UK Multiple USB outlets in restaurant

[streamer]

Hi everyone
I'm busy rewiring a restaurant and the customer has asked for USB outlets at each table. I think it's a terrible idea - I'd be happy for my phone to go flat when eating out - but that's not the point! The type he has asked for are just USB outlets and not the ones combined with 13 amp sockets and there are 13 of them to be installed.
My question is what sort of loading could potentially be on them? They say the output is 2.1 amps and 5 volts so is it a simple case of that being 10.5 watts therefore 10.5/230=0.0456 amps?
Thanks

 

[telectrix]

10.5 watts is correct for 1 usb. when you have 13 that's 136.5 watts. no problem at 230V but if you step down to a 5V common supply, it's 27A @ 5V.

 

[littlespark]

Where you been, Streamer?

I’d separate them up a bit. Ie, not all on the one rcd. They always seem to cause problems.

 

[streamer]

Thanks @telectrix, that's what I thought. They are 230v input so the most that can be drawn on the circuit is 136.5 watts.
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Where you been, Streamer?

I’d separate them up a bit. Ie, not all on the one rcd. They always seem to cause problems.

I've been hiding! I've actually moved from sunny Coldstream to the big smoke of Glasgow, just finding my feet here and trying to get a few jobs in.

 

[littlespark]

Got any jobs needing finished over this side of the country?

 

[streamer]

Got any jobs needing finished over this side of the country?

Not really, I had a mad couple of months before I moved trying to tidy things up, and then the lock down made things even more complicated. But I've had a good few weeks working on the new house and garden and now just getting some work in over here. Are you keeping busy enough?

 

[littlespark]

Just started back last couple of weeks. Odd days here an
A lot of my ongoing jobs are still to go back to, customers are wary.
Couldnt get any SE income support, so had to claim UC.

 

[davesparks]

My question is what sort of loading could potentially be on them? They say the output is 2.1 amps and 5 volts so is it a simple case of that being 10.5 watts therefore 10.5/230=0.0456 amps?
Thanks

Yes, but you should allow a little for inefficiencies in the transformation/rectification etc.
But either way it adds up to a couple of hundred Watts total.

Depending on exactly how things are being installed I'd be inclined towards running a 6A circuit to feed them. Otherwise put them on a general socket circuit via FCU's

 

[streamer]

Thanks everyone for the replies. Helpful as always