Hi Rich,
Thanks for confirming that isolation in doorlock can be only functional.
This eliminates me one conception that 12V can be ELV, but second
isolation is in doorlock.
So now, as I'm sure that 12V have to be SELV/PELV I have to ask them if
it is.
I know that for other supplies they specify that output is SELV but here
not, but they write that application can be access control so doorlocks....
There are TUV certificates at this supply page, but not report.
I don't know if I will be able to read with enough understanding the TUV
report. I have never seen one.
Best Regards
Piotr
W dniu 2017-11-23 o 02:28, Richard Nute pisze:
Hi Piotr:
The easy way to answer your questions is to request a copy of the TUV report.
1. I suppose that 12 doorlock manufacturer can use only functional isolation
betwean 12V and its metal casing as he can assume (I think) that he gets safe
voltage.
If I'm wrong with it let me know.
Yes, only functional insulation between the 12 volts and the metal casing.
2. Then as doorlock metal casing can be touched by user than 12V have to be
SELV circuit I think.
Yes. SELV or PELV; makes no difference.
3. I'm not sure if the 12V output from this supply is SELV - is it enough to
test the isolation with 3kV.
No, 3 kV alone is not sufficient. The isolation must also meet creepage and
clearance distances after being subject to a mechanical test of the isolation
means and the conductors.
Best regards,
Rich
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