To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Safe powering 12V doorlock
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
EN 60204-1 for machinery defines PELV for itself and does not even use SELV.
-Dave
-Original Message-
From: John Woodgate [mailto:j...@woodjohn.uk]
Sent: Thursday, November 23, 2017 2:00 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Safe powering 12V doorlock
e.pl]
Sent: Thursday, November 23, 2017 1:25 PM
To: Boštjan Glavič <bostjan.gla...@siq.si>; EMC-PSTC
<emc-pstc@listserv.ieee.org>
Subject: Re: [PSES] Safe powering 12V doorlock
Hi Bostjan,
In 5.2.2 there is the sentence: "However, for a SECONDARY CIRCUIT that is neither
conne
[mailto:piotr.ga...@micromade.pl]
Sent: Thursday, November 23, 2017 1:25 PM
To: Boštjan Glavič <bostjan.gla...@siq.si>; EMC-PSTC
<emc-pstc@listserv.ieee.org>
Subject: Re: [PSES] Safe powering 12V doorlock
Hi Bostjan,
In 5.2.2 there is the sentence: "However, for a
eee.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
betwea
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
SELV or PELV could or could not be connected to earth.
Rich
-Original Message-
From: John Woodgate [mailto:j...@woodjohn.uk]
Sent: Wednesday, November 22, 2017 2:52 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Safe powering 12V doorlock
The definition of PELV that I have is, I t
There is no definition of PELV because the definition of 'SELV circuit'
does not prohibit a connection to earth, as other definitions of SELV
do. Also see Note 2:
NOTE 2 This definition of an SELV CIRCUIT differs from the term "SELV
system" as used in IEC 61140.
John Woodgate OOO-Own
: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 isolat
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,
not be connected to earth.
Rich
-Original Message-
From: John Woodgate [mailto:j...@woodjohn.uk]
Sent: Wednesday, November 22, 2017 2:52 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Safe powering 12V doorlock
The definition of PELV that I have is, I think, from IEC 60364, and it says
The definition of PELV that I have is, I think, from IEC 60364, and it
says 'not electrically separated from earth', which I interpret as
meaning 'connected to earth but not necessarily with a connection that
can withstand a large fault current'.
You must do as you see fit, but I think that
John,
Reading EN 50491-3 (HBES and BACS safety) it looks that for devices like
our controller 60950-1 is right choice. I have newer found the better
fitting standrd.
Meanwell also selected 60950-1 for their supply.
So the only unknown are the standard for doorlock and wires :).
If the
Dave,
I was thinking if first ask Meanwell or here, and decided to ask here
believing I will learn more.
Till now from Meanwell reseller in Poland I know that for some supplies
they specify that output is SELV, but for this one there is no such
information.
I plan to ask them following
John,
If the output is SELV earthed (in other standards PELV) then (as I read
60950-1) table 5B applies and test 3kV is ok. If you decide to use 5C
table then because of earthing you can use one level lower test voltage
(as I read Annex G) and you end also with 3kV test.
But there is no info
But does 60950-1 apply when the application is a door lock? In any
case, I am not suggesting that any particular power supply is
unreliable, but you never know what happens in installations and 'power
cross' is not an unknown hazard.
John Woodgate OOO-Own Opinions Only
J M Woodgate and
In order for a power supply to meet SELV requirements it must pass all of the
tests in the EN60950-1 standard for SELV which means component failure testing
among other things, not simply isolation testing. Meanwell power supplies that
I have researched have been SELV. Meanwell has been very
We need to be very careful here. There is not a single definition of
'SELV'. Some definitions allow the LV circuit to be earthed, some do
not, and refer to 'Protected Extra-Low Voltage (PELV)' for SELV which is
earthed. Non-earthed SELV is OK for some purposes, but I don't like it
for
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