Not for safety, sorry the 802 reference was from the IEEE 802.3 Ethernet
standards. I forget which section but there is a section on the electrical
characteristics for the port and the wiring. Unless its been changed there is
1500 v isolation requirement between signals and chassis. Quite often that was
handled by separate ground plains between system and the Ethernet drivers. If
you look at a system that has external magnetic you cans see the split between
the input and output of the magnetics. It was there for noise control as well.
If the SELV is earthed (logic and chassis kinda-sorta the same point)
its
functional between that and unearthed SELV, or earthed or unearthed TNV-1,
basic for the rest. Table 2G or figure 2F.
The follow your mains voltage, pollution degrees, and whether or not you going
to see transients and it'll give you the figures your looking for.
Gary
From: Peter L. Tarver [mailto:[email protected]]
Sent: Thursday, February 06, 2003 7:30 AM
To: Alex McNeil; [email protected]
Subject: RE: Ethernet Creepage and Clearance
Ethernet is an SELV signal circuit. Fully IEEE 802.3
compliant products will not require any special treatment.
Just the usual materials requirements regarding
flammability.
If this is a powered VOIP product, there may be some
additional things to consider.
Please be certain to purchase a copy of and read the
standard.
Regards,
Peter L. Tarver, PE
Product Safety Manager
Sanmina-SCI Homologation Services
San Jose, CA
[email protected]
> -----Original Message-----
> From: Alex McNeil
> Sent: Wednesday, February 05, 2003 11:56 PM
>
> Hi Forum,
> Are there any ethernet and PCB safety
> requirements, ie are there rules like
> those for the modem side of things (isolation in
> particular) or is the
> transformer sufficient?
>
> Kind Regards
> Alex McNeil
> Principal Engineer
> Tel: +44 (0)131 479 8375
> Fax:+44 (0)131 479 8321
> email: [email protected]
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