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I intended that the garage had a garage consumer unit such that a 32A mcb/rcbo protected the ring and a 6A or 10A mcb the lights. I really don't see much need for a ring in a domestic workshop. A 20A radial would be better because under overload it would provide some discrimination. The...

But didn't finish it it would appear. What did he do — bu99er it up, do a runner and leave you in the proverbial? Some friend!

Please sir, please sir. My hand's up. I didn't know that the regs on discrimination between protective devices had been watered down. :lol: :lol: Indeed even if "selectivity" is necessary to prevent danger you only need to consider selectivity under the rule. It's fortunate you don't...

Who the a******e is in that sentence is indeterminate. It could be BAS or equally it could be cozycats. On the other hand, BAS seems to recognise the description as applicable to himself...

A non-contact voltage detector will only tell you if is probably live; it will not tell you if it is definitely dead. You won't get any added peace of mind from it.

People change house, on average, once every ten years. As the fit lasts 25 years, there will be a lot of houses sold with a pv system on their roofs. 1) Will you be able to take the pv installation with you to your new house? I doubt it. 2) Will the new owner be able to take over your feed...

I've just come across Hager's surge protection devices. You can add them to your consumer unit. e.g. SPN215R can be added to your consumer unit to protect the circuits from the controlled busbar. Click for cat

In the 1970's cooker circuits were normally wired with 7/036 cable. 7/036 = 4.6mm² 7/044 = 6.9mm²

How can you call him a con-man when he explains the technology being used? i.e. Quantum Resonant Technology. The Quantum Resonant Technology Qx2 and Qx4 are sophisticated Scalar field generators, employing technology derived from research in the discipline of quantum mechanics that allows the...

Niklaus Wirth, who wrote the Pascal programming language, used to grumble that whereas Europeans generally pronounce his name the right way ('Nick-louse Veert'), Americans invariably mangle it into 'Nickel's Worth.' That is to say that Europeans call him by name, but Americans call him by value.

As it's the silly season, did you realise that the regulations allow a twin socket on a 2.5mm² cable from a 32A mcb in the consumer unit?

Table 9C was supposed to adjust the values in table 9A, which provides values of conductor resistance at 20°C.

I'm amazed that the 70°C values should be used for calculations related to cables running at their normal operating temperatures. A footnote to Tables 41.2 etc., which give the maximum earth fault loop impedance, says the impedance given should not be exceeded when the conductors are at their...

Sorry — I should have been more explicit. I didn’t want to teach grandma how to suck eggs. The cables are not run at their maximum current carrying capacity, far from it. So the table 4D2B in BS7671, which gives the volt drop of a 2-conductor 4mm² cable as 11mV/A/m is inappropriate. The...

Interesting. It would appear that EDF has reduced the demand integration period even more so that the maximum demand appears higher. Reduce the integration period to nil and you get the typical household MD of 15/18kW.

I have calculated the appropriate volt drop and yes, you can use 4mm cable provided you feed the lights in a ring, the two ends being connected to the battery. BAS is wrong. He uses the wrong volt drop %. His calculations are only appropriate when the electricity supply is from the public...

I understand the demand integration period for French disjoncteurs was 10/15 minutes. The timing used a thermal element to achieve the period. My experience with French distribution is over 10 years out-of-date; I expect the disjoncteurs will now have microprocessor timers. In the UK...

Exactly so! The value convention has chosen is the nominal voltage. Has worked well, apart from one exception. (gives the impression that CFL equivalent watts are dim). I would suggest that the normal design practice is to optimise a design to meet typical conditions and then to add...

A table that takes 3kg will be good enough for you then BAS. Gravity on Mars is only 38% of that on Earth. :lol:

If an appliance is to be connected to a real circuit, it's implicit that it should operate safely if the voltage should rise to 253V or fall to 205V. If it overloads when it's supplied at over 230V, it's faulty. A base of the nominal supply voltage is sensible. Mrs Jones wants to buy a 100W...