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trying to fix a dysfunctional booster-starter-charger. there is a large chinese relay (part nr WJQX-38F-2H) which has a funny little set of diodes which seem to ahve been connected across the coil terminals. I would have expected a diode in this position on a DC coil but Im not sure what the...

does SY cable have a practical place within any interpretation of a British Standard? what is it actually for? why does it *always* have a transparent outer jacket? in my own provincial orbit, the popular view is that it is Armoured Cable. I believe that it is strictly not armoured. I...

A friend has a Worcester green star heat slave ll, he diagnosed problem - weather had got into control PCB and caused a mains short on the PCB which destroyed part of the track. he took the PCB to me and I cleaned it up, repaired the tracks, meggered the mains input line which was OK at 250V...

I have an idea but I'm sure I am missing something possibly to do with efficient power transfer, hopefully some of the erudite contributors to this forum can comment: Consider a cheap "chinese" wind turbine. nominally 24V 400W, price about £140 ex ebay. They are what they are. Ive got experience...

please can I get a bit of help in reading table 4.4(i) in the OSG. Is the idea that you simply size the earthing conductor relative to the line/neutral conductors? I dont know how else you would do it but wanted to make sure my interpretation of the table is correct.

please can someone give me a steer on what 543.3.2 is? I cannot find it in my OSG. Context is "Condition and accessibility of main protective bonding conductor connections (543.3.2; 544.1.2) requires further investigation without delay." thanks

when did the familiar 13A plug get half-insulated pins on L & N?

please can wiser people comment on the below: if I ask for an Economy 7 tarriff, will the energy supplier arrange for a new meter to be installed? Does an economy 7 meter come pre-preogrammed with the low rate periods? can I get an aux output signal from the meter to enable me to...

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...

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...

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.

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...

Anyone know where I could replace this little doofer or what it might be called? Im getting fed up with poking the earth hole to plug it in. cheers

anybody got any experience with waste oil heater control boxes? namely in this case, Honeywell TF834.3 (rebranded as satronic among others) My question is regarding the oil preheater, and how it is supposed to be controlled. The datasheet of this module shows timing diagrams on p.3 Terminal 6 of...

Still trying to get to the bottom of what this 2-rate tarriff with bulb is. this is the "tarriff details" from Bulb energy. This is literally all I can find, but I think there ought to be some clause in the contract detailing how much night-rate is available in a 24 hour period... shouldnt there ?

installed this recently. anyone had any similar issues?

Property with "total heating total control" installation from back along. I believe that the heating (4 x old mass storage + immersion) is controlled by a radio teleswitch; I believe it relies on a signal embedded in the 198kHz service which is then decoded inside the teleswitch module. anyway...

Anyone know how Bender LIM's work in some depth? this is what they give on their datasheets: "A measuring current in the μA range is superimposed onto the system which is recorded and evaluated by a microprocessor-controlled measuring circuit. The measuring time is dependent on the selected...

when using 12V or 24VDC inverters (or indeed inexpensive inverter petrol generators) to power standard 240VAC computer equipment, what are the implications of the noise inherent in such inverters? people talk about electrical noise from inverters, and "dirty power", is this really a thing?

I opened up a 1970s vintage sewing machine treadle the other day expecting to find some triac type chopper controller but instead found a weird plunger type of thing with what looks like carbon rods either side. what's the mechanism? I guess I should post a pic but its in the shed and I cant...