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Sorry about that; I'll try again. By "System maximum demand" I mean the maximum demand in a year that has to be met by generation capacity. Recently the SMD was as follows: 28/11/05 59.4 GW 23/01/07 57.4 GW 17/12/07 59.5 GW 06/01/09 58.0 GW 07/01/10 58.1 GW 07/12/10 58.9 GW The...

They are current transformers. So the primary could be up at 5kV whilst the secondary is (presumably) earthed. That's not 5kV over the primary winding of one transformer, the 5kV being what the primary's insulated for. An open circuit CT can have high voltage over its secondary, but this will...

Omar Khayyám had better things to do than read that lot!

Not just Spain, BAN, but Australia too: http://www.theherald.com.au/blogs/jeff-corbett/solar-dishonesty/2164564.aspx

The issue of other countries' time of peak demand is irrelevant. The UK is a net importer of electricity and does not export it. Even if we did export, the effect of pv installations would be to reduce UK demand allowing more to be exported from conventional stations that are connected to the...

Or you could connect ELV lamps in series. Then all lamps get the same current. Airport runways are lit using series connection to eliminate the volt drop problem.

Jj's right. Cloud is the second most important factor. With an array at the optimum angle to the sun, the same peak energy will be generated no matter if the location is in England, Spain, North Africa or even the North Pole. Northern latitudes would generate less over the year, of course...

For radiation on the ground, the sun is strongest on the 21 June, when it reaches the altitude of 61° in the middle of the England. That's not the case for pv because roofs are at an angle. The sun's energy peaks when the sun is normal to the array, i.e. at right angles to the array and roof...

Now that's a pig-headed response. Recessed lighting does have the merit of low glare. If you want to minimise glare you can do so with appropriate recessed fittings, albeit at the cost of the abysmal luminous efficiency of recessed fittings. If lighting levels are high, 500 lux or more...

Before privatisation, meters were always read. Bills were only estimated if the meter reader couldn't gain access. Now it's DIY reading or bills based on an estimate from previous bills that were based on an estimate... and so on ad infinitum.

You can't have a sensible rule of thumb based on the number or power of lights per square meter because the light level depends so much on the colour and darkness of the floor, wall and ceiling decorations. The best rule of thumb I've come across is that recessed filament lighting should be...

It is indeed crazy. I'm waiting for the day when pv owners are paid not to generate. Sounds crazy? Well, it's happened with wind farms that have been paid £1,000s to stop generating. Click The worst aspect of the cross subsidies in the electricity market is that they are all hidden to a...

I can see no reason whatsoever why the DNO should supply an isolator other than at the consumer's cost. In principle, the consumer chose to have a cheap installation, by integrating an isolator in his distribution board, forming a consumer unit. Having opted for the cheap gear, it's an...

It's not illegal but the cutout belongs to the DNO and no DNO gives you permission to break their seal or to pull their fuse. Indeed, they tell you not to interfere with their equipment. If you do so, you do it at your risk. The DNO has deliberately absolved itself of any risk by not giving...

The Wilson government subsidised the development of the 64k ram. Trouble is, they subsidised the wrong company; the 64k ram got into production in America (Texas Instruments IIRC) and the government's money was wasted. Here the technology became financially viable in spite of the government...

Ballet too The BBC ought to screen all the subsidised operas and ballets. It's particularly unfair that, in a typical year, several operas get screened, but only one ballet if we're lucky.

If you want you can always hammer the cable flat before cutting it.

Can you? Well, let's make a few adjustments so that they really are similar: 1) Make 3D TVs so that they only work during daylight. Want TV at night? Then buy an ordinary TV in addition. 2) That makes a 3D forever more expensive than an ordinary TV, since everyone wants to watch at...

No. RYB indicates phase rotation, so you'd only have RYB labelling to the cutouts if the phases rotated left to right. If the cutouts got wired so that the rotation was from right to left, this would be indicated by swapping Y and B.

Shorted turns are detected and located using a growler Click