Outdoor kitchen earthing

[Leyland30]

159 ohms

 

[Midwest]

Just to be annoying, why not extend the TNC-S, and install an earth rod as well? It's only what the 18th is gonna make us do.

Bonding; is the metal gas pipe reappearing from the ground at the outdoor kitchen? If not, its presumably already bonded in the house. Is the metal structure going to be extraneous? Why not run a 10mm swa anyhow? Why is the swa being rcd protected?

 

[telectrix]

with only 1 x 5/8" rod ................. 187 ohms

gerroff. i have achieved 30 ohms with a 3 ft. twig. once i had connected 6 of these the reading came down to 6 ohms.

 

[Wilko]

@Wilko will be along in a minute with the 'exact' prediction!

Hah ha ha ... I love the little tables of predicted values for Ra vs rod etc. Usually the soil resistivity is a complete guesstimate and so are the results

Perhaps a thing to look out for is simultaneous contact between the two earthing systems. Check that a person can't be in contact with a conductive part from the house (say the garden tap) and the new locally bonded stuff.

Edit : agree with @Midwest #17 ... why not extend the TNCS?

 

[davesparks]

Ok. The install is taking place on an existing patio. I estimate it is sat on 300mm of hardcore/rubble. Given the dry conditions we have had lately I think somewhere in the region of 60 ohms.

I will be using a 5/8" rod.

James

And how deep will you be going with the rod?

 

[Deleted member 9648]

I got 168 ohms a couple of weeks ago with two coupled 5/8 4ft rods. The first rod was well over 300 ohms. Unusual as a single rod normally gets under 100 in my area.