Since it works with a phone, 62368-1 applies. I would not rely on
60950-1 because of the incidence of fires and electric shock. Bedrooms
and nurseries are especially sensitive locations. Also, note that a jack
plug is shorted when inserting or withdrawing. That is why the
concentric connectors are used instead on portables and everything
else. What happens if you plug the 5 V DC into a headphone socket, too?
Not a good connector to use.
If the client insists on what appears to be a very marginally safe
course of action, I think you have to consider your professional position.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2019-10-24 11:34, Matthew Wilson | GBE wrote:
A client has a product, to be used by consumers typically in a bedroom
or child's nursery, which has a microcontroller and is Wi-Fi enabled
so it can present data to 'the cloud' and interact with a mobile phone
'app' to change some parameters on the device. We have been asked by
the client with help in sourcing a power supply for it from Far East
sources. They want a 'wall wart' type plug in device with a 2 metre
lead to a jack plug. The product requires 5V DC up to 1A and has a
jack socket DC input. Cost is, of course, a key driving factor but
there are some very keen priced items available out of the FE.
Ignoring 62368-1 for now, as there is still just over a year to go
before this becomes mandatory and it appears the majority of 'cost
effective' PSU manufacturers are not up-to-speed with this standard
yet. They probably will wait till the last minute, or relying on the
'get-out' 4.1.1 clause in 62368-1.
The question is what standard should the PSU meet? 60950-1 or 60335-1?
60950-1 is for IT equipment, 60335-1 is Household and similar
electrical appliances. Both standards might apply. If it was a laptop
power supply 60950-1 would even though the laptops are sold and used
in the home.
One potential PSU manufacturer, however, does claim both 60950-1 and
60335-1 for the same product. Is that possible with one design?
I know this might also spark a debate about risks of FE manufacturers,
conformity of production and so on like the excellent blog post here
https://www.unit3compliance.co.uk/tag/power-supply/ We have a presence
on the ground in the FE to verify any manufacturers and all the three
potential suppliers identified so far have listings on TUV or Intertek
and have also provided conformity documentation supported by
legitimate third parties.
Any thoughts welcome.
Thanks for reading.
Regards,
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