On 07/04/2020 17:09, newshound 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.

[george]

On Monday, April 6, 2020 at 11:26:53 AM UTC+1, simon mitchelmore wrote:
Does anyone know if the USB charger is permanently energised (when
fitted as part of 13A sockets) or whether it's turned on via a micro
switch when the USB plug is inserted (I'm guessing the former)?

I know the current draw of a USB charger is tiny when open circuit
but, being 'old school', I always remove the USB lead plug when not
charging our phones but this may be the cause of several USB leads
becoming faulty. Maybe I should leave the USB leads connected
permanently and relax?

I'd guess they are designed to tolerate 500 volts or so from a megger?

Some can. But there can be other issues. E.g. Big live found one gave
low resistance (c. 0.3 MO) on L-N test

https://www.youtube.com/watch?v=NW9ljFMxenE

--
Robin
reply-to address is (intended to be) valid