Doug - Perhaps you can consider using a 600V rated wire with 0.4mm or thicker insulation and call it reinforced insulation (refer to Subclause 2.9.4.2 of IEC60950 and its variants), rather than looking for two separate levels of insulation.
Regards, Peter L. Tarver Nortel [email protected] >---------- >From: [email protected][SMTP:[email protected]] >Sent: Monday, October 27, 1997 3:01 AM > > >Hello all, > >I have need for double insulated wire in sizes ranging from 22 - 4 AWG and >larger for up to 300Vac mains applications. Currently we often use 600V >rated heatshrink over 300V rated wire, labor costs are very high. > >I have already checked into the "BN" style wire and found that the PVC core >insulation carries the full voltage rating of 600V and the nylon jacket is >only for solvent and abrasion resistance, i.e. the nylon jacket is not >voltage rated. It would be better if each layer contributed 300V for basic >and supplementary insulation. > >We also use in certain cases UL rated silicon or EPDM wire and safety >compliance is achieved by virtue of the insulation thickness and impulse >ratings, not the voltage rating of the wire. This solution does not work >with IDC connectors as the insulation is quite thick. > >We have also successfully used "triple-insulated" wire from Furukawa, but >this is only a replacement for magnet wire in transformers. > >I have found a source for Silicon FEP over Teflon (Rowe Industries) which >makes for selective stripping. This works well for IDC connectors. But >their range of sizes is limited to 24 - 20 AWG. > >Another possibility would be to extrude UL1015 PVC insulation over a UL1180 >Teflon stock wire. The 180C at the core and 105C overlay makes for ease of >stripping as the 2 layers of insulation would not blend. I have not >received any quotes on this as yet. > >I realize that a custom wire like this is not likely to be approved by any >agency but if the acceptance test procedures and construction information >are available then my inspector can review and certify the wire for the >application. > >Anyone have ideas or sources? > >* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * >Doug Powell >Compliance Engineer, [email protected] >Advanced Energy Industries, Inc. >www.advanced-energy.com >* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * > >
