upgrade or not

[Farmelectrics]

question a mate of mine who has a few houses, has just had an eicr carried out due to change of occupancy and the electrician has said the earth to gas and water wants up grading to 10mm . problem is the whole house as laminated flooring which posses a big problem for him he tells me . the earthing to water and gas looks to me 4mm but when i carried out an r2 test the reading i got was 0.04 end to end .so in theory does he really need to lift the flooring.

 

[telectrix]

is it TNC-S? if so 10mm would be required on a new install and an upgrade recommended on existing install. however, if the existing bonding cables are in good condition with no signs of thermal damage, and your readings are as you stated, then it's a C3 and can be left as is.

 

[Farmelectrics]

its a tns tel

 

[Farmelectrics]

ive not seen the test sheet so dont no what code as been applied my mate was just asking my advise will ask to see test sheet when i see him

 

[davesparks]

No he doesn't have to lift the flooring, surface wiring is allowed.
6mm is the minimum size for a main bond, the resistance is irrelevant.

 

[amlu]

Let the electrician code it on EICR, give him the paper he asked for. Up to the customer if he want remedial works or not...

 

[Leesparkykent]

Let the electrician code it on EICR, give him the paper he asked for. Up to the customer if he want remedial works or not...

What's wrong with the customer asking for another opinion?

 

[Farmelectrics]

seen the test cert last night its a code 3

 

[Farmelectrics]

i wouldnt say the resistance was irrelevent dave

 

[davesparks]

i wouldnt say the resistance was irrelevent dave

Why not? The minimum size is 6mm in the regulations with no mention of any allowance for smaller if the resistance is a certain value, therefore the resistance of a main bond smaller than 6mm is irrelevant.

 

[DPG]

Why not? The minimum size is 6mm in the regulations with no mention of any allowance for smaller if the resistance is a certain value, therefore the resistance of a main bond smaller than 6mm is irrelevant.

Unless you have a particularly long run and go over the 0.05 Ohms. Daz

 

[davesparks]

Unless you have a particularly long run and go over the 0.05 Ohms. Daz

Which 0.05ohms would that be then?

 

[DPG]

The 0.05 Ohm recommended maximum. It was a tongue in cheek comment - don't take it too seriously! I'll put a smiley on next time Daz

 

[davesparks]

The 0.05 Ohm recommended maximum. It was a tongue in cheek comment - don't take it too seriously! I'll put a smiley on next time Daz

Recommended maximum for what? GN3 has that as a recommended max across a bonding connection, I don't think it has ever been applied to the bonding conductor itself.

 

[DPG]

Must admit I thought this was also a rule of thumb for the bonding cable itself. Apologies. Daz