Isolator switch pole number??

Discussion in 'Homework Help' started by Cerkit, Mar 20, 2012.

  1. Cerkit

    Thread Starter Active Member

    Jan 4, 2009
    275
    3
    Hi. This is probably more of a question to do with disambiguation. When talking about isolator switches and specifying for example 2pole or 4pole for a 3phase Isolator switch what does this mean?

    For the 2pole example does it mean that each phase has 2 contactors for each phase ie A-A B-B C-C and that when turn the switch you disconnect each connection?? If so what is the 4 pole switch?

    Many thanks!!
     
  2. amilton542

    Active Member

    Nov 13, 2010
    494
    64
    I'm confused by your terminology disambiguation? Do you mean discrimination?

    A 2-pole isolator will isolate a single-phase supply inside a domestic consumer unit.

    A 4-pole isolator will isolate all three phases and neautral by which is generally abbreviated to a TP&N isolator.
     
  3. Cerkit

    Thread Starter Active Member

    Jan 4, 2009
    275
    3
    Ok. What about for an MCB, if it is a three phase 2 pole MCB what does that mean. What would it mean if it were a 3 three phase 4 pole MCB??
     
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