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Thanks RF Lighting - can you explain what this wiring type a bit more please?

Cheers. I'll try and identify the switch wire and mark it accordingly for future reference.

Some spotlights I have were flickering so I turned the power off and had a look at the wiring - I found a loose wire and tightened it up, nothing difficult there. I did notice that the wiring was a bit strange thought (see pic). There are four cables into the internal connector block in...

it's a 9.8kW shower and the run is approx 13m about 6m of which is in the loft. It terminates at the CU with a 45A MCB - the unit has RCD protection. As far as I can tell it's 10mm cable.

I'm putting new insulation in the loft. Existing shower cable is just clipped to the ceiling joists with approx 100mm insulation on top - it's not long enough to put above the extra new insulation, which will be 200mm in addition to existing. I've done some calcs and with the extra...

I'm installing top-up loft insulation perpendicular to the existing stuff. Is it okay that the insulation touches the roof rafters? My roof has one of those 'W' shaped trusses, which means that it's pretty unavaodable that the insulation touches the truss, even towards the centre of the...