Understanding Forms of Segregation

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Form 3b?  Form 4aih?  Ever wondered what your consultant is referring to when they talk about forms of segregation and don’t want to look stupid?

As defined by AS3439 they are methods by which the busbars and functional units of an Assembly can be internally separated. The standard outlines 4 main categories:

  • Form 1
  • Form 2
  • Form 3
  • Form 4

And you guessed it – the higher the number the higher the complexity.

A few definitions:

Assembly: a switchboard containing low-voltage switchgear/control gear.

Functional unit: a collection of electrical and mechanical components within an Assembly that contribute to the fulfilment of the same function. E.g. an individual motor starter within an MCC.

Busbar: Low impedance conductor to which several electric circuits can be separately connected.