Colleagues,
EN 55024 calls for surge pulses to be applied line-to-line and line-to-earth on
the AC mains port and line-to-ground on signal and telecommunications ports that
connect directly to outdoor cables. However, if my EUT is encased in plastic
covers and has no direct earth ground connection (class 2 power supply), is the
line-to-line test on the AC mains the only surge test that I need to apply? It
seems to me that performing a line-to-earth test on either the AC mains port or
on signal/telecommunications ports is not warranted since the basic standard EN
61000-4-5 does not specify placing the EUT over a reference ground plane. With
no reference ground plane and no direct ground connection how can a test be
applied with respect to ground?
Jim Hulbert
Pitney Bowes
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