Hi Bostjan,
In 5.2.2 there is the sentence: "However, for a SECONDARY CIRCUIT that
is neither connected to protective earth nor provided with a protective
screen in accordance with 2.6.1 e), Table 5C shall be used."
I understand that, that way it depends on output which table to select.
In Definitions I don't see SECONDARY CIRCUIT but I understand 12V as
being here SECONDARY CIRCUIT.
As it is (can be) not connected to earth and I don't know of protective
screen I'm not sure - may be 5C applies.
Beast Regards
Piotr
W dniu 2017-11-23 o 05:49, Boštjan Glavič pisze:
Hi Piotr,
I agree with Rich.
According to specification, output also complies with LPS (Limited Power
Source) therefore output must be SELV.
There is no PELV definition in IEC 60950-1.
About table 5B or 5C, which table you will use does not depend on output from your
power supply but on mains voltage (main network system). For normal application we
are using STAR system with 230V L to N voltage with OVC II --> you can use
table 5B.
Table 5C is used for OVC III applications.
I hope this helps.
Best regards,
Bostjan
-----Original Message-----
From: Richard Nute [mailto:ri...@ieee.org]
Sent: Thursday, November 23, 2017 2:28 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Safe powering 12V doorlock
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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