I've been asked to add a USB charging port into a bedroom with a bath in it.
My understanding of BS7671 is that a room with a bath is a bathroom. As such the outlet would be in zone 2 of the bath.
Would I need to power the charger via a safety transformer and could this be built into a +IP4 enclosure similar to a shaver outlet
Thanks for your assistance
the remaining parts need only each need to comply with some suitable standard for each individual part. W
I disagree ... sub-assemblies aren't certified to suitable product standards.
Legislation also gets in the way for that type of 'assembly', including the EMC Regulations 2016.
This definitely falls into what is being covered by Regulation 113.1.
Perhaps a hard wired cable that cant reach the bath?
Not sure if a waterproof usb fly lead exists though?
You need to be really prepared to carry a male to female long lead.
I am working on a reduced output voltage USB supplied by a isolated psu that has its output limited either 230vac or 12-24vdc selv. So even a fault condition the psu will fall over rather supply more volts or amps.
Bath bombs and damaged skin submerged in a bath is my fear.
My intention is selv or isolated psu outside this area.
As previously discussed USBs can be selv but this isnt enough for safety purposes whilst charging in a bath.
Perhaps a hard wired cable that cant reach the bath?
Interesting thought! Rather like a tethered lead on an EVCP.
Now that USB-C is the common standard (link), a plug on a lead could be quite useful. Being a plug, its use would not be prohibited. How daft!
I'm missing some logic here I think.
Say I take a BS 1363 socket, put it in a BS 4662 back box, add a rubber grommet to BS EN 61340-5-1 and perhaps a choc block or two to BS EN 60998 and hold it into the wall using some screws to whatever standard they're to - is there a standard for that overall "assembly"? (other than BS 7671 itself)
So what's the difference if I take a BS EN 61558-2-6 transformer, and a AC-DC module to whatever standard they're to and connect them together on site?
- Andy.
using some screws to whatever standard they're to
Wood screws used to be to BS 1210:1963.
BS1363 tests use that back box in some tests.
BS61558-2-6 specifies IP rating, and more for the location.
BS61558-2-6 allows other sockets but not linked to the shaver output transformer.
I have a similar problem with a switch ive designed that uses an approved 300vac terminal but it fails compliance when used to 60669.
Sometimes I give up wondering why and just need to interpret the rules.
My USB question is an example of can I? Should I? And that before I get to how do I?
BS61558-2-6 specifies IP rating, and more for the location.
BS61558-2-6 allows other sockets but not linked to the shaver output transformer.
I think some confusion here. We were discussing BS 61558-2-5 shaver sockets (my emphasis). Andy used a BS 61558-2-6 transformer as a component.
BS 61558-2-5: 19.105 Shaver supply units shall be provided with socket-outlets in the output circuit. (emphasis in the original)
My intention is selv or isolated psu outside this area.
As previously discussed USBs can be selv but this isnt enough for safety purposes whilst charging in a bath.
One of the problems, as i see it, is that BS 7671's idea of SELV (especially the extra precautions for within zones in bathrooms) isn't quite the same as other standard's idea of SELV -basically BS 7671 doesn't accept the electronic PSU approach for supplying things within zones and wants a traditional isolating transformer (or the equivalent - say a motor/generator or independent battery) - hence my thought to "front end" the system with a BS EN 61558-2-6 transformer.
- Andy.
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