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Potentially and actually are not the same thing. Lots of things are done in all walks of life that are potentially dangerous but it rarely comes to pass. It is the enduring negativity that grates. When I read posts it is easy to work out whether people just want to have better understanding...

No. I put forward a suggestion that use for short periods does not necessarily cause enough heating to make it unsafe. That a shower tripping is an inconvenience. It's Sunday and cold outside. What else is there to do?

Oh, they like to give advice. Answering direct questions is usually the hard bit. It's often just the result of software people trying out their attempt at making a Turing machine.

It depends on what form that damage takes. I suggest an MCB that locks closed by being operated somewhere between its rated and actual trip point is in chocolate teapot territory. Damage caused by arcing in a trip is a different issue. The primary purpose of the regulations is to ensure that...

Someone technical could make the decision "it works" too... OK, so if a 7kW shower is replaced with an 8kW shower without a cable upgrade, the I2R heating on the cable goes up 30%. But cables have a design maximum temperature for continuous duty and the specified fuse is intended to prevent...

Difficult to know who/what you are replying to. What you say might be relevant to something I said later on but not to the "second part of my original question" which was

This almost suggests that if we blindly adhere to rules, a retest should be done even after doing something simple like releasing a faceplate for wallpapering.

This comes under the second part of my original question.

A well considered answer.

Polarity, continuity and absence of shorts (eg N nicked when screwing the plate to a back box) are easy to confirm with basic tests so lets assume they're correct. (Though I appreciate not all diy-ers check first.) Then as you suggest, parametric testing is probably only useful for finding...

When testing to BS7671, is this just to keep a record of results or is there a failure criterion? For instance, if a spur is added and it works (perhaps doing basic checks with a multimeter before energising), what value is parametric testing expected to add? If there is a problem not...

Perhaps you expect me to go to the shop and go through the packaging for this product to find out with absolute certainty? Knowing this forum, had I not said "not known" I knew you or one of your buddies would definitely have popped up with some fatuous remark. I thought I had it covered...

Well I only asked for an opinion. If you have inside knowledge, even better.

Yes, I meant elv as did Welshjeff1000. Something like this http://www.screwfix.com/p/lap-fixed-white-12v-low-voltage-bathroom-downlights-pack-of-3/34883 Complete kits can be bought. Not within a zone. But in the sense that they are concerned when things move from outside to within zones 1 &...

Well, my sentence was not intended to be definitive and on reading it back I don't think it fails to be vague. The sentence you snipped also began with "if". At least it prompted someone to clarify. Though when I had a configuration which included a transformer with two lights checked by an...

A definitive answer. A refreshing change for this forum I expect if Welshjeff1000 looked through this forum he would discover how difficult it is to get straightforward facts without useless baggage.

Yep, to turn an engine over it requires power - either from burning fuel or from reducing the car's sum of kinetic and potential energy. These were raised earlier by burning fuel and which will be raised again by burning fuel. So, if you want to reduce KE and PE when you are or will be using...

Depends. Mains only goes to the transformer so this could be considered to be a replacement, not addition. If it is notifiable, then to get the right paperwork, you should in theory put the old light back and get an electrician to put the new one(s) in.

I originally linked some photos of the old setup but have removed them. Rather than being constructive, some people decided to air their large egos. I can't be bothered to reinstate.

Good, my assumption was correct Why did RF Lighting suggest this particular electrician was short of work?