In message <ce1b19f4.1bc44%[email protected]>, dated Sun, 28 Jul 2013, Scott Xe <[email protected]> writes:

It is interesting issue.

The mains sockets are not required to apply safety classes but in terms of safety classes, it is class 2. Since it requires to have earth connection (I believe not "Must be earthed" and it is functional requirement for the mains sockets, not safety requirement with respective of extension sockets box), the class 2 USB socket within the same box cannot be marked double square symbol. Is there any supporting criteria for it?

No, because as I explained right at the start of this thread, the BSI committee responsible for BS 1363 hasn't yet written a standard for extension boards with additional IT facilities.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

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