I have had a new supply but I cannot see the earth cable from the intake to CU Do I have to fit this my self I have tried to include pics but I am unsure as to how this is done,bit of a tecno head scratcher Iam affaid
new supply no earth
- Thread starter maguire
- Start date
Are you the Electrician or the customer ?
View media item 17951
View media item 17952
View media item 17950
Those pictures?
Anyway, it looks like it could be PME - how was the system earthed before the new supply was installed? It seems odd that the DNO would not reconnect the main earth where PME has been provided, unless the cable was never present in the first place.
If the supplier does not provide your earth connection, it will be your responsibility to provide one in the form of a TT supply with earth electrode. This isn't really DIY work, as you would need to confirm that all circuits are correctly RCD protected, and also perform impedance testing on the electrode itself.
View media item 17952
View media item 17950
Those pictures?
Anyway, it looks like it could be PME - how was the system earthed before the new supply was installed? It seems odd that the DNO would not reconnect the main earth where PME has been provided, unless the cable was never present in the first place.
If the supplier does not provide your earth connection, it will be your responsibility to provide one in the form of a TT supply with earth electrode. This isn't really DIY work, as you would need to confirm that all circuits are correctly RCD protected, and also perform impedance testing on the electrode itself.
Iam providing a complete rewire and converting a shop to an office and all the outlets are being raised to work top height to allow for a clutter free floor area behind desks etc the supplier has provide a upgraded intake and all is ok apart from providing a main earth it is of a type Iam unfamiliar with although I have not as yet removed the incoming cover due to time constraints but a quick look showed no obvious provision for the earth connducter at source View media item 17950 View media item 17951 View media item 17952
Previously the earth was a piece of ,or rather several stands of the wire armour twisted together, taped up and connected into the neutral terminal before the meter with no connection from the CU back to the earth hence my call to the supplier who agreed that the existing arrangement was all together un safe
cheers
cheers
What do you mean by "new supply"?
Who connected it to the CU?
How did they carry out the necessary tests and fill in the schedules of results if there was no earth?
How did they ensure that the design of the installation was suitable for the type of supply you have?
What type of supply is it - does it say anywhere?
Information to be provided on request
28. A distributor shall provide, in respect of any existing or proposed consumer’s
installation which is connected or is to be connected to his network, to any person who can
show a reasonable cause for requiring the information, a written statement of—
.
.
.
(d) the type of earthing system applicable to the connection
.
.
No, it should be done by your electrician, but unless it's a TT supply the supplier should provide an earth terminal:
Equipment on a consumer’s premises
24.
.
.
.
(4) Unless he can reasonably conclude that it is inappropriate for reasons of safety, a
distributor shall, when providing a new connection at low voltage, make available his supply
neutral conductor or, if appropriate, the protective conductor of his network for connection to
the protective conductor of the consumer’s installation.
http://www.imageshack.us/
That's what comes of taking too long to create a reply....
How did you design that without knowing the supply type?
A new CU was fitted by someone else not me I hasten to add and it all looks a bit sloppy I do not imagine any tests were done as the customer has no certificates. odd as this was an insurance company request before change of ownership of the premises, before any work is carried out all the required test and inspection procedures will be carried out as there are spurs of spurs and god knows how many cross connections there will be
DM
DM
Have you performed a Ze test at the incoming terminals of the CU ??
He cannot do that if there is no earth.
You'll need to get confirmation of the supply type. if it is TNC-S (PME) then those exposed terminals next to the nutral tail is where your main earth conductor would go.
What size conductor would you use there, by the way?
Yes you are wrong
Its a three phase head.
There will be three 100A fuses one for each phase and one neutral connection. That is the one that you can see - it will connect (inside the head) to the combo neutral/earth block. You can see the screws to terminate the earth in that clover-leaf thing in the picture.
MacGuire
Just wanted to check
Just wanted to check
Hi again
Just to clear things up this was a job I looked at and advised the customer to get onto the supply company to sort out the mess that was there before the new three phase service head was put in. I had to get onto them as they were reluctant to come out when the customer phoned anyway they customer phoned to say they had been and I went for a quick look and was surprised that no earth was present I thought that at the very least they would have reconnected the existing earth from the CU back into the supply head, And that was the jist of my original question who was responsible for providing the earth I know that when a meter change takes place any earth disturbed is reinstated but as I have now found out not when there is only a change in supply apparatus. even if that means the installation and supply have NO earth connection I am still in debvate with the powers that be over this but given the time of year and the risk I have now provided a sollution IE provide a earth connection with a 16mm CPC from the service head provision
Thanks to all who contributed
Mac
Just to clear things up this was a job I looked at and advised the customer to get onto the supply company to sort out the mess that was there before the new three phase service head was put in. I had to get onto them as they were reluctant to come out when the customer phoned anyway they customer phoned to say they had been and I went for a quick look and was surprised that no earth was present I thought that at the very least they would have reconnected the existing earth from the CU back into the supply head, And that was the jist of my original question who was responsible for providing the earth I know that when a meter change takes place any earth disturbed is reinstated but as I have now found out not when there is only a change in supply apparatus. even if that means the installation and supply have NO earth connection I am still in debvate with the powers that be over this but given the time of year and the risk I have now provided a sollution IE provide a earth connection with a 16mm CPC from the service head provision
Thanks to all who contributed
Mac
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
