Neven -
While there may be some reliability concern, as John
Woodgate pointed out, it's not much of a safety issue, if
the product has also been subjected to a few of the same
tests normally applied to a TNV circuit. Referencing
IEC60950-1 and assuming the IP telephone is on-premise and
thus remains an SELV circuit, these include:
6.3, Protection of the telecommunication wiring system from
overheating (leveraging off of 2.6)
Also, for Canada and the US, from CSA/UL60950:
2.3.1 TNV limits (paying particular attention to the D2
Deviations)
Regards,
Peter L. Tarver, PE
Product Safety Manager
Sanmina-SCI Homologation Services
2000 Ringwood Ave.
San Jose, CA 95131-1749
V: 408-904-2081
F: 408-904-2095
M: 408-234-3529
[email protected]
> From: [email protected]
>
>
>
> Is there any safety or reliability concern with
> 48V possibly permanently across
> 0.02" spaced pads on a PCB surface? I believe
> safety-wise it is okay, but I am
> not sure if electromigration or something else
> may cause long-term problems,
> since the phones are more-less permanently connected.
>
>
> Thank you, Neven
>
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