AS NZS 3123 pdf download – Approval and test specification—Plugs, socket-outlets and couplers for general industrial application 2.2.5 Double insulation Insulation comprising both basic insulation and supplementary insulation. 2.2.6 Integral switching device A mechanical switching device constructed as a part of an accessory within the scope of this Standard. 2.2.7 Interlock A device, either electrical or mechanical, that prevents the...