Megger trouble - help

[Gerry24]

I have just blown the dust of my Megger MFT1553 and decided to run through some tests as I have a consumer unit to replace tomorrow. First one since passing my Elecsa registration .

Anyway, I have tried to do a Ze test and I can't get a reading. I am sure I am following the same procedure that I did previously.

Power off at suppliers isolator.
Leave main isolater swith on CU and all RCDs and MCBs swiched on.
Disconnect Main earthing conductor from earth bar.
Black lead to top hole in Megger labelled No Trip Loop
Green lead to middle hole in Megger which is labelled LO/L2
Red Lead to bottom hole in Megger which is labelled L1
Green croc clip on green lead and attach to main earthing conductor
Turn selector switch on Megger to No Trip LOOP
Red probe to line terminal in main isolator switch on CU.
Black probe to neutral terminal on main isolator switch on CU.
Press the yellow button on Megger.

Result is that the display keeps showing < 55 v and has the closed switch sign.

Am I making some stupid mistake (probably) or is my Megger kaput?

All advice gratefully received.

 

[mechelec]

This book is not cheap but it shows exactly where your probes need to go/links to insert and where etc highly recomended
Testing Electrical Installations: A Practical Guide for Electricians: Amazon.co.uk: Anthony Hinsley: Books

 

[Amp David]

This book is not cheap but it shows exactly where your probes need to go/links to insert and where etc highly recomended
Testing Electrical Installations: A Practical Guide for Electricians: Amazon.co.uk: Anthony Hinsley: Books

I got this book too and as you says for the actual amount of book you get its not cheap at all. The Christopher Kitcher's Guide book is miles better IMO and better value for money.

 

[m25maintenance]

hi, all if u av any megger problems, give megger in kent a bell, ask for help desk. they are very helpfull. iv used them a few times. numbers are on book in megger box