According to EN 61010, which may not be exactly as UL 61010, a hipot test =

(dielectric strength) at 840VAC corresponds to 0.5mm clearance through basi=
c =

insulation. BUT the correspondeing DC value should then be 1200VDC accordin=
g to =

table 9 and not 1080VDC so the values may come elswere from.

The clearance depends on a lot of factors - type of insulation, pullotion =

degree, category of measuring circuit, transient voltages, rated operating =

altitude, working voltage, combination of voltages for different circuits, =

mains voltage where the circuit is used and possibly more.

So a hipot test may not be irrelevant.

You should be able to get the paragraphs in 61010 where these requirements =
and =

values are stated (it should be in the test report).

/Ruben

> Mike Hord wrote:
> =

> >>So, did ETL make a mistake in specifying a hipot test?  Or am I missing
> >>something in the UL-61010 requirements?
> >>
> >>You should DEFINITELY ask them both whether the test is truly
> >>needed AND what the point of the test is.  If the person you ask
> >>doesn't know, push the matter- someone has to, or you're just being
> >>asked to destroy one of your (expensive?) devices for no good reason.
> >>
> >>Mike H.
> >>    =

> >>
> Thanks for the response Mike.
> I have.  And the exact response I've received so far--because we said =

> so.  And yes, it definitely will kill low voltage devices.  And it's not =

> just supposed to be a sample, it's 100% of production.  This is the same =

> project I asked the testing engineer how to calculate DC power -- and he =

> didn't have a clue!  That's why I'm getting very suspicious of this =

> organization and I've had more than a few hackles raised over this projec=
t.
> =

> Bill
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Ruben J=F6nsson
AB Liros Electronic
Box 9124, 200 39 Malm=F6, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
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