Re: IEC-320 coupler in non-standard use
Greetings, Please note that IEC 950 and all its clones, specifies in Clause 2.3.8, last dashed paragraph: --SELV CIRCUITS shall not use connectors compatible with those specified in IEC 83 or IEC 320. Very straightforward requirement. It doesn't mention or imply any exclusions, so this applies to all SELV circuits. Egon :-) At 10:02 AM 02/11/1998 -0500, you wrote: Greetings! I used to work for Lucent Power Systems which is a MAJOR supplier of DC-powering equipment for telecom systems. We used IEC-320 connectors in some of our products in non-AC roles. For instance: we used them as input connectors to rack-mounted DC-to-DC converters (input: 48Vdc; output: 24Vdc) where the IEC-320 inlet on the converter mated to shelf-mounted mating connector. Because the product is used in a limited-access, trained installation personnel environment, UL accepted this application. VDE also accepted this with the caveat that this system be inside of a cabinet with doors. Admittedly, this is a fairly narrow application, but it does demonstrate some flexibility in the use of these connectors which is acceptable to the regulatory agencies. -Jeff Haney Alcatel __ Egon H. Varju, P.Eng. CSA Pacific Region Tel: 1-604-244-6640 HAVE MODEM - WILL TRAVEL Fax: 1-604-244-6600 E-mail:eva...@csi.com var...@csa.ca e...@varju.bc.ca __ - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: IEC-320 coupler in non-standard use
Which brings up the question about whether central office DC supplies which in some countries or circumstances run up to 70 volts should be considered SELV circuits. We do not treat the central office supplies as SELV at Motorola. Isolation is provided in switching supplies as with ac mains circuits. Bob Egon H. Varju wrote: Greetings, Please note that IEC 950 and all its clones, specifies in Clause 2.3.8, last dashed paragraph: --SELV CIRCUITS shall not use connectors compatible with those specified in IEC 83 or IEC 320. Very straightforward requirement. It doesn't mention or imply any exclusions, so this applies to all SELV circuits. Egon :-) At 10:02 AM 02/11/1998 -0500, you wrote: Greetings! I used to work for Lucent Power Systems which is a MAJOR supplier of DC-powering equipment for telecom systems. We used IEC-320 connectors in some of our products in non-AC roles. For instance: we used them as input connectors to rack-mounted DC-to-DC converters (input: 48Vdc; output: 24Vdc) where the IEC-320 inlet on the converter mated to shelf-mounted mating connector. Because the product is used in a limited-access, trained installation personnel environment, UL accepted this application. VDE also accepted this with the caveat that this system be inside of a cabinet with doors. Admittedly, this is a fairly narrow application, but it does demonstrate some flexibility in the use of these connectors which is acceptable to the regulatory agencies. -Jeff Haney Alcatel __ Egon H. Varju, P.Eng. CSA Pacific Region Tel: 1-604-244-6640 HAVE MODEM - WILL TRAVEL Fax: 1-604-244-6600 E-mail:eva...@csi.com var...@csa.ca e...@varju.bc.ca __ - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: IEC-320 coupler in non-standard use
Bob, At 01:31 PM 03/11/1998 -0500, you wrote: Which brings up the question about whether central office DC supplies which in some countries or circumstances run up to 70 volts should be considered SELV circuits. No, if they're over 60 V dc, they shouldn't. By definition, SELV must less than or equal to 60 V dc. We do not treat the central office supplies as SELV at Motorola. Isolation is provided in switching supplies as with ac mains circuits. I agree that this is a sound approach. If you provide reinforced insulation from input to output, then it really doesn't matter if the input is SELV or not. But the original question involved a 48 V dc circuit, which could be regarded as SELV, depending on the actual insulation to the output. If so, then IEC 320 connectors are not allowed. On the other hand, if this input is not considered to be SELV, then there is an exception in IEC 950, if the connector is only accessible by service personnel: Clause 4.3.17:Within a manufacturer's unit or system, plugs and sockets likely to be used by the OPERATOR or by SERVICE PERSONNEL shall not be employed in a manner likely to create a hazard due to mismating. Keying, location or, in the case of connectors accessible only to SERVICE PERSONNEL, clear marking are permitted to meet the requirement. Please note, however, that IEC 320 connectors are clearly specified as being intended for ac applications only. Clause 4.3.17 may be used as an excuse, but it's still basically a poor design. I would strongly *recommend* another connector. Regards, Egon __ Egon H. Varju, P.Eng. CSA Pacific Region Tel: 1-604-244-6640 HAVE MODEM - WILL TRAVEL Fax: 1-604-244-6600 E-mail:eva...@csi.com var...@csa.ca e...@varju.bc.ca __ - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
IEC-320 coupler in non-standard use
Greetings! I used to work for Lucent Power Systems which is a MAJOR supplier of DC-powering equipment for telecom systems. We used IEC-320 connectors in some of our products in non-AC roles. For instance: we used them as input connectors to rack-mounted DC-to-DC converters (input: 48Vdc; output: 24Vdc) where the IEC-320 inlet on the converter mated to shelf-mounted mating connector. Because the product is used in a limited-access, trained installation personnel environment, UL accepted this application. VDE also accepted this with the caveat that this system be inside of a cabinet with doors. Admittedly, this is a fairly narrow application, but it does demonstrate some flexibility in the use of these connectors which is acceptable to the regulatory agencies. -Jeff Haney Alcatel - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
