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Home / Technical Articles / Form of separation 2 – Requirements

Form 2

Form 2 defines overall assemblies which are enclosed to provide protection against contact with any internal live parts or components, and where there is internal separation of the busbars from functional units.

The following general conditions apply;

  • Busbars are separated from functional units
  • Functional units are not separated from other functional units.

Compliance with the requirements of Form 2 may be offered by EIEMA manufacturers by any of the three methods. Specifiers and Users should clearly state their preference.

FORM 2 (Form 2a)

Basic form as above. However, with this method terminals are not separated from the busbars, or each other. The actual means of separation is not defined in the Standard.

FORM 2 separation (Form 2a)
FORM 2 separation (Form 2a)

FORM 2 Type 1 (Form 2b Type 1)

Main criteria as FORM 2. Busbar separation is achieved by insulated coverings, e.g. PVC sleeving, wrapping or coating. Terminals are therefore separated from the busbars, but not from functional units or each other.

FORM 2 Type 1 (Form 2b Type 1)
FORM 2 Type 1 (Form 2b Type 1)

FORM 2 Type 2 (Form 2b Type 2)

Main criteria as FORM 2. Busbar separation is achieved by metallic or non-metallic rigid barriers or partitions. Terminals are therefore separated from the busbars, but not from functional units or each other.

FORM 2 Type 2 (Form 2b Type 2)
FORM 2 Type 2 (Form 2b Type 2)

Key throughout:

Forms of separation - key throughout


SOURCE: GUIDE TO FORMS OF SEPARATION – Low Voltage Switchgear and Controlgear Assemblies: BS EN 60439-1: 1994 (IEC 439-1)

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Edvard Csanyi

Electrical engineer, programmer and founder of EEP. Highly specialized for design of LV/MV switchgears and LV high power busbar trunking (<6300A) in power substations, commercial buildings and industry facilities. Professional in AutoCAD programming.

2 Comments


  1. Absar
    Jul 02, 2019

    Can we achieve form 2a separation if we use insulated wires in place of busbars? I wanted to share photo of an electrical panel to discuss if it complies with form 2a requirements.


  2. Mohamed Omar Morad
    Mar 28, 2016

    Dear Sir
    Good morning.
    I hope that you facilitate the process for downloading of your documents. It is like a puzzle.
    Thanks
    M. Omar Morad

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