Posting a message to the forum will remove the above advertisement
  1. angel While you're here, would you mind checking out our Electrician's Insurance section to see if we could save you a few quid? - Specifically our Van Insurance Deals and Public Liability Insurance Deals. Thanks for supporting the forum! angel

Discuss 16mm tails with 100A fuse ??? in the Electrical Forum area at ElectrciansForums.co.uk.

Please make sure you checkout our forum sponsors, many do discounts for members and, they keep the forum free to use.
  1. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Job today to change out old fusebox and I'd noted the 16mm tails but on pulling the fuse this morning it was 100A which I wasn't expecting. Fairly recent new smart meter installed by XYZ who are also the DNO ... Shouldn't the fuse be limited to 60A in this case? Thoughts and advice appreciated :)
     
  2. westward10
    Offline

    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Could you not change them to 25.0
     
  3. Ian1981
    Offline

    Ian1981 Electrician's Arms

    Location:
    North east
    As it's existing are you expecting that your total demand is going to be higher than the rated CCC of the tails ?
    16mm tails are good for 87amps clipped direct
     
    • Agree Agree x 1
  4. westward10
    Offline

    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    What are they rated at once you enclose them in CU as they are no longer clipped direct and should be derated.
     
    • Dislike Dislike x 2
  5. Ian1981
    Offline

    Ian1981 Electrician's Arms

    Location:
    North east
    WEve had this argument before.
    Then by definition nothing can be classed as clipped direct as it ultimately terminates into an enclosure
     
    • Agree Agree x 9
  6. westward10
    Offline

    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Between meters and service terminal blocks they are, as soon as you contain them they are no longer clipped direct throughout and that rating will not apply.
     
    • Disagree Disagree x 1
  7. Ian1981
    Offline

    Ian1981 Electrician's Arms

    Location:
    North east
    Rubbish!
     
    • Agree Agree x 6
  8. westward10
    Offline

    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Is it, justify clipped direct when it is partially contained.
     
  9. Rpa07
    Offline

    Rpa07 2000 posts - only 46379 behind Telectrix! Electrician's Arms

    Location:
    Bristol
    Business Name:
    Ebenezer electrical
    Do you really think that Westy, really or is there some pedantry going on- you've brought it up in the past?
     
  10. Ian1981
    Offline

    Ian1981 Electrician's Arms

    Location:
    North east
    Its all about how the cable is installed and it's ability to dissipate heat.
    Sorry but that's just another post meant quite frankly to annoy people
     
    • Agree Agree x 7
  11. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    Back on track - how difficult would it be to change the tails?

    What do you estimate the maximum load to be for the property? If its well under 87 amps you could reasonably leave the 16mm in place ....

    tin hat is on!
     
    • Like Like x 2
  12. westward10
    Offline

    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    Quite the opposite it is a reasoned argument using as you say, how the cable is installed and it's ability to dissipate heat whereby this ability is lowered once contained.
     
  13. Des 56
    Offline

    Des 56 Trusted Advisor

    Location:
    Gliese 581C
    If a cable passed directly through a insulation packed 4x2 stud partition so that those few inches were all that was not clipped direct,how many of you would de rate the cable?
    Getting rid of that heat is what the ccc are all about as Ian mentioned previously
     
  14. Rpa07
    Offline

    Rpa07 2000 posts - only 46379 behind Telectrix! Electrician's Arms

    Location:
    Bristol
    Business Name:
    Ebenezer electrical
    Maybe we shouldn't be IP rating the CUs then - let the wind flow free! Or fit a permanently running CPU fan!
     
    • Like Like x 2
    • Funny Funny x 1
  15. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Well, I did try to move the tails but only got the 20cm I needed for the new CU and they won't budge any more, although there is slack at the meter. So changing the tails will be mission messy. Tails leave the external chest high meterbox in a cavity brick wall, go up and over the front door and drop down from the ceiling. CU mounted high up next to ceiling behind front door. New CU is in the location of the original fuse unit, at Customer's request. But somewhere in that lot the tails go through a beam I reckon and are jamming up. Nothing I can't sort if I rip into the plaster ceiling she's just had done :( .

    In terms of load, I am sure a 60A fuse would be fine. 2BR mid terrace, newish combi for CH and HW. Biggest drain will be an induction hob she's got on order.

    There's no insulation anywhere near the tails that I can see looking from both ends. The tails will be less than 3m long.
     
Loading...
Similar Threads - 16mm tails 100A Forum Date
Would you get the megger 1731 or 1711.... see below for details. Electrical Forum Today at 4:57 PM
Two pairs of tails from meter to two DB's - what do I record in Section L? Periodic Inspection Reporting & Certification Jan 12, 2018

Share This Page

Users found this page by searching for:

  1. 16mm swa on a 100a bs1361

Electricians Directory Post a Domestic Job Post a Commercial Job