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Originally Posted by Gordon
Just to lighten things and amuse you, the following illustrations appeared in 'Everything Within' - A Library of Information for the Home (now long out of copyright). We've come a long way since the old dc mains days.
Gordon.
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This reminds me when we used to charge accumulators for a bookmaker (betting shop) to check polarity of the mains all you need is the bare ends of the flex and a glass of water,dunk the wire into the water and the one with the most bubbles is the negative (hydrogen).