500V insulation test of a British General USB socket.

For those questioning why I tested resistance between Live and Neutral, a full test on a new installation should be done between L-N, L-E and N-E to detect if cables have been damaged during works. The only time N+L are bonded together and tested to earth is if there is an un-isolatable load. This is why I thought it a bit odd that it would mention protection against an insulation test and give a typical resistance. There's no ground reference on the USB module, so you would expect any test to ground to be off the scale. I wondered if the standby current was so low and component ratings so high that it would give a pass if only a few were on a circuit.
The test is definitely not a mains to USB output one as there is not any standard installation test that would even do that.
Maybe I'm out of date and they simply don't bother doing a L-N insulation test in this era of "Part P" 1-day/week electrical training and crash-certification for cash (The worst thing to happen in the entire history of the British electrical industry, and entirely motivated by profit.) But to me the L-N insulation test is important, since the others will trip an RCD/GFI at 30mA whereas a L-N circuit fault will require literally thousands of times higher current to activate protection.
This video was unexpectedly inspired by an email from Ruben mentioning a Thomas Nagy video where he was talking about doing electrical installation tests involving socket outlets (receptacles) with USB sockets. I had one of the same sockets awaiting our amusement so I dug it out and zapped it for our entertainment.
Here's a link to the Thomas Nagy video. He's a self employed electrician in London who makes good video content showing the daily working life of a London electrician.
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