What I do not like about usbs built in is that they chuck out crap onto the
mains as the circuits tend to be bought in crap from China. At least if you
get a plug in one, you can unplug it and see if its the guilty party.
Brian

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"David Wade" wrote in message
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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