bigegg
Scream Not Working Because Space Make Deaf
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It was in response to your casting aspertions on my competence! No offence intended
Yes.
But (long story short):
A radial will be fused at 20A, and run in 4mm cable, so no part of the circuit will carry more than the cable is rated for - even when there's lots of spurs.
A ring is wired in 2.5mm, and fused at 32A.
That means it's easy to have a part of the circuit carry more than the cable is actually rated for: especially if multiple unfused spurs are added
Incorrect, a standard 20A radial circuit is more likely to be wired in 2.5mm
Standard socket radial circuits as per BS7671 are 20A or 32A. The minimum cable size for a 20A radial is 2.5mm, the minimum cable size for a 32A radial is 4mm (except when MICC is used)
You would think regulations would be simple, easy to understand, easy to implement and safe. But it seems as a lay person that's not true in this case.
We used to have a much simpler approach too, it was called The IEE regulations, all regulations in simple understandable english, with no interpretations alloweds or possible, and plenty of definitions. Using these regs produced the safest electrical installations in the world. Now we have the IET regs, a load of language mangled gobbledygook, and what you install depends on your interpretation of regulations that are anything but clear, and in many cases contradictory, hence all the reprints and updates, today consumer units catch fire!The regulations are not simple because electricity and electrical safety are not simple.
The USA uses a simpler approach to regulations and they have what is generally accepted to be a far less safe standard of electrical safety.
Never seen one catch fire though, because the plastic is phenolic and nonflammable, and gives off such a foul smell when it overheats that it leaves the householder in no doubt that something is wrong. The only drawback with rewirable fuses is that people can put the wrong size wire in! Also remeber that a fuse always fails safe, whereas an MCB of RCD NEVER fails safe!The old wylex units also had a wooden base and rewirable fuses, nice and safe!
Golly and there's me thinking you have seen everything, it makes a mess as you can well imagineNever seen one catch fire though, because the plastic is phenolic and nonflammable, and gives off such a foul smell when it overheats that it leaves the householder in no doubt that something is wrong. The only drawback with rewirable fuses is that people can put the wrong size wire in! Also remeber that a fuse always fails safe, whereas an MCB of RCD NEVER fails safe!
The architect said that it will need to be signed off by a "Select" approved electrician. I think there is more than one approval body, they guy who put a new CU in my rental flat had NICEIC on his paperwork.In Scotland, no, I don't have a clue, because the legal system is different, BUT, if you are under part P of the building regulations, and relying on local authority inspection then the inspectorate usually require prior notice that an installation is taking place, and usually want to inspect during installation.
Phil
no they wernt earth bond everything in sight that was metal even a bloody handrail in the middle of nowhere for 3 stepsI have seen a couple of the old wylexes that have burnt out on the main switch and several that have gone on the neutral block, very messy! But the standard back then was a lot better, double screws on all terminals and things were better quality, not just minimum standard cheap tat!
Modern mcbs are terrible, people harp on about torque drivers for workmanship but it's more of a fact that a modern terminal is so cheap and nasty( not even proper brass )
That it will destroy itself if you more than fart at it let alone trying to terminate a 6-35mm cable in it!
The wiring regs have since I started (16th ed) always been as clear as mud and contradictory but I do agree that since harmonized regs with the EU they have been further muddied! I think the 14th or 15th were the last of the sensible sets of regs written!
it doesn't need doing .you cant bond plastic just the gas or oil if u have it in 10.0mm earth wireWhat is the deal now on earth bonding, now that heating, hot and cold water pipes are plastic?
Doesn't stop them trying....it doesn't need doing .you cant bond plastic just the gas or oil if u have it in 10.0mm earth wire
yes i have seen that before 20 meters of earth bonding wire and they get the plumber to put 6 inch of copper pipe between the cold and hot pipe under the sink to bond to so much for so called trained electriciansDoesn't stop them trying....
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Or put a bit of copper pipe in for the clamp...
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