13 AM
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
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
There is no
e.pl]
Sent: Thursday, November 23, 2017 1:25 PM
To: Boštjan Glavič ; EMC-PSTC
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
connected to protective earth nor provided with a protective screen in
[mailto:piotr.ga...@micromade.pl]
Sent: Thursday, November 23, 2017 1:25 PM
To: Boštjan Glavič ; EMC-PSTC
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 connected to protective earth nor provided
[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 is
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 speci
t either
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 ha
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 Opinion
d 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
'n
: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, onl
uld 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, a
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 if
---
From: Piotr Galka [mailto:piotr.ga...@micromade.pl]
Sent: Wednesday, November 22, 2017 12:51 PM
To:EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Safe powering 12V doorlock
Dear safety experts,
Help me to make me sure that it is save to use the following power supply:
http://www.meanwell.com
Safe powering 12V doorlock
Dear safety experts,
Help me to make me sure that it is save to use the following power supply:
http://www.meanwell.com/webapp/product/search.aspx?prod=DRC-40
to power 12V doorlock with not earthed 12V supply.
I think that from practical point of view it is save but h
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 a
Subject: [PSES] Safe powering 12V doorlock
Dear safety experts,
Help me to make me sure that it is save to use the following power supply:
http://www.meanwell.com/webapp/product/search.aspx?prod=DRC-40
to power 12V doorlock with not earthed 12V supply.
I think that from practical point of view it
power supply class and
other basic ratings.
-Dave
-Original Message-
From: Piotr Galka [mailto:piotr.ga...@micromade.pl]
Sent: Wednesday, November 22, 2017 12:51 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Safe powering 12V doorlock
Dear safety experts,
Help me to make me sure that
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 situatio
Dear safety experts,
Help me to make me sure that it is save to use the following power supply:
http://www.meanwell.com/webapp/product/search.aspx?prod=DRC-40
to power 12V doorlock with not earthed 12V supply.
I think that from practical point of view it is save but how it looks
formally.
Thi
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