tt system

[thekingiam]

do you mean mechanical protection for cable? if so can i use pvc conduit?

 

[thekingiam]

think it's about time to pay for bgb

 

[thekingiam]

maybe i could use 16mm if i need galv for protection as although i am great with galv i would need dies etc and would probably cost more in the end.

 

[Engineer54]

If the rod conductor is going to be embedded in concrete it's better to use PVC conduit...

But as Tel stated, it may be better to install a new rod position, one with a protective earth pit that can be maintained!! If you do decide to go this route, a couple of 5/8'' coupled rods should be used to give you a half decent chance of achieving decent Ra values, but most of all stability to your new rod!!! Nothing to stop you linking up with the existing Rod, just make sure you have at least the distance of the new rods depth between the existing and new rod positions....

 

[trev]

it's a short distance and will need 10mm for bonding so easier to just use 10mm

So the acceptable method of sizing an earthing conductor is now "Bung a bit of 10mm in"?
I'm sure your Elecsa man will have no issues at all with your method
Any non electrician reading this has just had his/her suspicions that "It's just a few wires, what can possibly go wrong." or "I don't need an electrician, why spend money on something any fool can do" pretty much confirmed

 

[bleach]

Hi all...quick question following on from this topic: If doing a c\u change or installing a new circuit where the earthing conductor (TT) is acceptable size but buried into concrete so cant access earth rod for maintenance. Do the regs say we are to install new rod or make existing one accessible before signing off. (what are our responsibilities for this)? I cant find anything specifically in bgb???

 

[diditrain]

132.16 bgb