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What about a lockable isolator? Leave the meter box unlocked (openable with the utility key) so meter readers etc can get in, but lock the isolator in the ON position. Can also be locked in the off position if anyone is working and has it isolated.

By M Bus are you talking about Modbus? I work with industrial control systems and PLC controllers and networks. I have a small about of Modbus stuff on my sites so have an understanding. We also use profibus a fair amount.

Is having 3 switches not the best way forward for these devices. One for either socket as per normal, then a separate one for the PSU for the USB outlets. Like this i made in paint.

Not really DIY or domestic related this one; Whilst out on another site today, i found this strange set up in the corner of the room. What starts out looking like a DNO lead sheathed supply cable.... which comes from under ground, then terminates in an old (60s??) metal cutout...

Whilst out on a remote site today (siphon priming station) i noticed that the mains supply cut out has black stuff leaking out of the bottom. Obviously this isn't ideal, but is it worth reporting to the DNO? Also how does it work when its not a domestic property? I'll just report it to the...

DNO Cutout

You've just had me going crazy, thinking i was mad. I was sure i have seen those pictures before, and read an almost identical thread. Well i wasnt: http://www.diynot.com/diy/threads/what-would-you-do-with-these-switches.428126/

RS sell 3.6v ones. Mainly used as battery back up. Dont know what it would do to a torch, or how you would recharge. http://uk.rs-online.com/web/p/c-batteries/6684556/

Oh well i figured this might be the case. I was hoping we could use volt drop calcs to work backwards. I suppose would need the voltage at the other end of the cable to work out the drop. I'm sure there are no RCD's here. This circuit (going from the installation date written on the old flow...

I suppose i should have started with "i have a garage supplied with 4mm2 SWA but i dont know where its fed from". [/joke]

Hi, I wonder if it would be possible to calculate the approximate length of a cable from a few know values? I work at a water treatment plant as a controls and instrumentation engineer (not an electrician) and have a panel that i cant for the life of me find out where it is fed from. The...