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mspms

Good evening all. I wonder if anyone could give me a steer as to why I am getting very high Zs readings. I have been testin a circuit that has a R1+R2 of 0.23 ohms but I seem to be getting Zs reading on L-E of + 40ohms. L-N is coming in at 0.2ohms. The incoming fuse is a 63amp BS1361 an RCD main switch protecting all circuits. All other tests are fine. I am wondering whether it could be my meter not reading correctly on the Zs test. Any ideas?

Thanks all.
 
What's your Ze mate? When was your meter last calibrated? It could be a few things what earthing system is it?
 
try taking as reading on the L busbar. if that is high, then it's due to internal resistance of RCD and/or MCB. flick them on and off a couple of times. if that reading is OK, try at the terminals of the socket, not the front. try flicking the socket switch/es on/off.
 
try taking as reading on the L busbar. if that is high, then it's due to internal resistance of RCD and/or MCB. flick them on and off a couple of times. if that reading is OK, try at the terminals of the socket, not the front. try flicking the socket switch/es on/off.
Never considered that but will remember it for future reference!!
 
Thanks for your suggestion I will give it a go. Just to add more pain, I thought I would try a reading from a socket in my own home and again I'm getting +40ohms. Just coincedence?
 
mft leads. ????
 
What are you using to test the socket? Have you tried testing at the terminals on the back?
 
Sorry teletrix. It was a long day. I gave up and came home. The house is empty at the moment so no chance of any mishaps!
 
My Ze was really low at 0.09ohms. My meter has just been calibrated and it is a TN-C-S.

- - - Updated - - -

I'm using my 3pin plug and leads.
 
Batteries going down? Bad contacts on the three pin plug? Dodgy terminations, any load on the circuit? (mainly an inductive might cause a false reading) What make of RCD is it?
 

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