On Nov 14, 11:24 pm, geoff wrote:
In message
, Jim K
writes



On Nov 14, 8:17 pm, geoff wrote:
In message
, Jim K
writes

On Nov 14, 7:06 pm, geoff wrote:
In message , Mike Tomlinson
writes

En el art culo , geoff troll@uk-
diy.org escribi :

"I AM A VERY NAUGHTY BOY AND I SHALL NEVER MEASURE MAINS VOLTAGES WITH
RESPECT TO EARTH AGAIN"

Why not? (not arguing, just want to understand)

If nothing else, it confirms that earth is earth.

Example: troubleshooting a hypothetical faulty appliance, at the
appliance I measure 240v between L and N, and 0v between L and E.
Either the flex is 2-core or there is an earth problem somewhere.

Live is referenced to Neutral full stop

There is no requirement for earth to be at any fixed potential wrt
either, and as the OP discovered, you can get false, misleading results

er hang on, where were the false misleading results again?

Was it not you who got 240V on both sides of something?

As I said, I hadn't followed the thread earlier

--
geoff

er... a fuse in situ on the PCB?

indicates to me it's an intact fuse? no? (which it is when removed and
tested for continuity)

Which is the way you usually measure a fuse

do you mean check?

if it were blown, and still read 240v either side what would be the
point of it?

Depends if you were using a high impedance meter and measuring pick up /
coupling or whatever.

??

As the saying goes "If you think sex is a pain in the arse, you must be
doing it wrong"

Just measure Live wrt Neutral
measure a fuse by testing its resistance

I'd use a ruler.... ;)

Jim K