It mattered if you were repairing them, 60 years ago!
they would be hard wired the right way round back then.... not a detachable cable that could be turned
 
they would be hard wired the right way round back then.... not a detachable cable that could be turned

Not necessarily. People who repaired valve radios will attest to that.
 

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HappyHippyDad

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If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
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Practising Electrician (Qualified - Domestic or Commercial etc)

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Title
Polarity on this led driver
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UK Electrical Forum
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23

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HappyHippyDad,
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brianmoooore,
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