Hello,
I am trying to understand the relationship between IEC950 (US/CSA deviations) and NFPA 70 in regards to what I believe would be defined as "interconnecting cables". In particular, I am looking at the circuit between a device port on the system and the external device which connects to that port. I am not considering direct connection to telecommunications, but interface connections to devices such as printers, scanners, and other things which exist. Assume that these products are desktop or deskside. They are not in a computer room. It appears that UL/CSA section 3 covers this and either the circuit meets the limited power source requirements of tables 8 or 9 section 2.11 or it must be shown through abnormal testing that no hazard exist under single fault conditions. Do you agree? Table 8 and 9 come from Article 725 of the NEC for Class 2 and Class 3 circuits. If the limits of these tables are not met, what does that mean as far as the NEC is concerned. Does it simply mean the circuit is not Class 2 or 3? I hope this makes some sense. If not ask some questions and I will see if I can clarify what I am asking for. Regards, Bob Brister Digital Equipment Corp. Corp. EHS
