In message
<blupr02mb116efadd6d2fad04953cffcc1...@blupr02mb116.namprd02.prod.outlook
.com>, dated Mon, 26 Jan 2015, Brian Oconnell <oconne...@tamuracorp.com>
writes:
Was reviewing customer's construction where a 475V MOV was across the
(floated) 420Vdc bus. Said this was bad idea, and they referred me to
OSM/EE decision sheet 09/01 for EN60950-1:2006; which says ok to do
whatever you want with a VDR on primary side that is not connected to
mains. Can think of more than one SFC that would result in this
combination of circuit configuration and component ratings making a mess.
Any record of TC108 having affirmed this?
I think so. This MOV subject is very difficult. Putting a VDR on a
primary side that is not connected to mains is not inherently unsafe if
the VDR goes open-circuit. If it explodes, *provided the product remains
safe (even if badly damaged)*, the safety standard is not violated.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
When I turn my back on the sun, it's to look for a rainbow
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
-
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