1. OCAU Merchandise now available! Check out our 20th Anniversary Mugs, Classic Logo Shirts and much more! Discussion here.
    Dismiss Notice

What curve are cb/rcds in aus?

Discussion in 'Electronics & Electrics' started by xc351, Dec 5, 2019.

  1. xc351

    xc351 Member

    Joined:
    Dec 30, 2005
    Messages:
    2,623
    Just wondering what trip curve a standard combo rcd/cb 30mA
    Cheerd
     
  2. XR6DAn

    XR6DAn Member

    Joined:
    Aug 22, 2007
    Messages:
    215
    Location:
    Sinnamon Park
    C curve.
     
  3. Fred Nurk

    Fred Nurk Member

    Joined:
    Apr 5, 2002
    Messages:
    2,228
    Location:
    Cairns QLD
    In the absence of anything else I'd have assumed they're a C curve.
     
  4. HSV_Enigma

    HSV_Enigma Member

    Joined:
    Jul 21, 2003
    Messages:
    483
    Location:
    Adelaide
    Aren't you supposedly a sparky? Sounds like you need to read your rulebook again.
     
    ArmoureD, 3Toed, Privatteer and 2 others like this.
  5. OP
    OP
    xc351

    xc351 Member

    Joined:
    Dec 30, 2005
    Messages:
    2,623
    Yep I'm a lecky. But do sfa domestic work I'm more happy to play with 275kv than 240stuff. Plus I've never cared before want want a quicker tripping one without down sizing my rcd.
     
  6. Fred Nurk

    Fred Nurk Member

    Joined:
    Apr 5, 2002
    Messages:
    2,228
    Location:
    Cairns QLD
    If that's the case get a B curve MCB and put one of those RCD modules on the side. Will cost you more and you'll lose a pole space though...
     
  7. HSV_Enigma

    HSV_Enigma Member

    Joined:
    Jul 21, 2003
    Messages:
    483
    Location:
    Adelaide
    That's what the rulebook is there for, for reference to the rules, and circuit breaker knowledge is hardly confined to the realms of domestic.
     
  8. ArmoureD

    ArmoureD Member

    Joined:
    Sep 12, 2002
    Messages:
    725
    Location:
    Earth
    The thermal characteristics of all thermal/magnetic MCBs are essentally the same. Its just the magnetic part that differs. So having a B or a C curve will not necessarily mean it'll trip quicker if your only overloading it slightly...

    Why do you need a B curve RCD?
     
  9. Symon

    Symon Castigat ridendo mores

    Joined:
    Apr 17, 2002
    Messages:
    4,700
    Location:
    Brisbane QLD
    If you need fast acting protection then get a fast acting fuse or similar.

    Exactly. The curves are the same, just the magnetic function is further to the right of the curve with C and D curves, so more of the overload function is available to be used.
     
    ArmoureD likes this.

Share This Page

Advertisement: