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Are you sure its a lightswitch? Sounds to me like its a 20A DP switch. They can look rather similar

Pyronix will only point you to that page if you registered with them as an Installer. They would not do this as a User. I sort of take your point about being a halfway house.... but many monitored systems are configured this way so that the Alarm Company knows that the system has gone into a...

Well, that's completely buggered setting any more panels to anti-code restore! No point now, every Tom, Dick & Harry knows how to do it.

I agree. Been on their (coax) broadband since 1997 & I think we've been without service for about a week in 23 yrs. Slowly watched the data rate rise from 1mbs to its current 100mbs but I feel I'm being penalized for being a loyal Customer by the price-racheting - every year the price goes up &...

Anybody using it yet? I've noticed that the PON connector boxes have appeared on the poles down our street so its on the way. The BT page suggests that I can order it ... upto 900Mbps download (450 guaranteed) with 110 Mbps upload for £59.99 per month. Seriously considering moving from Virgin.

Your second pic shows an XP95 sensor head. The row of 4 & row of 3 'pips' that you can see 'read' an address strip that is placed in the base. These strips have matching knockouts that press (or not) the pips in when the sensor is fitted on the base. Sometimes these unintentionally break off...

MODBUS is just a protocol running often (but not always) over RS485. There is also MODBUS-TCP which runs over ethernet. The MODBUS protocol is quite old now but still very much alive. Many instruments & sensors are available with a MODBUS interface - its very easy to write a driver to pickup...

Gents, I think we are panicking about the mains voltage too much..... its by no means constant anyway. This is a plot of the mains voltage at my house today from the UPS log. The voltage has varied from around 233V to around 248V. Its by no means an unsual day! 230V for our UK voltage is a...

If it can 'see' through the frosted panel of the door then it isn't a PIR - it must be microwave. If its microwave then covering it with tape won't work either.... if it can see thru the door then....

Me neither, that was the problem!

Indeed. But its not as much 'fun' and doesn't help with the understanding as much fun as doing it from scratch. The EXCEL model I've built will allow me to change the value of the 'line' resistors && the supply voltage (as I'm sure LT Spice will). and, while of know of the existence of...

Indeed I have. And thank-you both for your input. I did realise that Bernard had pointed the way to be being able to calculate a series of virtual resistors & hence combine these to get an equivalent resistance for the network. I was starting to think about how then to work back calculating the...

I know this is a little outside the scope of this forum, but I also know that some of the members here have an electronics/maths background. I'm trying to understand how to analyse the resistor network below (this is not a homework problem - I'm way to old for that! It is a real world/project...

I too an skeptical about "inductive" coupling to earth. Unlike capacitive coupling, how can inductive coupling lead to a current imbalance? I think the original OP is getting confused about leakage flux which in not the same thing at all. Another possible explanation: Circuits with multiple...

I'm not quite sure what you are asking :) But to answer the question I think you are asking..... have you found the GridWatch site ? https://gridwatch.templar.co.uk/ This details the UK consumption & generation. Currently the UK loading is around 34 GW of which around 28% is coming from Wind...

What code would you give them? And why?

Then, with the usual proviso of making sure the fitting is switched off before you replace the lamps etc etc, I'd say go for it!

BS4343 plugs/sockets are unfused. If your scenario were so, nothing would prevent the taking of all 40A through a single 16A plug ..............

Are these traditional filament lamps (ie. they get hot) or LED lamps. I'd be carefully of using the adapters with a traditional lamp, maybe too hot but Id have no concerns with an LED lamp.

I have the same recollection. I think it was something like "several BS4343 sockets could be supplied from a radial circuit not exceeding 20A". I'm trying to find the reg number..............