Forms of Assemblies - FORM 4 (Part 4)

Note:
The above Form Code have been tabulated based on IEC 439-1, Part 1, Clause 7.7 - FORUM

Forms of Assemblies - FORM 3 (Part 3)

Note:
The above Form Code have been tabulated based on the IEC 439-1 Part1, Clause 7.7 - FORUM

Forms of Assemblies - FORM 1 & 2 (Part 2)

Note :

The above Form Code have been tabulated based on the IEC 439-Part 1, Clause 7.7 - FORUM

Forms of Assemblies (Part 1)

According to IEC 439-1, Clause 7.7 Forms of Assemblies can be obtained by means of partitions or barriers (metallic or non-metallic) into separate compartments or barriered sub-section.

Why is Forms of Assemblies is very important?

1. to enable a functional unit to remains in service - to reduce the risk of making accidential contact with the live part or adjacent units of busbars

2. to reduce the risk of loose part, tools, or even debris falling into or otherwise passing into an adjacent compartment

3. to limit the probability that ionised gas created by the operation of a short-circuit protective device, could cause flash over accross adjacent equipments or busbars

4. protection against contact with live parts belonging to the adjacent functional units

Note :

The above are a summarisation of Form Code IEC 439-Part 1, Clause 7.7 - FORUM