Hi there
How do you guys get around the problem of there being no proper incoming earth from the municipality side? I waste so much time in trying to get someone out who understands the problem.
Over half the project we have worked on in the last 3 months have no proper incoming earth - one was 55 million rand commercial building with a fresh COC!!
The Main Border box with the main switch backed onto the Mini sub - fault current to earth around 100 amps on a 400 amp main switch. (I know you are supposed to do it by calculation but I always test with my Fluke after finding so many problems)
The one I'm looking at now - I can see its supposed to be TN-S, I can see a separate earth, but when I do a loop test at the mains position its just way to high (fault current around 30 amps on a 63 amp main switch).
Checked with 2 different meters.
I mean am I just unlucky of are there that many properties with bad earthing arrangements.
The local guys (who seem to have just given up) say bang a earth spike in. For me TT is a bit of a kak system. Don't trust it so much.
I figure if I can see a separate incoming earth I want a TN-S earthing system.
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