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I've never heard of the "Institute of Engineering and Technology". Is it American? :wink: Anyway, it's wrong when it states that "non-notifiable work is required to comply with the technical requirements of Part P, including BS7671 requirements for inspection and testing and the issuing of a...

Before Economy 7 and E10 tariffs were introduced in the 1970's there were separate meters and CUs for Restricted Hours (off peak) circuits. They were discontinued three decades ago.

Nearly all DIY work is simple; all that for which there is no need to notify is. It's completely OTT to suggest that the full range of tests in BS7671 are necessary for these simple works. It's unreasonable to suggest that a DIYer should acquire professional test gear costing £100's for his...

That means the OP would have to run an extra core the length of his hallway to connect the two lamps. That may not be easy. A way out would be to use the yellow core to connect the two lamps. Disconnect yellow from terminal 2 and disconnect both blue lamp connections (leave yellow...

Deleted by Stoday

You did use 3-core & earth cable didn't you?[/b]

They must be horrid green snots if they are to contain strong enough toxins to damage the cable.

It's not possible to answer that because you don't say what the reflectance of the horizontal surfaces is. For example, if the work surfaces and floor were in white marble, you would expect reflectances to be ~70%. 70% of the light falling on the horizontal surfaces is reflected upwards to...

Of course you can. I operated on my granddaughter's tooth that had broken. It left a sharp corner that was cutting into her cheek. I smoothed it off with a diamond file. She was very appreciative.

Why should a DIYer bother with calibration certificates? I don't bother to get any of my DIY measuring tools calibrated. I don't bother to get the speedometer on my car checked or calibrated.

Yup, strange things happen when div.B does not equal 0 Click for div.b<>0

Common sense would tell you that not all DIYers are incompetent. Some are retired electricians, some work on big industrial and commercial installations. They have to pay the cost of notification even though they are competent, so they have a motivation to avoid notification unless it is...

The original honest, before privatisation, basis on which the E tariff was set, was that an average domestic consumer would pay the same on an E7 tariff as on his normal tariff, except that the standing charge would be a little higher to reflect the extra meter cost. The night price was set to...

That shows that electrical engineers are vastly superior to rocket scientists. Take a look at Maxwell's Equations which underpin electrical engineering. Indeed, Maxwell's equations are to electrical engineers what Ohm's law is to electricians. Anyone who considers himself an electrical...

Electronic kWh meters normally have a flashing red LED. There should be a caption saying how many flashes/kWh or Wh/flash so that you can check low consumption.

You could replace an existing MCB with an RCBO. Replacements are not notifiable.

Better still, choose a nominal voltage that's nearer to the typical supply voltage. E.g. 245V +3%, -12%.

In theory. But we live in the real world, where (in the UK) the voltage at a socket could be anything between 205V and 253V. If the appliance is a pure resistance, such as a heater, the current would be between 58.1A and 71.7A [A = P/V * E/V, where V = nameplate voltage and E = actual...

Your wiring's 50 years old, if you can get away without rewiring now, the need will crop up in the not too distant future. The house would very infrequently be like a building site. Probably you'll have to rewire before it is again, so the rewiring will be far more disruptive. Take...