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PCBs were more expensive than oil and were only used for indoor transformers where the fire risk had to be accommodated. E.g. in a factory area and not in a separate substation attached to the factory. The transformer in the illustration is a rather ancient but otherwise standard oil filled...

Split phase transformers were used for working from single phase 11kV lines, i.e. HV lines with only two conductors instead of three. Cheaper in rural areas with low loadings. So the transformer is single phase, has an 11kV primary and a 480V centre tapped secondary. I say 480V because I...

Back in the 1950's when I was training with East Mids EB, the standard procedure was for the engineer who isolated the cable to demonstrate it was dead by sawing part through it with a hacksaw. I think there was one spiking gun for the whole depot, but it was rarely used, only when the...

Seven pages and no one has yet calculated the load of the oven correctly! This oven's rating plate says 18.5kW, 415V. So the oven current for 415V is 18,500 / (√ 3 * 415) = 25.74A per phase. But it's connected to 400V mains, so the current taken by the appliance is 25.74 * 400 /...

This utterly incompetent use of English suggests that the author is equally incompetent in other fields too. So no one's going to believe what he says in electrical matters.

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This utterly imcompetent use of English suggests that the author is equally incompetent in other fields too. So no one's going to believe what he says in electrical matters.

Watch the voltage rating of anything used to connect a single phase circuit to the three phase system.

In WW2, before ring circuits, my grandmother referred to the two sockets in the house as "electric plugs". These comprised a surface mounted switch with two holes on top. The plug top plugged into the top of the electric plug. .

Thanks for that BAS. Interesting because when I built my house in 2005/6 local authority building control was not notified of anything. The reason was that the NHBC undertook the BC role.

Qualifications are not required to issue a valid EIC. Only competance. The council has no part in the issue of an EIC. Indeed there are many EICs issued for non-domestic installations that are not subject to Part P. There is no provision in the part P documents for the council to demand an...

Is there a big flash on page 3? :D

Careful! too much pedantry might turn you into a BAS. Moreover so might I... Where does the Approved Document say that? Where does the Statutory Instrument on the Building Regulations say that? :mrgreen:

If you want an installation that complies with BS7671 then you have to complete an EIC. You can copy the EIC model form from Appendix B of Approved Document part P. There are two EICs, one for one person to complete the whole installation and the other where different persons complete the...

That regulation has been included in the regulations for a long time — certainly in the 13th edition which was current when I worked in contracting. I used it for just what Holmslaw says it's for – to connect between busbars and switchfuses. Regulations are worded to generalise the situation...

The fuse wire's only mounted correctly in one of the fuseholders. Either donate it to a museum or auction it at a real (not ebay) auction.

NICE values life at around £30,000 a year ("Quality Adjusted Life Year). Interestingly that equates to the cost of a patient with cronic kidney disease, needing hæmodialysis three times a week to stay alive. The UK could not be the only 1st world country that refuses treatment to patients...

No reason why a competent DIYer should not sign the design and installation boxes in the EIC, leaving a registered electrcian to do the testing and to sign the appropriate box. It has to be notified though unless all the signatories are registered. In the case of this thread the registered...

If the relay is interrupting inductive dc loads, the contacts might well have magnetic arc quenchers. Not your run-of-the-mill stuff. I would have thought that rewinding the coil would have been straightforward. You can measure the diameter of the wire and weigh it after stripping. Google...

It could have been worse. Others have found that they couldn't shut the door after installing the sink. :lol: