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No sure why you would want the RN value unless of course you are looking at a ring circuit.  But to calculate the Zs you'll need the R1+R2 value per M then the length of run  Use the correction value and add that to Zdb or Ze as required to give calculated Zs To find the length or run from a...

Should have the results back after 5 to 6 weeks if C and G. Good luck.

A I understand it... A 2-probe unit: The Line probe goes to the 'Line' conductor.  The return N for the unit goes internally to the other probe and thus runs the switching mechanism of the unit via the E path (if any) The switch is made and the currents now passes from phase to the N/E probe...

We live and learn.  So why use different colour leads then?  This is the way that my Robin works (as far as I can tell)

Think about that for a while Andy GuinnessA 2-lead unit won't work with incorrect polarity...as it uses the N lead to run the machines innards and needs the right bits in the right place.  The 3-lead unit uses the 3 leads only id on sort test with RCDs to saturate the core... but on hard test...

All current using equipment removed (lamps, chokes tec.) All circuit breakers open All switches closed - not forgetting any 2-way or intermediate switching All test gear working Fault on circuit (not clear where the fault is though at this point are we) As above - regarding about everything...

I think you're right there Slips. As far as I know all EFLI meters are like that... incorrect polarity and no-go.   

The over all recommendation would be... 'Satisfactory' as the installation passes all tests.  However, due to the age of the wiring and the non-compliance of the installation with respect to the current edition of BS7671 as amended (No RCD's)  it is strongly recommended that an EICR be carried...

If wiring is sound, then 'age' does not enter the equation.  I'll not bore anyone by repeating what I have written above.  You cannot, and should not, (in my view)  issue a danger notice based on the age of the wiring.  If there are signs of the wiring disintegrating and failing tests,  then of...

Incidentally, if a lead covered cable is in reasonable condition and passes all relevant tests then the only 'problem' is age.  And as far as I can tell, age is one thing and a faulty cable that fails the test procedures is another. The best thing to do in this situation would be to indicate...

Dear Steptoe, What is meant by 'OK ish' for IR test?  Did they comply or not?  More to the point, what would you have done if there was a N/E fault or the insulation was found to have fallen from the conductors of the lead covered circuits? Why would you not put them on an RCD if they were...

Sorted.  Private message gone :-)

It is a genuine offer Arunciblespoon.  As long as it helps you on your way. I'm on the Skype thing as well as it may be easier to talk face to face on some points.  Not sure how to send you details as yet but will take a look some time today.  I've not tried to teach anyone anything on-line so...

Get yourself an copy of GN3, email me and I'll help you to get trained in inspection and testing.  I'll even send you questions and  guide you to the answers for free.  But please take care!

A four pack of Tramadol. Hammer.  Nail gun and a first-aid kit.  Phone numbers of good electricians.  Test kit.

I put the VS in the same corner as the Martindale plug-in tester, 'ok' but not a 'Real' test unit.  They both have their uses but both have limitations.  It's down to understanding the kit and working accordingly.  No more, no less.  I have a decent 'Contact' indicator, non-contact VS...

Dear Arunciblespoon Please sir and with with respect , you have big gaps in your knowledge and understanding of the problem you have highlighted, but you are correct by saying one should NOT to rely on the 'Volt Stick'.  It is just another tool to give a primary check and a dam site safer than...

Well say what you mean then dear chap.  To Prep the end would mean to 'get it ready for'  what ever you intend to do with it.  i.e. are you going to terminated it or contain it.  Please, forget talking like a school boy and use correct electrical terminology.  Better than that, take a course on...

So how does one 'prep' an end then?  As far as I recall to prep and end in order to test it or terminate it, the conductors would have to be exposed?  Or did you mean you were going to wash the dirt/dust of it?  This is either a wind-up or you're a one-off.  Try and not kill someone, but if you...

Stripping an end of a cable to see if it's live?  Priceless.  Both of you need to be trained... preferably last week!