max Zs for BS3871 type B mcb

Discussion in 'Electricians' Talk' started by steve CF, Jun 15, 2005.

  1. steve CF

    steve CF New Member

    anyone know or where to find the max Zs for a BS3871 type B mcb
  2. steve CF

    steve CF New Member

  3. Just looked in my old yellow reg book , Type 1 miniture circuit breakers to BS 3871 .Its max Zs is 2 for a 30a for 0.4sec dis time reg 413-02-11 and 5sec dis time for reg 313-02-12/14
  4. Meant reg 413-02-12/14. In the yellow book !
  5. mskelec

    mskelec New Member

    It won't be type B it will be type 2 - letters are used with 60898's. A type 2 breaker is exactly the same as a B type, so a 30A will be 1.60 (100% value).
  6. mskelec

    mskelec New Member

    I'm an idiot - it's 3's and C's which are equal. A type 2 30A is 0.91 (80% value).
  7. steve CF

    steve CF New Member

    thanks for the replys

    i thought it was strange been a type B

    it was a retro fit wylex

    i had to look twice but it was defiantly stamped type b 30a on the case
  8. mskelec

    mskelec New Member

    I was about to ask if it was one of those nasty Wylex things. It's definitely a type 2, and besides those values are the safer of the two.
  9. mkelec, where did you find that, Type 1 is 2. Type 2 is 1.14
  10. sparky Si-Fi

    sparky Si-Fi Well-Known Member

    Table 2D of brown OSG gives values of Max Zs for BS 3871-1 or BS EN 60898 Steve

    page 92

    SF
  11. mskelec

    mskelec New Member

    slip, notice where I put '80%' in brackets...?

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