Nick & PSNet,
It appears that you are dealing with two issues bundled together...
One is: how do you meet the requirements of the standard in a reasonable
way? and two: how do you demonstrate compliance with the requirements of
the standard when questioned?
For the first we might rephrase it: how do you prove that the 300VA
unit is adequate to hipot your machine... my understandidng of the purpose
of the 500VA specification is to insure that the test equipment will have
the capacity to test any machine in a full and complete way. The key
parameter is the input capacitance of your machine which soaks up the hipot
output and keeps the voltage from rising to the full test potential for the
complete test cycle. This is straight EE work... figure it out... if you
can't figure it out go to an experimental approach and hipot test your
machine with two hipotters - a 300VA and a 500VA unit... then you'll
know... I have seen equipment that swamped out hipot machines which were
not sufficiently robust and were indicating failure (why do you think the
expensive consultant was called in to fix the problem?)...
For the second we might rephrase it: who will want to know how you
are meeting the requirements of the standard and how will you prove it to
them??? since you're certifying compliance yourself any questions will
come from national authorities; then the answer above is your defense...
so, it seems to me, that you can answer your own question about
purchasing the 300VA unit yourself after some investigation...
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Peter E Perkins
Principal Product Safety Consultant
Tigard, ORe 97281-3427
+1/503/452-1201 phone/fax
p.perk...@ieee.org email
visit our website:
http://ourworld.compuserve.com/homepages/peperkins
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