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Discuss Pyro meter tails, can they stay or need replacing? in the DIY Electrical Forum area at ElectrciansForums.co.uk.

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  1. glenn
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    glenn EF Member

    Location:
    nottingham uk
    Business Name:
    none
    hi all , im having a new consumer unit fitted ,but my meter tails are in pyro its a 1970's 2 bed terraced house.. im just waiting for my electrician to confirm if he can re use the pyro tails or they have to be replaced with something more modern.
    can anyone confirm yes or no have they got to go? the electrician tested them and said they are perfect .
    thanks glenn
     
  2. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    There's no need to replace them just because they are pyro.
     
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  3. Strima
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    Strima Electrician's Arms

    Location:
    St Neots
    If they've tested fine them leave them as they are.
     
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  4. glenn
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    glenn EF Member

    Location:
    nottingham uk
    Business Name:
    none
    hi dave thanks for replying, the pyro is i think 10mm is this ok , the main fuse is 60 amp. its obviously been in since the house was built ,i dont need anything upgrading and no need for any extras electric wise.
    thanks
     
  5. SparkyChick
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    SparkyChick Making a banana smoothy for my fave gorilla Electrician's Arms

    Location:
    South Wales
    Business Name:
    SparkyChick
    Learning opportunity question coming up...

    As I have no experience of pyro, is there anything that should be considered if you have to move it? For example, if the both ends are properly terminated but the one doesn't quite fit a knockout in a new enclosure? How far is it safe to tweak it before you have to be concerned about possible damage/internal faults?

    Likewise, if it's a major change of position?
     
  6. Des 56
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    Des 56 Trusted Advisor

    Location:
    Gliese 581C
    The cable itself has the cores insulated with compacted magnesium powder,they will take one mighty hammer blow to even damage that insulation
    If you bend the cable,do so with a sweep rather than try and do an instant 90 degrees (which will probably collapse the outer copper sheath),there is a tool for making the bends but using a bit of rounded wood will do
    The pots on the end are star crimped with a soft compound insulation,they do not like being disturbed,so any movement needed should be elsewhere other than the pot

    It is possible to remove the gland and pot and re use if you take care,however,the potting compound would need renewing,so best have some handy if you are ever going to dismantle,without the correct tools it would be difficult for a newbie to terminate,however,the stripping,potting and crimping can be done with hand tools if needs be
     
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  7. Strima
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    Strima Electrician's Arms

    Location:
    St Neots
    What Des says!!!

    I would IR it afterwards just to be certain the potting compound hasn't moved etc.
     
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  8. glenn
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    glenn EF Member

    Location:
    nottingham uk
    Business Name:
    none
    its just a straight swap on the consumer unit, hes happy to refit the pyro if its all ok to do so ..like i said it tested perfect, no moving involved .i just need to know if it can stay on the pyro be legal, meet all the regs needed and get certified?
     
  9. Des 56
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    Des 56 Trusted Advisor

    Location:
    Gliese 581C
    glenn
    Pyro is in many ways a superior cable to what is now used in many applications
    If it tested fine and is adequate for your current demand,then leave it and have confidence that its reputation over many years is not overstated
     
  10. Strima
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    Strima Electrician's Arms

    Location:
    St Neots
    Pyro complies with British standards so is fine to use. TBH if your house burnt down the Pyro would still be there and working as intended.

    It used to be in common use, I worked on a load of 50's built council flats in Cambridge a few years ago and it was all in good condition. A bit of brasso polished it up lovely...

    (please note, don't polish it...)
     
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  11. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    It's probably fine, but I couldn't say for certain without actually seeing the job.

    It's up to the electrician doing the job to make the decision
     
  12. glenn
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    glenn EF Member

    Location:
    nottingham uk
    Business Name:
    none
    i think hes waiting for a reply from napit?
     
  13. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    If it's got a sharp bend in it then it'll probably split if you try to re-work it.

    It's pretty bomb proof and can usually be moved without issue, though a bit of experience helps a lot to know how far is too far as work hardening can cause it to split.

    Also it can be annealed with a blow torch if necessary.
     
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  14. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    They are probably Googling Pyro as we speak.
     
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  15. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    They'll probably trot out a standard line telling him to replace with 25mm tails.
     
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  16. Richard Burns
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    Richard Burns Trusted Advisor

    Location:
    Cambridgeshire
    Business Name:
    Richard Burns
    Much better information than I could provide, but I did feel that it should be noted that it is magnesium oxide powder and not magnesium metal powder as the filler.:)
     
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  17. glenn
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    glenn EF Member

    Location:
    nottingham uk
    Business Name:
    none
    yeh im thinking that , but its a bit of a pig to do, the meter and box is sat on the out side wall ,which has just had external wall insulation fitted and cant be carved into with out making a mess of it .. and the only other way is back into the living room and through a wall to where the c/u is situated..
     
  18. glenn
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    glenn EF Member

    Location:
    nottingham uk
    Business Name:
    none
    yeh im thinking that , but its a bit of a pig to do, the meter and box is sat on the out side wall ,which has just had external wall insulation fitted and cant be carved into with out making a mess of it .. and the only other way is back into the living room and through a wall to where the c/u is situated..
     
  19. LeeH
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    LeeH Insert witty monkey comment here. Electrician's Arms

    Location:
    Lincs
    I asked at college how durable it was, and at the time we had a legend of a guy (Pete Brooks RIP) at HCUK doing practical training.

    Me - So Pete, how durable is this Pryor stuff.
    Pete - Hmm, very. Watch this!

    He proceeded to connect an Supply on one end and a lamp the other draped over an small anvil. He then proceeded to batter the **** out of it until it looked like a 2 pence peace....bang. The RCD went.

    Me - Coooool!

    Boring little story but one of my many memories as an apprentice.
     
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  20. Rpa07
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    Rpa07 2000 posts - only 46379 behind Telectrix! Electrician's Arms

    Location:
    Bristol
    Business Name:
    Ebenezer electrical
    What's boring about watching someone hit 10 bales out of energised pyro - dude you need to stay IN more!
     
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  21. westward10
    Online

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

    Location:
    Northamptonshire
    I member the exact same scenario at college except the cable wasn't live just connected to an insulation resistance tester.
     
  22. 7029 dave
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    7029 dave Trusted Advisor

    Location:
    bedfordshire
    Could you put up a photo of the said tails, would like to see.
     
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