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SteveF1

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Dear All
A mate of mine recently asked me to look at his installation. It has been wired to the 17th edition and all looks kosher, but when I carried out some testing I discovered that it had High impedance values. I disconnected the Main earth that had been connected to an earth clamp, attached to the armouring of the Supply Authority cable (old type armoured covered in hessian and bitumen). Took a reading from this clamp, this gave me a reading of 4.29 ohms taken with a Fluke 1653. The type of supply is TNS.
My questions are these:
1. Is it the responsibility of the Customer or the Supply authority to provide an Earth?
2. Is there a charge for the customer if they request a TNC-S supply (PME) instead of a TNS, seeing there is no Earth provided.

Kind Regards

Steve F
:rolleyes:
 
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i had a broken tn-s supply giving a high eli, reported it as dangerous and the elec board came out and did a repair at no cost,a cable tv contractor had damadged the sheath in the road.
 
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SteveF1

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  • #3
Thanks for your reply. The supply authority attended the property in question to-day. They said that the cable sheath was not and has never been connected to earth and that an electrode will have to be installed. I find this extremely hard to believe as this would mean that the property which was built in the 50's has never had an earth and has always been a TT system. I think I will have a look at his neighbours house.

Is there a certain distance the Earth Electrode has to be away from the property?
 
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Spudnik

  • Thread Starter Thread Starter
  • #4
Normally somewhere sensible just outside the location of the CU.

Sounds to me like the property was earthed through the incoming gas and/or water service pipes.

Not ideal!!!
 
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SteveF1

  • Thread Starter Thread Starter
  • #5
Yes your probably right!
When you say just outside the location of the CU, do you mean outside the property as the CU is under the stairs.

Regards

Steve F
 
yes it needs to be outside the house just find the most convenient route out and run that way, it doesnt need to be the shortest way, i would put the stake in an earth pit of some sort to protect the connection.
 
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SteveF1

  • Thread Starter Thread Starter
  • #7
Thanks Mark
That is exactly what I thought.
Cheers Mate!
 
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