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IEC 62102 (Table B.1) declares that for safety purposes Ethernet 10base5 is considered a TNV-1 circuit. Other Ethernet circuits are considered SELV. The internal circuits they connect to in your case are likely to be SELV (although not necessarily, for example they could be TNV3, ELV, or even hazardous). The isolation needed is described in IEC 60950 (3rd or 4th ed) Figure 2F and Table 2G.
The isolation needed for functional reasons is derived from the IEEE specs which have been discussed in other responses. Bob Johnson ITE Safety From: [email protected] [mailto:[email protected]] On Behalf Of Alex McNeil Sent: Thursday, February 06, 2003 2:56 AM To: [email protected] Subject: Ethernet Creepage and Clearance 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] This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstcTitle: RE: Ethernet Creepage and Clearance
IEC 62102 (Table B.1) declares that for safety purposes Ethernet 10base5 is
considered a TNV-1 circuit. Other Ethernet circuits are considered SELV. The
internal circuits they connect to in your case are likely to be SELV
(although not necessarily, for example they could be TNV3, ELV, or even
hazardous). The isolation needed is described in IEC 60950 (3rd or 4th ed)
Figure 2F and Table 2G.
The isolation needed for functional reasons is derived from the IEEE specs
which have been discussed in other responses.
Bob Johnson
ITE Safety
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Alex McNeil
Sent: Thursday, February 06, 2003 2:56 AM
To: [email protected]
Subject: Ethernet Creepage and Clearance
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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