Domestic Ze ?

[Peter Woodford]

Guys,

just thinking, how sad on a sunday morning. If you had a consumer unit in a garage ran from the main board in the house would you do the Ze tests in the house ( i am thinking yes unless you had a earth spike near the garage is this right). Also if you did put in a earth spike at the garage i take it would also bring your zs readings down from the circuits that come off that board in the garage

can someone confirm thanks

 

[Guest123]

Ze is always measured at the origin of the installation.

What you would measure at the garage DB would be the Zs and PFC of the sub-main supplying it.

As for an extra spike in the garage this would depend on wether you had a TT, TN-S or TN-C-S earthing system to start with. If not a TT then probably no bearing at all as the resistance would probably be too high to make a difference to the readings compared to the TN-S, TN-C-S and bonding conductors etc.