I'm in the middle of fitting a new kitchen and need to replace the earth bonding running from my gas pipe to the water pipes under my sink (as the sink will be moving)
At the moment there's a 10mm earth running from the CU through the gas pipe onto the cold water supply. From the cold water supply there is a 4mm earth running to the hot supply and also to the sink.
I'm aware that all incoming services need to be earthed with minimum 10mm cable, i.e. 10mm to gas and cold water as is at the moment.
Is it strictly necessary to bond the hot water and sink separately, and if so is 4mm adequate or should this be thicker cable?
At the moment there's a 10mm earth running from the CU through the gas pipe onto the cold water supply. From the cold water supply there is a 4mm earth running to the hot supply and also to the sink.
I'm aware that all incoming services need to be earthed with minimum 10mm cable, i.e. 10mm to gas and cold water as is at the moment.
Is it strictly necessary to bond the hot water and sink separately, and if so is 4mm adequate or should this be thicker cable?