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Technical Resources

4. FORMS OF INTERNAL SEPARATION AS PER BS EN 61439-2

Form 1 Form 2 Form 3 Form 4
Separation of busbars from the Separation of busbars from the
functional units and separation functional units and separation of all
of all functional units from one functional units from one another,
Separation of busbars from the
No separation another. Separation of the including the terminals for external
functional units.
terminals for external conductors conductors from functional units,
from functional units, but not from which are an integral part of the
each other. functional unit.
Form 2a Form 3a Form 4a Type 1

Sub-criteria “a”: terminals for Sub-criteria “a”: terminals for Type 1: Busbar separation is achieved
external conductors not separated external conductors not separated by insulated covering, e.g. sleeving,
from busbars. from busbars. wrapping or coatings. Cables may be
glanded elsewhere.

Form 2b Type 1 Form 3b Type 1 Form 4a Type 2 & Type 3

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Sub-criteria “b”: terminals for Sub-criteria “b”: terminals for Type 2: Busbar separation is by
external conductors separated external conductors separated metallic or non-metallic rigid barriers
from busbars. from busbars. or partitions. Cables may be glanded
elsewhere.
Type 1: Busbar separation is Type 1: Busbar separation is Type 3: Busbar separation is by
achieved by insulated covering, achieved by insulated covering, metallic or non-metallic rigid barriers
e.g. sleeving, wrapping or coatings. e.g. sleeving, wrapping or coatings. or partitions. The termination for each
functional unit has its own integral
glanding facility.

Form 2b Type 2 Form 3b Type 2 Form 4b Type 4

Type 2: Busbar separation is by Type 2: Busbar separation is by Sub-criteria “b”: terminals for external
metallic or non-metallic rigid metallic or non-metallic rigid conductors not in the same
barriers or partitions. barriers or partitions. compartment as the associated
functional unit, but in individual,
separate, enclosed protected spaces
or compartments.
Type 4: Busbar separation is achieved
by insulated covering, e.g. sleeving,
wrapping or coatings. Cables may be
glanded elsewhere.

All information shall be treated as guidance only. ELSTEEL does not take any responsibility.
Always check with the latest edition of BS EN 61439 or equivalent.

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