Dear Rich,
Thank you. So in reality no way to avoid abnormal testing, since on transformer
we always measure >42,4Vpk.
Best regards,
Bostjan
From: Richard Nute [mailto:ri...@ieee.org]
Sent: Thursday, January 15, 2015 1:52 AM
To: Boštjan Glavič; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [PSES]
Grounded SELV is PELV in EN 60204-1.
-Dave
-Original Message-
From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: Wednesday, January 14, 2015 1:59 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] safety distances in DC/DC
In message
, dated Wed, 14 Jan 2015, Brian Oconnell
wri
Dear Boštjan:
a) If internal distances input to output
comply with functional insulation only, fault
condition tests need to be performed on functional
insulation (including transformer) in order to be
sure that output remains SELV. In addition,
transformer needs to pass electri
In message , dated Wed, 14
Jan 2015, =?iso-8859-2?Q?Bo=B9tjan_Glavi=E8?=
writes:
I was talking about component level converter that is usually mounted
to PCB. No plug provided. Output is SELV.
I was asking how to evaluate internal distances input to output. I
believe there is no real harmo
In message
.com>, dated Wed, 14 Jan 2015, Brian Oconnell
writes:
Other than BS7671/IEC60364, what standards or codes use 'FELV' and what
is intended end-use?
I've never done a search. The issue with floating SELV is that it could
become live but remain undetected until someone touches it.
Dear all,
Thank you for your feedbacks.
I was talking about component level converter that is usually mounted to PCB.
No plug provided. Output is SELV.
I was asking how to evaluate internal distances input to output. I believe
there is no real harmonization between testing laboratories on this
Other than BS7671/IEC60364, what standards or codes use 'FELV' and what is
intended end-use?
Have never seen in NFPA70, but remember something in IEC60364 that restricts
plug configurations.
Brian
-Original Message-
From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: Wednesday, J
In message
.com>, dated Wed, 14 Jan 2015, Brian Oconnell
writes:
if the input and/or output referenced to reliable ground bond.
Note that only(?) 60950-1 allows SELV to be grounded. Other standards
require it to float, and call the grounded kind FELV (Functional...).
--
OOO - Own Opinions
a. Depends on measured WV of the converter. Fault tests non sequitur for
functional insulation as basis for protection from shock or prevention of fire.
Fault tests are indicated only to demonstrate SELV during fault. By definition,
FI does not provide any level of protection. Di-electric withst
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