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Hi All,

I'm not an electrican, i work in the events industry and we have quite a bit of plug and play distribution. I have just recieved a 63amp single phase (blue C form) plug on the end of a cable and was surprised to see it had the usual three pins but now a forth smaller pin shortert han the rest.

I googled it and it seems to suggest this is a refernce pin and it is used to check there is a good earth befroe current can flow. Is this right. if anyone could explain what this mystery forth pin is and how it works i would be really grateful.

Thanks Andy
 
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