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Oil injection points perhaps, to seal the dead cable ends from drawing moisture. You've found one end of a cable set, now where's the other - a nearby substation maybe. The background view doesn't suggest an industrial site. As has been mentioned, was this part of a cold-war contingency...

I suspect the unit is fabricated from several 10s of thermocouples wired in series such that we have a multiplicity of connections such as : A-B + B-A + A-B + B-A + A-B etc The fabrication problem of course is ensuring the A-B couples are on the hot side whilst the corresponding B-A couples...

The above two images shows a thermocouple fan sitting on top of my woodstove. The differential heat between the lower and upper sections of the fan generates sufficient power to run the fan motor.

As promised in response #31 I've done some tests on the two old gas valve tripping solenoids that I had in my junk box (see response #20 for photos). Although measured results were quite varied, the typical values were as follows : Force required to overcome the solenoid plunger spring was...

Just an opinion :- If your boiler is going full chat and there's a power cut - what happens - a 2kw dump radiator won't handle the thermal load Apart from the above you need a pipe-stat on the flow out of the boiler to turn on the pump when the boiler gets hot. You also need some form of...

From recolections of working in the calibration of such relays some 60 years ago the solenoid tip was invariably copper to ensure the reminence didn't hold in the de-energised armature arm. In the servicing of these within the nuclear industry we would burnish the contacts with chamois leather...

The thermocouple per-say doesn't need an earth but by virtue of it being connected to the structure of the fire/boiler it's outer skin is earthed. When the remote end of the t/c tubing is connected to the gas valve there is both mechanical and electrical connection between the tubing outer and...

Magnetic 'power' is generally quoted as "Ampere-Turns" ie product of current in the coil times the number of turns in the coil. I think we've created a cardinal sin by hijacking Peter's thread

Harry,John, Your experiences may indeed be in seeing solenoids with many turns of thin wire. On dismantling a pair of gas valves my findings were very different. For some reason I decided to keep hold of the solenoids (maybe to test thermocouples at some future date) but no matter. I dug into...

The ones I discected had a few thick turns within the 'solenoid' section which held open a sping-return plunger style pilot valve within the main gas valve. The pilot valve being what controlled the main gas port operation. There are no doubt many variations on the theme of gas valve design.

I think you'll find a thermocouple flame failure device does not tie into the electrical control system. Rather, the current from the thermocouple is used to directly operate on a small solenoid contained within the main gas valve. The thermocouple output voltage is quite low but has a fairly...

It's got nothing to do with the house 'earth' as such The flame detection system relies upon a minute ionisation current (microamps) that flows between the ignition electrode and the body of the boiler structure (which is normally earthed) The boiler structure is itself is indirectly connected...

You are missing critical parts from the main burner and the small one at bottom left.

An interesting question for which I cannot provide a definitive answer - however you might want to consider the following:- Some flame ionisation type detection systems use the earth of the boiler as part of the detection circuit. For this reason they are 'polarity' sensitive ie the live and...

Sockets used to be designed such that the screws (nickel-plated brass rather than the cr4p steel ones of today) such that the screw dome head sat flush with the socket surface and acted on a bushed hole rather than the faceplate plastic. Whilst preference is subjective, regrettably price now...

That's an interesting wallwart you're using. Most generally have bottom-outlet cables.

If you have a towel rail with a blanking cap at the top you can syphon water from it to make 'space' for adding the chemical into the towel rail. The chemical will then circulate through the complete system if all radiator valves are open.

Hot water entering the towel rail always rises to the top, (convection) but generally all bars will get to more or less the same temperature. The TRV limits water flow depending upon its setting and the room the temperature If the TRV permits high flow the towel rail will be hot; if the TRV...

Is that not why we originally had BSI instead of the silly CE cr4p where any Tom Dick or Harry felt free to mark equipment such

If you go to the above site, scroll down the page and look at the photos you'll see an excellent example of how NOT to wire the plug https://www.amazon.co.uk/Masterplug-HDPT13B-MP-Heavy-Rewireable-Black/dp/B07B9YZHYL/?crid=3K8LK5K8W9NS1&tag=diynotcom-21