To all grope members,
We would like to design an outdoor unit (radio terminal), metal enclosed,
with unit chassis NOT connected to earth. Unit
consisting the following: Antenna, RF module, digital and DC Power supply
module (powered by 60 Vdc - SELV). The outdoor unit connoted to an indoor
unit (connection box) which consists AC/DC power supply (supply the voltage
to the outdoor unit) via cable (length of 100m) . In this cable we have 2
STP for E1, 2 STP for 100Base-T and 60Vdc supply wires. Cable shield
connected to chassis in both ends.
The requirement to design unit with no earth connection driven from the
fact that there are places were a good earthing connection is not available
(privet house, small office).
1. Is it safe (emc/safety aspects) to have metal enclosed class
II outdoor unit?
2. Suggested solution was designing the outdoor unit as
floating ! Surge protectors will be design as differential. Cable shield
won't be connected to the outdoor unit (Will it cause a cross talk problems
between E1 & Ethernet??) .
Any comments or suggestions will be very welcome.
Zohar (Jana) Zosmanovich
Compliance Engineer, RADWIN ltd.
34 Habarzel St., Tel Aviv 69710, Israel
Tel.: 972-3-7666735 ; Fax: 972-3-7657535
Email: <mailto:[email protected]>
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