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I bought this AC adapter from the US to replace a broken Australian one. Unfortunately, the power brick is keyed for use with the polarised C7P plug. Unpolarised C7 appears to be the standard in Australia as I cannot find any polarised C7 plugs with Au sockets. And the AC adapter has the Class 2 symbol (double square). My question is whether I can plug a standard unpolarised "figure 8" style plug into the polarised adapter since they physically fit? Will "C" work with "A", or is only "B+A" safe? Do I have to orient the male plug a certain way?enter image description hereenter image description here

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Navoda Punchihewa
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The keying is designed to prevent dangerous combinations, so if it fits it should be fine.

colintd
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  • I've read that appliances themselves do not care about input polarity. But safety wise polarity matters only if the appliance is not double insulated. That is, as long as an appliance is double insulated, input polarity should not matter, in terms of safety either. Is this true? – Navoda Punchihewa Aug 30 '23 at 10:45
  • Non-double insulated mains devices normally need to have an earth connection, so the relevance to these non-earthed connectors is limited. More than that, over the years I've seen two instances of sockets with L-N reversal, so I would not want to rely on that anyway. – colintd Aug 30 '23 at 18:31