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mains

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  1. timhoward

    Anderson connector for 230v supply?

    I thought I took a photo earlier but seemingly not. Someone's fitted a joint box to move a consumer unit. It's a refreshingly neat job. Din rail, wagos DIN connectors for final circuits etc. It's even fully labelled up. One thing is a first for me. Inside the enclosure, an Anderson 2 pin plug...
  2. pirate

    Info please on a mains powered smoke alarm

    Not come across this before, so would like some help, please. I went to install smokes and heat alarm (to new Scottish regs) in a fairly modern flat last week. The flat is on the top floor of three. Noted that the flat had one smoke in the hall. Assessed minimum requirement as smoke in hall...
  3. Midwest

    H07RN-F FLEX MAINS suitability

    At work in our main kitchen, the 6kW (26A sp) water packed up. The restaurant staff were in turmoil, as they had no hot water to make the tea. Luckily we had a new spare one lying around. The old one was fed by a 32A supply, 4mm 6242B (LSOH) cable 32A RCBO. From the rotary isolator, the...
  4. D

    Sub mains supply wiring

    We currently have a property being split into 2 No. flats. The local electricity board have put the 2 No. meters and consumer isolators external at ground floor level within a housing. My question is can we run the upstairs flat sub mains supply (SWA) through the ground floor flat to the first...
  5. S

    Back up generator to mains?

    What is the best way to do a back up generator installation? I have a guy who wants a 3KW generator (only to power some lights and a pump) but never done one of these installs before, I'm assuming commando socket outside wired to changeover switch?? Thanks
  6. 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
  7. 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...
  8. 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...
  9. 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):-...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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 /...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. B

    When swapping a mains powered smoke detector

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

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