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there were (are!) 2 meters - 1 for normal rate, and 1 for low rate. the main low rate load (heating) would energise using the long-wave controlled teleswitch (sometimes via a separate contactor) the 24-hour low rate fuse box would be permanently energised, and metered via the low rate meter...

The supply arrangement in question is certainly full 3 phase & neutral. 400V between the line of all 3 fuseboxes. 400V exists within the single dwelling house. each phase has a 100A cutout. I have done work on the property and measured it myself. and Yes - regarding the "24 hour low rate"...

Yeah, Ive always wondered that too. the "Total Heating with Total Control" branded scheme I think is (was) perhaps peculiar to Scotland and possibly had something to do with a way to use the white elephant of hydro-electric pumped storage in the remote highlands. Im sure others will comment...

I have a somewhat unusal residential supply question for an elderly friend (at least in my limited experience it is unusual) 3 phases entering the house I cannot remember the exact setup of the metering at the property (will update when I visit later in the month) but its something like this...

must admit I hadnt really considered that. most people can certainly feel 24V if you are up to your waist in seawater but it's only uncomfortable, I wouldnt describe it as a shock. No idea what it would be like if you were up to your neck, I guess it could start to become dangerous then. I...

Fair enough, common sense. I understand that "the possibility of damage" pertains to sensitive equipment such as computers, radio gear, radar, sounders etc that may well be permanently connected. In the case of a standard 24V DC workboat, I would expect older equipment to be rated max 32V (from...

new requirements for fishing vessels. I am slightly perplexed, it seems that 4.8.2.3 indicates that we may be able to use eg a 48V test for a nominally 24VDC distribution arrangement as found on most fishing boats. or a 24V test for a nominally 12V vessel. But this would be in contradiction of...

Why would this box have been configured in this fashion? It is the distribution point for lights & and a couple of sockets in a modern steelframe GP farm shed. it is supplied via a DP isolator & SWA submain from the main dwelling house. Not too sure about main supply arrangement but almost...

of course yes, didnt think it through. obvious. thanks.

I was trying to work out what precisely had gone wrong here. the problem was caused by fresh water running down a conduit and into the box. seems surprising that the RCBOs did not prevent the whole thing from cooking up in the fashion that it clearly has.

The local professional has apparently been at it all day: "But her sparky was at it all day and couldn’t sort, talked about getting a 3rd replacement trip switch that was older and therefore “less sensitive” but left her with power on to living room sockets somehow with an extension reel to...

Why should the ELCB-v have been removed with the fitting of the EV charging point?

True, I think the general feeling was that my brother's action of "testing" the ELCB had somehow triggered a fault elsewhere. Anyway, the EDF bod has been, replaced the meter and has diagnosed the problem within the ELCB. which sort of fits the circumstances better disappointing result for the...

I have now done so. I feel so foolish.

"voltage operated" interesting. I have yet to meet anything mechanical that is "voltage operated"

that Ottermill Type D ELCB (not a RCD) is fairly simple I believe, but (being an ELCB) it only works on actual earth current flowing in one particular earth path. I imagine that they were used on an installation that comprised a possibly bad local earth spike. Ive known the district in question...

I wondered similar. It is "smart", so I guess that it could display verbose messages etc describing how it feels about what it's connected to. I further wondered whether a volt-stick neon proximity gadget could have been used for his diagnosis which may have led to mis-diagnosis.

if a smart meter like the one pictured contains the facility to disconnect power, how is this achieved? the unit in the picture does not appear big enough to comfortably house a contactor of say 100A capability

Report from the electrician was, power is getting to the smart meter but not beyond it. Not sure how he could have diagnosed this definitively without disrupting DNO equipment, but that's apparently wot 'e said I think my brother would probably have noticed the main fuse rupturing. I must admit...

an elderly female neighbour was concerned that her EV charger (installed outside) no longer had a flashing blue light on it so asked my brother (who happened to be visiting at the adjacent property) to "have a look". also she had said that her smart meter usage monitoring panel had been...