Shower isolator switch usually will have markings to show supply in & supply out. Turn off the mains, use a voltage tester to see if the ciruit is completely dead and sort out the isolator switch connection first before going ahead. Best of luck.
I had a similar issue where a particular element (the rest three were OK) kept tripping the RCD but the circuit tested OK. I simply advised them either to replace the oven or not use that element; they now use the oven minus an element.
I have come across links to the garage simply spurred off the kitchen ring, either FCU'ed or not. Trace your garage link cable back to the house supply and you will get clues, also look if the cable is damaged (snapped) on its run. It's simply a question of applying the logic and playing it...
Those are the ones I stumbled on when did a search and I have simply posted those links. As you would have noticed, they don't have my name on them!
As far I am concerned I do not see the need to put down any code on them. malcolmsanford probably made it clear in his post.
I always carry a set of screw drivers, pliers, cigarette lighter and a small knife (for my wife to peel oranges on long journeys) in me glove box, is that considered as against the law? Would police use common sense in these situations?
PIR should be done by a competent person (not sure what you make of that term) and I have stumbled upon this link when I did a search for sample PIR form http://osborneelectricalservices.co.uk/Documents/Sample PIR.pdf
Forget about Yell or Thomson Local and go to Gumtree; it really worked for me. People tend to use Gumtree if they want to find someone local to resolve their issues.
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