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Don't worry - electrical current is oblivious to colour!

ekmdgrf is right - that is why it says 'must be installed by QE' Good get out clause for manufacturer/retailer when it goes bang if there is no certifcate provided by QE.

Typist.

This is a DIY forum but sometimes you just have to call in a professional.

you would then need to know if earth goes back to MET at fuse board. quickest way would be an earth loop tester to provide a Zs reading.

Possibly not lit at all - glow coming from one of the other neons. Best bet is socket face of and test L-E N-E N-L for voltage at all 3 sockets - at terminals.

HT = Hellermann Tyton (Much better product than Wago)

Unsheathed cables coming down wall and entering CU?

Bit difficult to see but the neutrals to RCDs seem odd. I would have preferred the busbar shield to be removed to see exactly what is happening down there.

Under floorboards I once found an FCU used as a JB. One of the oddest things I came across.

Fill some of mine with wago (actually the Hellerman Tyton ones cos their better) connectors sometimes - lot easier to park earths and neutrals (often put mine in switch). On multi-gang switches one supply twin and earth cable and a separate permanent live to each switch from connectors...

Definitely ectoplasm

Enjoy the hangover! :twisted:

If it was an immersion heater it will probably only have a 20A MCB in place, therefore no FCU required. RCD protection required as posted by PBoD. If you do not have a RCD governed circuit then RCBO will be needed; if rewireable fuses, forget it until you have a new board.

Volt stick = extremely useful indicator for those who know how to use them and know their limitations :) . Neutral must be correct otherwise there is no circuit therefore fan could not have come on.

Vent axia = good product

By the way, you would want to do this testing with the cables disconnected from the fan.

keep power on (just be careful) and have meter set to voltage not continuity.

You can check it this way - not bridge just one prong to neutral and one to the live cable. If you have a functional earth it would be better to test to that.

Make sure the blades are not impeded by any debris or distortion of the unit. Although they spin quickly they are very easily stopped by any foreign object such as a tiny fragment of plaster between blade and body. If you are still unhappy with it take it back as faulty and get a replacement...