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Topic Title: How difficult to install TT system
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Created On: 24 February 2010 07:50 PM
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 25 February 2010 12:08 PM
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Paul1966

Posts: 1538
Joined: 21 December 2004

The sandy soil where I live (literally right behind the sand dunes onto the beach) means that in many places it's easy to sink a 4 ft. rod by just putting a small block of wood on top and using hand pressure - Not even any sort of mallet needed. Of course, the resistance isn't exactly at the low end of the scale......
 25 February 2010 12:38 PM
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mikejumper

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Originally posted by: Paul1966
Of course, the resistance isn't exactly at the low end of the scale......

Except when the tides in.
 25 February 2010 02:28 PM
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AJJewsbury

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Joined: 13 August 2003

A protective bonding conuctor unless pme is resticted to 6mm minimum and shall not be less than half earthing conductor so 10mm is the min where protective bonding is used


A TT earthing conductor could be as small as 2.5mm2 (provided mechanical protection/burial conditions are OK), so 6mm2 bonds may well satisfy all requirements.

- Andy.
 25 February 2010 02:29 PM
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Paul1966

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Originally posted by: mikejumper
Except when the tides in.




By the time it gets that far we'd better throw the main switch and evacuate!
 25 February 2010 07:29 PM
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daveparry1

Posts: 6089
Joined: 04 July 2007

I always use 10mm for the earth rod cable, I know it's not necessary but less likely to get damaged I reckon.
IET » Wiring and the regulations » How difficult to install TT system

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