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Because some MIs used to specify that, and even where they don't, gas fitters don't know the difference between "must have isolation with min 3mm contact clearance" and "must use a fused connection unit with BS1362 fuse and min 3mm contact clearance". When mum's boiler was replaced, they removed...

A lot depends on when it was built and what sort of person built it. You may find pipes cast into the concrete - as in pipes laid, and concrete poured on top. Obviously zero scope for maintenance/alterations without digging the floor up. For good measure they'll have made no attempt to insulate...

TBH I don't know unit rating, just that the plan is "road moveable" and "multiple units per site". Imagine a giant multi-slot toaster. I wasn't being serious. It's frightening that policy decisions are being made by people who do believe it.

Indeed, but I was actually thinking more the other way around. If we assume (as it's quite likely) that the habitats would be "tin cans", then all the electrical cabling will have capacitance to it, and since (as you point out) that will (on the whole) apply equally to all phases, it will create...

That is indeed the idea. At present, each nuclear station is almost a one-off, with a lot of site-specific design - which means long lead times, and a partially new safety case for each one. Hence very long delivery times and expensive. The idea with the SMR is that the basic design is standard...

So this will become an inaccessible junction then ? Several things wrong here : 1) If a junction is inaccessible then it must used maintenance free connectors - such as Wago in the correct enclosure. 2) Even if boxed in, it needs the cover on - which you can't do if the cables don't use the...

More like setting up some large outdoor event with multiple "mobile" units, power distribution, and all that goes with that. So unless you do everything right, a fault in one unit can create a hazard in other units. And that's the same whether it's AC or DC. Edit: also, EVs aside, vehicles are...

Everything conductive. It won't, but that's not important. You seem to be working on the assumption that the system is so isolated that you could touch a line conductor and not get a shock. In reality, an installation of any size will have significant capacitance from all conductors to...

For exactly the same reasons as we earth power systems here. To an extent, yes. But going DC isn't as simple as it first seems. If you have battery storage, then you have choices to make : DC-DC conversion (both ways) between battery and bus to maintain fixed bus voltage. There's power loss...

And while they are fixing the main problem, they could also fit the correct earth connection. That clamp is not permitted for that application.

Is that https://en.m.wikipedia.org/wiki/Life_on_Mars_(British_TV_series) with John Simm & Philip Glenister ? If so, brilliant series and had me guessing wrong all the way through. Also watch the follow on Ashes to Ashes. Fire up the Quattro !

Gave it a go, the cap came off without too much of a fight, luckily to person stood next to me spotted where the little spring went on the floor - and I was being careful :rolleyes: 4off AAA later and now the display has stopped flashing "r", now it just shows "0" and the red light flashing...

Thanks, I'll be that way tomorrow and give it a go.

Thanks. So batteries in the tube sticking up on the left, and it unscrews ?

Then they are mistaken. There can indeed be issues in that boilers need a minimum flow rate - basically no-one makes a boiler designed to work with the inherently variable (down to "very low") flow rate of a fully controlled heating system. So you do need to ensure a minimum flow rate - either...

This is in the tank at the church hall, I suspect the battery is low or flat. A while ago the display was alternating between a reading and "c", now it's showing "r", and the red LED is flashing. When I try searching for instructions, I get lots of hits for the newer types, but few that look...

I have actually been on a tour of a place doing ice cream - I vaguely recall it was a dairy and did other stuff like yoghurts etc. If you just try freezing the mixed ingredients than you will get a "gritty" texture with ice crystals. The way it's normally done is the mix is passed down a metal...

And it's also an (illegal) way of home fortifying wine. Freeze it, pick out the ice crystals, wine now has a higher alcohol content. Many years ago (back when 8 bit computers were still something of a luxury as a home item), a friend told me how he'd written a program to calculate how much ice...

I guess it would depend on the design of the freezer. I assume ours is similar, but I know for certain that my parents old upright had an expansion coil in the top (above the storage cavity) and a fan to circulate the air internally. The defrost would only heat that expansion coil (electrically)...

Upright vs. chest is an old discussion. AIUI it's usually down the chest freezers generally having better insulation than uprights. The difference in "stored cold" between pre and post defrost cycle would be minimal IMO - not a large quantity of ice, and being water ice would not help much. My...