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Installing double socket in wall powered by plug

Discussion in 'Electrics UK' started by Alcedema, 2 May 2021.

  1. Alcedema

    Alcedema

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    Hi, we are desperately low on plug sockets and have an option of adding a new double socket in an existing hole, but chasing the new spur is out of the question (we rent). The wall is hollow and leads into an open space so are able to use the other end of the cable. Would it be legally ok (we have an electrical inspection soon) to wire the double socket using 3183Y 1mm cable but run that to a 13A plug which we plug into a plug socket further down? So really more of a permanent extension lead?

    IMG20210204185114~2.jpg IMG20210205201550~2.jpg

    Thanks!
     
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  3. 333rocky333

    333rocky333

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    1mm is rated at 10 amp i think, 1.5 is more suitable
     
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  4. Alcedema

    Alcedema

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    Thanks, I'll swap that out.. would you say the whole concept is technically sound though?
     
  5. JohnW2

    JohnW2

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    Also, although it is more than a bit silly, 1.0mm² cable is only 'allowed' (by regs) for 'lighting circuits', with 1.5mm² being the smallest 'allowed' for 'power circuits' (whatever they may be!)

    Kind Regards, John
     
  6. AndyPRK

    AndyPRK

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    This isn’t in the fixed installation though
     
  7. JohnW2

    JohnW2

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    It's always a bit difficult deciding what constitutes the 'fixed installation', particularly when the OP has described it as a "a permanent extension lead".

    As an indication of the 'grey area', although admittedly nothing directly to do with BS7671 (although it does say that, to comply with part P, work should comply with BS7671), Approved Document P includes ...

    Having said all that, it hadn't sunk into my brain that we were talking about flexible cable - which, ironically, can (per BS7671) apparently be as small as 0.75mm² (if adequate for the current) in a 'power circuit', even though the minimum CSA for a non-flexible cable would be 1.5mm² :)

    Kind Regards, John
     
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  8. Alcedema

    Alcedema

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    Brilliant, thanks! I will still replace the 1mm flex with 1.5mm flex.
     
  9. SUNRAY

    SUNRAY

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    Or 1.25mm² which is normally adequately rated to 13A
     
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  11. SUNRAY

    SUNRAY

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    What do you mean by lower down?
     
  12. winston1

    winston1

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    Can you put a reg to that? Whenever I have mentioned it I have been asked to prove it.
     
  13. CBW

    CBW

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    From whom do you rent? I know the landlord I work for wouldn’t accept it.
     
  14. sparkwright

    sparkwright

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    Would that include a fixed central heating supply, which may consist of 0.75 or 1.0mm2 flexes, and 1.0mm2 3 core and earth cables?
     
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  15. JohnW2

    JohnW2

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    Table 52.3, referenced in 524.1.

    However, as I subsequently clarified above, what I wrote only applies to cables which are not 'flexible', since that same Table indicates that the minimum CSA of flexible cables is 0.75mm² "for any other application" (hence including 'lighting' and 'power' circuits, whatever they may be).
     
  16. JohnW2

    JohnW2

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    I'm not sure what the question is - but the 'answers' are all in Table 52.3 for all to see.

    I think we can probably agree that everything about wiring in BS7671 only relates to 'fixed' wiring. Table 52.3 indicates that if a cable is not flexible, then the minimum CSAs are 1.0 mm² for 'lighting' circuits and 1.5 mm² for 'power circuits' (neither of which it defines, although the latest edition of regs does mention that 'lighting' circuits may supply "small items of current-using equipment, such as a bathroom extractor fan").

    However, as I said, if the cable is flexible, then the Table appears to indicate that the minimum CSA is 0.75 mm² for essentially any/all circuits (including 'lighting' and 'power' ones).

    As always, I presume that it is not meant to make sense :)

    Kind Regards, John
     
  17. winston1

    winston1

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    Thanks.
     
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