanks for the reply Guitarist, but why the soldered connector block.....why not just a 16.0mm earth from the head into a standard MET which is screw terminated? Or have i misunderstood what you are saying...
Click to expand...

Guy from Eon said it is what they are all using now. Just one connection for the customer to do what they want with.

[ElectriciansForums.net] Service Head Earthing Terminal TNC-S
 
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That looks to me as a quick fix on a converted TN-S service head!! The ''Standard'' DNO PME service head has an earth terminal, that is connected directly (usually by means of a sliding link) to the internal neutral terminal block and that earth terminal protrudes from the side of the service head...

This set-up looks as if it's saving them installing a standard PME head, for the cost of a short length of 16mm CPC with a numpty connector attached.... Typical i suppose these days, why do it right, when you can save a few quid and make a pig's ear of the job!! lol!!
 
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This is actually from the standard service head on a TNC-S system. The original earthing was 2 x 6mm straight out of the head, one to the CU and the other to the water bonding. I asked the guy to upgrade it to 16mm for me and this is what he installed. My 16mm goes from the top of this to the new CU.
 
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Guitarist said:
This is actually from the standard service head on a TNC-S system. The original earthing was 2 x 6mm straight out of the head, one to the CU and the other to the water bonding. I asked the guy to upgrade it to 16mm for me and this is what he installed. My 16mm goes from the top of this to the new CU.
Click to expand...

All i can say then, is it must have been and older PME head if it only had earthing facilities for 2 X 6mm cables, though i can't remember 6mm ever being acceptable for PME main earthing or bonding...
 
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I had no main earth at all when my house was converted to PME (I dont know when this was done) and when i called them to ask about it they said it would £85 + vat to connect an eath, and if they had to change the service head it would be £165.

Luckily for me I had noticed the seals had fallen off so I installed the 1m of 16mm myself.
 
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ample current said:
I had no main earth at all when my house was converted to PME (I dont know when this was done) and when i called them to ask about it they said it would £85 + vat to connect an eath, and if they had to change the service head it would be £165.

Luckily for me I had noticed the seals had fallen off so I installed the 1m of 16mm myself.
Click to expand...

well ive never known seals to just fall off lol :smilewinkgrin:
 
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