I've been testing a static caravan installation. At the plastic meter box outside the 'van (which contains an RCD, 16A MCB, meter and 16A socket for the caravan) I get a Ze of 20 ohms and 13.5A PFC. The earth is through the incoming looped SWA of 2 x 2c 16sq.mm cables (crude TNS from the point of view of this caravan but probably TT for the site). The RCD trip times are all fine so all is well.
If I put the earth lead onto the galvanised angle iron which supports the plastic box instead, I get a Ze of 1.16 ohms, 199A PFC!
I'd be more comfortable if the caravan had its own earth rod but I'm not responsible for the system, I'm only here to test the caravan and that is all fine. I'm tempted to bond the angle iron anyway.
If it was up to me every caravan on the site would have its own earth rod.
What does anyone else reckon?
If I put the earth lead onto the galvanised angle iron which supports the plastic box instead, I get a Ze of 1.16 ohms, 199A PFC!
I'd be more comfortable if the caravan had its own earth rod but I'm not responsible for the system, I'm only here to test the caravan and that is all fine. I'm tempted to bond the angle iron anyway.
If it was up to me every caravan on the site would have its own earth rod.
What does anyone else reckon?