Earth readings

[Bradley6969]

TT system Ze is 17.5 ohms but when connected it is 0.60 ohms? Have one outgoing 95mm SWA and one 240mm SWA earthed either end and individual rods?
Thanks

 

[telectrix]

parallel paths via bonding and/or the other rods.

 

[radiohead]

What is the means of earth fault protection to the SWA's?

 

[Bradley6969]

What is the means of earth fault protection to the SWA's?

Has a main adjustable RCD
[automerge]1579416233[/automerge]
It’s an overhead 3 phase supply, looking at the electric board cut out there’s no earth there eg TNS or PME, but at the other end of the tails connected to a DB there’s an earth there, tested that at 17.5 ohms and connected in parallel with all other DBs and it’s 0.60 ohms, then my highest sub circuit is about 1.57 ohms

 

[Mike Johnson]

Just a thought, is the earth into the DB of sufficient section?