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Discuss sqaure d breakers in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. irn-brue
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    irn-brue Regular EF Member

    Is a type 3 sqaure d braker equivelent to a type c breaker been to house was asked to fit mcb c32 to protect an oven and hob at roughly 6kw without diversty i know its not the norm to fit type c breakers for fixed restive loads i know they are used for comercial purposes where there is a high start up current. reluctent to fit type c breaker because it trips at Type C trips between 5 and 10 times full load current.
     
  2. i=p/u
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    i=p/u Trusted Advisor

    Long as within zs digits , fit a d type . I would say 3 is a type D??
     
  3. irn-brue
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    irn-brue Regular EF Member

    yeah was thinking that my self but d type not within zs calcs and wouldnt be happy putting d type in domestic as would take way to long to trip if fault were to occur.
     
  4. irn-brue
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    irn-brue Regular EF Member

    does any body know what type 3 sqaure d mcb is. is it type b or c would be more inclined to fit type but if rest of board is type c then would fit that.
     
  5. i=p/u
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    i=p/u Trusted Advisor

    You don't sound fluent, but it all depends on zs what can be used.. Why not buy what's needed ???
     
  6. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

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    Location:
    cheshire/staffordshire
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    Telectrix
    type 3 is nearest equivalent to type D. as said, Zs will probably be too high to comply. . fit a type 2 (C).
     
  7. irn-brue
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    irn-brue Regular EF Member

    yes gonna fit type c as within zs calcs.
     
  8. Geoffsd
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    Geoffsd Guest

    Type 3 is 7 to 10 x In
    Type C is 5 to 10 x In

    You should fit a B unless C is actually required (which it isn't).
     
  9. darkwood
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    darkwood Super Moderator Staff Member Trusted Advisor

    Location:
    West Yorkshire
    Yes its a resistive load unlike a motor or inductive lighting there's little inrush - a type B should be adequate
     
  10. irn-brue
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    irn-brue Regular EF Member

    may have to fit this breaker as person moving in on wed and told them it would be ready dont see it as being dangerous they supplied breaker not the norm but i dont think it breaks any regs. tin hat on! take a few more days to source another sqaure d breaker not common now days.
     
  11. i=p/u
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    i=p/u Trusted Advisor

    What is your zs
     
  12. irn-brue
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    irn-brue Regular EF Member

    dont have tester at the moment shall be getting one tomorow i belive the max zs for type c mcb is 0.58 will have to test this tomorow and see and if results fail will just have to explain to customer that cant be fitted as if above this value wouldnt trip within the required times.
     
  13. i=p/u
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    i=p/u Trusted Advisor

    0.29 roughly for type 3, if you have to wait you have to wait..

    - - - Updated - - -

    Or buy a 2 way enclosure and mcb and some tails, probably cheaper..
     
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