Hello John, I agree with Ted but would like to add that insulation of wire shall not be subjected to abrasion.
Best regards, Bostjan From: Ted Eckert [mailto:000007cf6ebeab9d-dmarc-requ...@ieee.org] Sent: Wednesday, September 13, 2017 3:45 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Separation of Circuits Hell John, The construction is not specifically prohibited. The wiring for hazardous voltage primary and secondary circuits can touch user accessible circuits as long as the requirements for double or reinforced insulation are met. If you have a line-voltage wire, and you can guarantee that the nominal minimum thickness of insulation will be at least 0.4 mm, IEC 60950-1 will allow that wire to be in contact with user accessible low-voltage circuits. I've also seen insulating sleeving used to provide a second layer of insulation on wires with jackets less than 0.4 mm thick. This may be somewhat of a simplification, and I haven't described all of the potential problems with this approach, but it is method that generally is permitted. Ted Eckert Microsoft Corporation The opinions expressed are my own and do not necessarily reflect those of my employer. From: John Allen [mailto:jral...@productsafetyinc.com] Sent: Wednesday, September 13, 2017 4:47 AM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] Separation of Circuits Hi, I'm struggling with a separation of circuits issue. The Standard I'm using is UL60065. Many other Standards allow wires of different voltages to be in contact with each other as long as they're both rated for the higher voltage. UL60065 doesn't have a separation of circuits section and I cannot find anything that allows wires of different voltages to touch each other. Paragraph 8.5 allows for short circuiting. Section 13 is creepage and clearances but I cannot find a requirement that will allow a low voltage wire to touch a line voltage wire even if the low voltage wire is rated for the higher voltage. I noticed 60950 and 61010 don't seem to have this allowance either. For 60065, can anyone point me in the right direction? If 60065, 60950 and 61010 don't allow it, can anyone explain why these standards don't but others do?? For reference, some that allow it - UL508A (Control Panels), UL73 (Motor Operated Appliances), UL499 (Heating Appliances). Any feedback is appreciated. Best Regards, John - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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