Good day to all. I am having an argument with another person here at work regarding=20 creepage distances between the coil and armature of a JS1 relay=20 (through-hole). This is in a HVAC application, where the coil is=20 controlled from a 24 Vac signal (thermostat or whatever) and the=20 contacts are controlling a fan motor at 120 Vac. I have been using some pretty stringent distances as relayed to me=20 from a European standards agency: Functional Insulation is required between live & neutral. Basic insulation is required between live or neutral & protective earth (gn= d). Isolation equivalent to double or reinforced insulation is required between Extra Low Voltage circuits and any line or neutral connection. Clearance / Creepage distances: Functional Insulation 2.0/3.2mm 0.079/0.126" Basic Insulation 2.0/4.0mm 0.079/0.157" Double Insulation 3.5/8.0mm 0.138/0.315" By the above rules, a JS1 relay is NOT suitable because the distance=20 from the armature pin is too close to both of the coil pins. However, www.creepage.com says that I need only 2.0mm distance=20 between an ELV circuit and the primary mains. In other words, Basic=20 insulation instead of double insulation. Can someone point me towards a (some) website (s) that accurately=20 tells me what the requirements are? Its important to note that the low voltage circuit might be touched=20 by someone (change the battery in a smart thermostat, etc). I think=20 that is why the requirement for double insulation - but I'm not sure. Many thanks! dwayne --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .