Paolo,
EN55024 does not directly address the issue, rather it refers you to EN
61000-4-4. Clause 7.3.1 states " . . . applied between a reference ground
plane and each of the power supply terminals . . .". The key is "each"
instead of "all". From a purely regulatory perspective, it appears you have
a valid point the way I read the standard. Other standards do indicate
"true common mode" as a requirement. By the way, the "reference ground" may
be at a different potential than "protective earth". That's why a number of
test sets have a test mode to test EFT between PE and ground reference.
Check out the bonding and set up requirements carefully.
However, a weakness in the design has been detected in "true common mode"
test mode. Are you confident that your customer will not be bothered by the
design weakness, whatever those manifestations are? Of course that is a
quality issue, not a regulatory issue.
Good luck,
Don Umbdenstock
> ----------
> From: Roncone Paolo[SMTP:paolo.ronc...@compuprint.it]
> Reply To: Roncone Paolo
> Sent: Wednesday, June 07, 2000 11:45 AM
> To: 'emc-p...@ieee.org'
> Subject: EFT/Burst
>
>
> Group,
>
> we are currently discussing with one OEM the interpretation of EFT/Burst
> test requirements per EN55024 and EN61000-4-4 to a printer.
> Specifically we are discussing the requirements of application of bursts
> to
> AC power lines. Our understanding is that they must be applied between
> each
> (single) power supply conductor and reference ground (or protective
> earth),
> as specified in EN61000-4-4 section 7.3.1. Also fig.4 and fig.11 in the
> same
> document seem to confirm this.
> Our OEM customer says that all combinations of phase, neutral and
> protective
> earth should be tested. They actually tested both singular AC lines and
> also
> more than one AC line. The printer passed the test in the first mode and
> failed in the second mode.
>
> Any comments / interpretations would be highly appreciated.
>
> Paolo Roncone
> Compuprint s.p.a.
> Italy
>
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