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Discuss Maximum Zs values for BS3871 in the Electrical Courses & Electrical NVQ's area at ElectrciansForums.co.uk.

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  1. gazdkw82
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    gazdkw82 Trainee Trainee Access

    Location:
    leicester
    Where can I find the max Z's value for a BS3871, type 3, 32A MCB?

    Iv had a look through BS7671 and done some searching online but I cannot find it. IV found some tables with listed Zs values for a 3871 but I have no idea where they originate from or how old
     
  2. Vortigern
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    Vortigern Regular EF Member

    Location:
    England
    Business Name:
    F.H. Electrical
    This is from the Unite guide, a great little pocket book. Much the same as OSG except it is £7. IMG_4521.JPG
     
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  3. spinlondon
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    spinlondon Forum Mentor

    Location:
    Harlow Essex
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  4. gazdkw82
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    gazdkw82 Trainee Trainee Access

    Location:
    leicester
    Those 2 references contradict each other? The unite guide says it's 0.719 and the other chart says 0.58??
     
  5. spinlondon
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    spinlondon Forum Mentor

    Location:
    Harlow Essex
    The one I posted a link to, shows the 80% values.
     
  6. Taylortwocities
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    Taylortwocities Electrician's Arms

    Location:
    Oxfordshire
    My guess is that the NICEIC figures include the 80% rule of thumb malarky.

    0.719 x 80% = 0.57
     
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  7. Taylortwocities
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    Taylortwocities Electrician's Arms

    Location:
    Oxfordshire
    Snap!
     
  8. gazdkw82
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    gazdkw82 Trainee Trainee Access

    Location:
    leicester
    Ah... Lovely.

    Thankyou :)
     
  9. Strima
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    Strima Electrician's Arms

    Location:
    St Neots
    Don't forget to adjust for Cmin... (0.95)
     
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  10. Vortigern
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    Vortigern Regular EF Member

    Location:
    England
    Business Name:
    F.H. Electrical
    And bear in mind they are adjusted values for 230v instead of 240v.
     
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  11. gazdkw82
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    gazdkw82 Trainee Trainee Access

    Location:
    leicester
    It's just for a minor works cert so no need for Cmin
     
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  12. Strima
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    Strima Electrician's Arms

    Location:
    St Neots
    Why not?
     
  13. westward10
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    westward10 In echoed steps I walk across an empty dream. Staff Member Moderator

    Location:
    Northamptonshire
    Type 3 was on the same Table as a type C.
     
  14. gazdkw82
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    gazdkw82 Trainee Trainee Access

    Location:
    leicester
    It's not required. It asks for the max Zs values listed in BS7671.
     
  15. westward10
    Online

    westward10 In echoed steps I walk across an empty dream. Staff Member Moderator

    Location:
    Northamptonshire
    You would need to look in a 16th Ed to find them as I said they were the same Table as a type C.
     
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