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Or you could rock it properly old skool with a neon mains tester for £1.99.
Or you could rock it properly old skool with a neon mains tester for £1.99.
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Brommers
Nef
The polarity is unlikely to make any difference. But yes, putting the ends in separate connector blocks and checking voltage to earth from either conductor should tell you which is which L-E 230ish volts, N-E 0ish V (it may have a few volts floating around on it).
There are a couple of cheap options on screwfix. Probably the only time I’d recommend buying LAP products, but seems silly to spend £50 on a voltage indicator just for one job.
Just be careful to keep the exposed metal bits of the prongs away from each other and your fingers!
https://www.screwfix.com/p/lap-ms8922b-ac-dc-2-pole-voltage-tester-with-rcd-400v/669hy