On Jun 3, 9:05*am, charles wrote:
In article , H. Neary

wrote:

[Snip]

A visual inspection finds virtually everything.

That depends on how thorough you are. *Do you open the plug top and check
the terminals?

A DMM will find the earth faults and insulation problems, the supply
breaker you plug into isn't too bad for leakage caused by none linear
conductors.
A PAT tester would possibly find a few problems that the DMM wouldn't,
but given a protected supply with an RCCD there is no risk.

A DMM does not provide 500v. You need that to check insulation.

I don;t think you can on all equipment, it's OK on leads but putting
500V into a lot of electronic
and scientific equipment isn't a good idea, particually computers or
so I was told.


That's
what used to come from an old fashioned "Megger". It's now part of a PAT
tester.

--
From KT24

Using a RISC OS computer running v5.18