mains

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  1. J

    Fitting sockets in loft

    Afternoon:) Could anyone tell me the best way to get socket mains into the loft , would it be taking the ring main from the bedroom below? Thanks
  2. D

    3 Phase power keeps on tripping

    Hi Guys any advice on this one will be a major help. Was called out to a loss of power turned up expecting a breaker down as usual but not the case. so here goes the problem- an apartment block with 315 amp incoming fuses feeding 400 amp mccb set to trip at 220. This in turn feeds a rising...
  3. C

    Fire cable (pf200) used for mains.

    Hi all, this is just a question to put my mind at rest and to see if I'm right. I'm not a qualified spark and I'm not the person(s) involved with the work.... OK here we go! My workplace (large Plc) are having the staff toilets done up a bit. A hand dryer was removed from the wall and chase...
  4. C

    UK Load in Amps on a mains single-phase circuit

    I have a 230 Volt single-phase circuit with a 100 Amp cutout fuse and a 100 Amp MCB switch, so the supply is rated at 23 kVA. Only about 13% of my total energy consumption is electricity. The remaining 87% is natural gas, supplying the following appliances (kW figures are net output power):-...
  5. F

    Have I got 2 x mains switches?

    What have I got in there? Is that white (100amp) unit next to the large black original mains switch another mains on/of switch i.e. have I got two switches doing the same job? Note: We had a 2 room extension built about 20 years back and the Wylex CU box (in the pic) in the meter cupboard in...
  6. S

    mains switched contactor/relay in a box

    Hi I am helping with some village lights and need some advice as to a route forward (our electrician is unavailable for an undefined period) We currently have 7 lights strings, each is fed from a 13A socket via a mechanical timer that sits between the plug and the socket. Each timer needs to...
  7. M

    Mains interlinked smoke detectors

    Hi. My property is 25 years old. It has the original Fire Angel mains interlinked smoke detectors. One on the ground floor passage and one directly above on the first floor hallway ceiling. They have become unreliable - one going off no longer sets the other off. I have replaced Duracell 9v...
  8. Sparkgap

    Mains lamps at low voltages

    We recently had a single phase HV failure at our local substation with the result that the phase feeding our house dropped to about 88V. Interestingly, when I checked around the house a number of lights still worked: 60W filament GLS (red glow), some 7W LED lamps (nothing), other 7W LED lamps...
  9. G

    UK Dicon 670 MB mains interconnected battery back up SD's

    Hi Do these SD's need a key to enable removing them from their bases? I have two to change and trying to turn anti clockwise is screwing up the ceiling decs and artex...... There is an inverted T section that leads me to think they might need a key inserted there. If not, it might be brute...
  10. togglenation

    New Mains Powered smoke alarm beta testers needed.

    Hi all, I'm working in a company that makes battery smoke alarms, we're now one of the biggest intrusion alarm manufacturers in the EU region. We're developing our own Mains Powered Smoke / Heat / Co detectors and I would like to talk to proffesionl electricians who installs AICO / FireAngel /...
  11. F

    9v Battery Backup in line with mains adaptor?

    Hi everyone, I have a Toro garden water controller. It is a 9volt system operated by two PP3 batteries. With age the very thin wires on the battery connection have broken. It is in a shed so I have changed the batteries for a 240/9v adaptor. Works great and saves a lot in replacement batteries...
  12. P

    Mains cable surge impedance

    A short while back @marconi asked for the surge impedance of some 25mm SWA, so here are some related measurement results. For those who don't recognise the term, "surge impedance" is the same as "characteristic impedance" as in the 50 ohm cox cable you see advertised. It can best be explained...
  13. E

    New kitchen does it need own fusebox or change just the mains fusebox?

    New kitchen will be installed. Do we need to rewire the kitchen? The fusebox we have is ancient and our electrician has recommended to rewire kitchen then have a consumer unit just for the kitchen electrics as he said things may trip because our consumer unit is old but my builder who covers all...
  14. V

    Next door neighbour mains spurred, pre-meter off my main fuse!

    Semi-detached next door house mains supplied from my property pre-meter off main fuse. I cannot get a smart meter as main fuse cannot be pulled by non DNO electrician. This arrangement has been confirmed as not a revenue dodge (ie running feed to garden shed, extension etc). We confirmed the...
  15. B

    When swapping a mains powered smoke detector

    Only the head in this case. Is certification required? (Social Housing)
  16. M

    Regulations for Mains Wiring

    Hi, I’m hoping someone can signpost me to any regulations that exist for installation of mains wiring cable in a domestic setting. An electrician has installed a mains cable within 30mm of wall surface in almost the centre of a wall and I’m wondering if there are regulations against this...
  17. S

    UK Sub mains for garage help?

    So looking for some help, currently I have a sub mains board in the garage supplied from the house CU on a B16 mcb. Right now the sub mains in the garage has a 63amp main switch with 32amp radial circuit and a 10 amp lighting circuit although as there is going to be a shower added in to here...
  18. P

    Detecting loss of mains power remotely

    A friend of mine has solar panels & inverter and rents out the property. However, the RCD feeding it trips occasionally for no obvious reason (could be local supply disturbances, etc). Those renting it won't bother checking the RCD so is there any simple/cheap device that will periodically say...
  19. nbwriter

    Buzzing Mains Socket

    hi guys, i'm working on "kitchen rescue" after watching gordon ramsey's "kitchen nightmares" (season 2, episode 5)... where a fairly young owner turns round a failing restaurant (that hadn't been cleaned since she bought it 5 years ago) ? since we're in plague times and my kitchen was become...
  20. S

    Problem with the mains in my workshop

    Hi. I've just started renovating my workshop. It's about 30 years old, the walls on the inside have been doubled up with 15mm plasterboard. My plan is to cover the walls with 6mm hardwood ply because I got the sheets for free. I've just started screwing them to the walls. The original...

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