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is it possible for the electricity network operator to monitor the integrity of the Neutral conductors around a network? if so, how is this done?

can anybody identify the exact model of this fusebox? from memory it has Merlin Gerin DP MCB's in it. thanks

I seem to recall that there is a little tab that pops up inside the window of a teleswitch to visually indicate which of its 'outputs' are energised... is such a facility common to all of them?

How do radio teleswitches receive the switching signal? I recently had an "issue" where a teleswitch controlled storage heater circuit was apparently not energising in the periods when it should have been energising. it appears to have cured itself. This happened at a time when the property in...

the aico system is interesting indeed, a lot of function for the money. I had never seen them before. The mic idea is a very good one. was it at all tuned for the piezo bleeper or just a wideband noise amp?

It's to provide an auxiliary closure to operate an autodialer. The Kidde system appears to float the line in normality and then swings to +9Vdc in alarm condition. I wondered exactly how "proprietary" the interconnect might be across different manufacturers, mainly out of interest. My kidde...

Anyone know how does the interlink system work on wired mains-powered domestic smoke & heat heads? if so, please might they explain? I mean, I know that they use a separate conductor for the link, but what signaling is applied to this line by an initiating head to ensure that all the other...

so lucky

I think that the sign is supposed to allay any "death ray" fears amongst (Daily Mail reading) travellers. I did not raise it with anybody at the airport for fear of subjecting myself to an "enhanced" search.

Not strictly on-topic but I felt the need to share this amongst pedants. seen at Glasgow Airport yesterday.

True. I had noticed that the insulation is not 1 layer of pvc, it is something (slightly) tougher indeed. the DI classification may well be defensible. My main justification for earthing the backplate was the little HF LED driver module. I have seen enough of them fail catastrophically to...

I didn't use any diodes in my mod...? I will see if Trading Standards are interested in this. Harking back to post nr.3, where B-A-S implied that I have made the light more dangerous. I have taken some pains to illustrate the hard facts of this case. in light of these, have I actually made the...

I have just ripped off a tired old internal wall. The composition of the old wall is/was: studwork: 12mm plasterboard : 12mm plasterboard : 4.5mm faced ply the only reason it came off was that the faced ply "trawler-wall" was deemed aesthetically displeasing. I have discovered that I can...

Yes, exactly. The voice of hard practical experience there.

No, absolutely - it seems very unlikely that the case could become live. this is said without the benefit of the same hindsight that led to CPC conductors being installed as a matter of course. On a well-made product, it should naturally be very unlikely that the case could ever become live. but...

Double Insulated means that there are (at least) 2 insulating layers between the user and the juice. Maybe "Air" can be one of these insulating layers. (?) somehow I doubt it.

The enclosure was and remains an exposed conductive part (or exposed-conductive-part, if the hyphens are important - or did you mean to write Exposed Conductive Part?). I think that is basically my point. the product is marked double insulated. the product is not double-insulated. Is it? ...

Indeed; I took said isolated and exposed piece of metal and connected it to a CPC. In its original incarnation, if a "line-to-chassis" fault had developed, the exposed metallic chassis would have become line potential and likely no disconnectors would have functioned. In its modified state, if a...

I did say comments appreciated..? ok - more dangerous - this is what I was afraid of - break it down for me B-A-S, please!

always keep your back to iffy electrical installations, especially when energising! Nine times out of ten, if it doesn't go bang right after you throw the switch, the job's a good 'un.