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An "interesting" one today... lighting circuit, everything turned off, (on all circuits and disconnected) but 85 Ohms L to N resistance, (thats 600 Watts), tested again with power on and verified by LED "blicks" on meter... thats the entire lighting circuit "on" - but NOT What can the "load"...

This is a strange one, but may have a simple answer.. upstairs light radial is from a RCD, 18ms at I downstairs light radial is via a rcbo, 28ms at I upstairs hall landing is switched by two switches, (live) connected to down radial, neutral from ? if a load (bulb) is turned on (or a megger...

I am not Part P etc qualified, but are using the upgrade of my CCU as a "case" I have all the necessary equipment Megger 1552 etc. There will be departures, due to the age of the house (1963), all of the upstairs lighting has no cpc and some of the downstairs has no cpc. The rest is fine. It's...

What's the difference between Zt, Zs and (R1+R2), I thought that Zs was the loop impedance, Zt ? and either R1 or R2 can be measured directly or derived from the difference between Zs and Ze, or am I totally confused?!

On an Installation Schedule form (including test results) does the no. of points refer to actual sockets (ie a double socket = 2) etc or a point as in the term a connection which may mean a double socket =1