On 06/04/2020 18:04, David Wade wrote:
On 06/04/2020 13:04, Brian Reay wrote:
On 06/04/2020 12:26, George Miles wrote:
But when an electrician gives the circuit an insulation test they
cannot isolate the USB socket so what do they do?

Or do they need an isolating switch?

Simpler and easier not to have any.


Interesting point.

However, after some worked (a new CU) our system was tested to comply
with Part P etc.

I don't recall the tester asking if we had any USB chargers plugged
in. He may have.


A similar test was done later, when we has the Main Fuse uprated.
Agian, I'm pretty sure I wasn't asked about USB chargers plugged in
that time.

The plug in ones use the same/similar circuitry and are generally on
24/7, along with things like TVs on standby etc.

Some of the older type need the insulation test to be run at 250v as per
this info from Megger

https://uk.megger.com/electrical-tes...ounted-sockets


but most modern ones are OK with 500v.

http://www.bgelectrical.uk/public/do...data-sheet.pdf


Dave


OK, thank you.

I can't recall if I had a installed a fixed one when the 2nd test was
done, think yes. Certainly there would have been several USB chargers
plugged in and on, if not loaded.