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A piece from a 1970's Gloworm boiler manual ...... It compares the open-circuit & closed-circuit voltages. If the intersection falls within the shaded area then the thermocouple is good.

The LV mains aren't rings. A series of (3 phase) radials will exit each 11kV/400V transformer, via local fuses - these fuses are often in the region of 315 - 650A. Houses, streetlights etc etc will be tapped of this radial as it passes. Some LV radials will supply only a single large user (eg...

The mains voltage can be "all over the place". Above is the 24 hr plot from yesterday. This has been logged at 60s intervals. This is from an urban house on a typical street in a medium sized town.

3183TQ is a Butyl rubber sheathed cable. 3093Y is a PVC sheathed cable. Both would be suitable for the load & the temperature. My personal preference would be the butyl sheathed cable

As far as I'm aware there are no auto-tap changes on the 11kV transformers in the UK. Its 33kV and above. Most distribution transformers are set (using manual off load changes) to have a secondary voltage of 433V off load

I think its an old telephone ringer/repeater. Only was to tell, as Random says ..... let us have a peep inside!

I'm trying to get my head around setting up a Euro 46 to do area set. The scenario is a small factory that has decided to sub-let the upstairs of an office block. These will share a common lobby area. I need to reconfigure the panel such that the tenants can only unset/set the sensors in...

Well no. As I said above, these inverters don't work by synthesizing a sinewave, sync'ing this with the mains & exporting power. Their method is a little different & relies on the MAINS being present (and is the reason why you can't use these devices to build an off-grid system). A brief...

Most of these grid-tied inverters don't work the way you might think - they don't create a sine-wave using some internal clock & then sync this with the mains. They use the mains as their clock - no mains = no clock = no output. This is not the same method as would be used to sync a conventional...

Yes it does, but it needs to be (and is - since the TV schedules are known) planned for. As demand starts to exceed generation then the frequency begins to fall as the kinetic energy stored in the rotating generators is converted at a rate greater than it is replenished. If steps are not taken...

But is the penetration of smart meters deep enough to make that actually work? I agree that, in theory, it would be possible to turn off the output of a smart meter at will (do they all have switches? I'm not sure they do) but would it reduce demand by "enough"? If not, then we would be back to...

I do remember the Winter of Discontent 1978/9 and the previous one with the strike of 1973/4 leading to the 3 day working week - although I was at school for both of these so didn't mind the extra holiday :) I know that there are registers of vulnerable persons but I'm not sure that would mean...

I years gone by it was not un-common to dig one cable from the road & then use it to supply TWO houses by 'looping' the second one from the first. This looping has to be removed if either party wants an EV charger - a new cable will need to be laid to supply the house which has been unlooped...

Hmmm..... The phase & neutral/earth from that split-con appear to go up into the enclosure above through different holes in the metal adaptable box. That's not the best of practices either!

Unless you have F-gas certification, a vacuum pump, set of refrigeration gauges, cylinder of gas & a recovery cylinder..... legally, you can't. I'm afraid to need to take it to a refrigeration engineer and hope it contains a refrigeration gas which is still legal.

I have a 56" xpelair whispair ceiling fan in our bedroom. We are fortunate enough to have 10 foot (3m) ceilings so it was possible to fit the fan so its both out of reach & yet still a good 18" below the ceiling. We run it on its slowest setting (it has a separate wall mounted controller) all...

The refrigeration system should operate with the temperature of the evaporator slightly above freezing. This is to prevent a ice forming on the evaporator. This temperature is a function of the system pressure. A low charge of refrigerant is the classic cause of this problem.

Give us a wider angle view. In particular, show that piece of twin & earth that enters the frame in the upper left hand side.....

Just for the record.... the inverter doesn't export by producing a higher voltage. Its a bit more complex than that.

I thought Fitzgerald went under a few years back? Has someone purchase the name & started to manufacture again?