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Question about electric rewiring

Discussion in 'Electrics UK' started by john2k, 6 Jul 2021.

  1. john2k

    john2k

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    A friend of mine's property has the old fuse wire type consumer unit. Part of building refurbishment to upgrade ceiling lights etc a company is quoting for complete re-wiring to change consumer unit. My question is, with an old system like that is a complete re-wiring needed? Does old wiring eventually need to be replaced?
     
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  3. flameport

    flameport

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    Wiring will all need replacing eventually, but it depends on how old, what type and whether it's still practical to use. Many older properties only had a single socket in each room, and even if the wiring was perfect, that's simply nowhere near enough for a modern home.

    The presence of a fuse wire fusebox doesn't automatically mean that rewiring is required - they were still being installed in the 1980s and even early 1990s, and wiring of that age is very likely still usable.
     
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  4. john2k

    john2k

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    Thanks for that.

    So just out of curiousity a new build this day and age that has new wiring, eventually at some point will the wiring need changing on that too?
     
  5. JohnW2

    JohnW2

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    As far as the actual wiring is concerned, probably not in your lifetime. For obvious reasons, no-one yet knows for certain, but PVC wiring is likely to last for at least 100 years, quite probably more. A re-wire might be undertaken before that for other reasons ('requirements' evolve over time, and if they change enough, a 're-wire' may be the simplest solution), but not because there was any problem with the actual wiring, per se.

    Kind Regards, John
     
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  6. john2k

    john2k

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    Thanks for the replies. For my friends property, just out of curiousity a small 3 or 4 bed house in London how much should a complete rewire with new consumer unit typically cost London price?
     
  7. bsr

    bsr

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    £5k as a very rough guide.
     
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  9. JohnW2

    JohnW2

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    BAS's answer always used to be "about the same as a second-hand car", and your suggestion is not inconsistent with that.

    Kind Regards, John
     
  10. ericmark

    ericmark

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    The mineral insulated wiring of the 1920's is likely still OK today, but the rubber is well past it's use by date, PVC has had problems, the plasticizer can leach out making it brittle, but this is rare, also if over loaded it can be damaged, but in the main PVC cable lasts a long time.

    My granddads house wired 1920's had two 15 amp sockets one in hall and one on landing, iron plugged into the lights, dads house 7 sockets, one in each room and on landing, that was 1954, by 1978 when my first house built, still only 4 circuits, sockets, lights, immersion and cooker, but many more sockets, think there were 6 in the kitchen alone, by 1985 when this house built two lighting and two sockets supplies, lights split up/down, sockets side to side.

    The introduction of 30 mA RCD's resulted in sockets also split up/down so that the lights and sockets for each room are not on the same RCD, idea is should you get a shock from socket supply you will not be plunged into darkness, but the distribution board has also changed, the so called high integrity so some circuits on RCBO's so sockets again split side to side, which means if there is a problem don't need extension leads up/down stairs, more even loading, and less wire used so better loop impedance.

    There are other factors, like cables being run in the cavity wall, then insulation added, so each premises has to be assessed, my dad's house was rewired, but some items were left, the kitchen had been rewired before the full re-wire, and the wet room was also new, so those area were not done. But the rewire resulted in loss of supply to loft except for lights, and reduced supply to garage, and some walls with no sockets due to being papered and hard to redecorate after.

    I did not re-wire it myself, main reason was speed, costing £600 a week accommodation for mother while being rewired, so speed was important. At one point there were 6 electricians in the house, I think the guy under estimated how long it would take, seem to remember £3000 and in North Wales and as said some bits not done, detached 3 bedroom house.

    But pricing is hard, the different firms suggested different levels of re-wiring, some included LAN cables and TV, some included making good, the one I used did not include making good, however they were good in considering the work needed to make good after. So yes same as cost of second hand car, as so many variables. Council houses were re-wired all surface near where I live, and each house took two days, all done the same, and if tenant had changed things they were charged to correct them, for example if they had fitted a chandelier, it was removed, dumped, and tenants charged.

    Today rules don't allow trunking where it could fall off in a fire, and so surface wired re-wires have gone up in price, plus metal consumer unit, and so often it can't be fitted in old location, dads house consumer unit under the stairs, I don't think it should have been fitted there, but was not my decision, it was put where old one was, which was silly as mother could not access it in wheel chair. This all reflects on the price.
     
  11. Risteard

    Risteard

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    I'd suggest that's an underestimate. They're dearer than that even in rural parts of Ireland.
     
  12. winston1

    winston1

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    When I visited Ireland everything seemed more expensive than the UK with the exception of diesel fuel.
     
    Last edited: 8 Jul 2021
  13. Risteard

    Risteard

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    Yes, well that's true of course. But - and not forgetting we're talking about London here also - I still think it's a gross underestimate. It might be possible as a price, but certainly not likely.

    I recently priced a 3 bed in Donegal at around €8k + VAT, and recently completed a 4 bed in Donegal at €10k + VAT.
     
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