Minimum bonding size TNC-S

[robd]

Afternoon all,

Just trying to clear something up, going through regs book at present.

Basically have got a TNC-S/PME installation, 16mm tails, 60/80a main fuse (think it is 60A), 6mm bonding to water and 6mm coming from service head to block then into CU as main earth.

Am I right that being as it is PME I am obliged to upgrade bonding to 10mm as per table 54.8 and that the note about bonding must be not less than half size of CSA for main earth only applies to conditions other than PME.

Just wanted to be clear as that's how I'm reading it, the job is a mains change. Thanks in advance.

 

[Toneyz]

If you wait a couple of weeks and its got plastic incomer won't need bonding big tin hat on-off the cuff remark.

 

[Deleted member 26818]

If you wait a couple of weeks and its got plastic incomer won't need bonding big tin hat on-off the cuff remark.

No need to wait, there has never been a requirement to bond plastic incomers.

 

[robd]

Sadly it's copper not alkathene

 

[Midwest]

If you wait a couple of weeks and its got plastic incomer won't need bonding big tin hat on-off the cuff remark.

As I understand the draft, I might be wrong, the metallic pipe entering the building need not be bonded;

'Chapter 41 Protection against electric shock
Section 411 contains a number of significant changes. Some of the main ones are mentioned below.
· Metallic pipes entering the building having an insulating section at their point of entry need not be connected to the protective equipotential bonding (Regulation 411.3.1.2).' (Hager)

Whereas before, it was a slam dunken?