Sub Main Earthing Question

[maffematics]

Hi all

I have been to a property that as had an extension done a few Years ago a 16mm twin and earth cable was installed to supply a consumer unit via a 63a switched fuse they used the cpc as the main earth for the sub board. The earthing arrangement is an TNS. As I will be installing new circuits to the consumer unit will I need to install a 16mm earth thanks for your help Matt

 

[Andy™]

depends if there is any bonding from there or not

 

[maffematics]

Thanks for the reply

Gas and water bonds go into house consumer unit

Matt