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B-61
Form 4 partitioning
Distribution
Main distribution
Separation of busbars from the functional units + separation of all functional units from
one another + terminals for external conductors
Presentation
Dd382369.eps
Dd382370.eps
Form
4a
4b
Security
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Form 4b : terminals for external conductors not in the
same compartment as the associated functional unit,
but in individual, separate, enclosed protected spaces
or compartments.
Form 4 partitioning is essential to ensure excellent
protection for the installation and operators working
in the switchboard.
>>
protection against contacts with live parts and
reduction in the risk of faults between the
functional units (propagation of electrical arcs,
etc.).
In addition to partitioning of themain busbars (Form
2) and installation of the horizontal partitions
between functional units (Form 3), the cubicle must
be equipped with:
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Form 4 gland plates to achieve Form 4a
>>
Form 4 covers for connection transfer assemblies
to achieve Form 4b.
DD384525.eps