Siemens SIVACON S4-ALPHA Maintenance Book page 9

Standards
Forms of internal separation (Tab. 104 CEI EN 61439-2)
Form Main criteria
Form 1 No internal separation
Form 2a Separation of busbars from all functional units
Form 2b
Form 3a – Separation of busbars from all functional units
– Separation of all functional units from one another
Form 3b
– S eparation of terminals for external conductors and the
external conductors from the functional units, but not from
the terminals of the functional units
Form 4a – Separation of busbars from all functional units
– Separation of all functional units from one another
– S eparation of terminals for external conductors associated
Form 4b
with a functional unit from the terminals of any other
functional unit and the busbars
– Separation of the external conductors from the busbars
– External conductors need not be separated from each other
Forma 3a
1
2 2
4
4 4
4
3
4
4
4
Form 3a
Forma 3b
1
2 2
4
4 4
4
3
4
4
4
Form 3b
Subcriteria
Terminals not separated from busbars
Terminals separated from busbars
Terminals not separated from busbars
Terminals for external conductors and external conductors
separated from busbars
Terminals in the same compartment as the associated
functional unit
Terminals not in the same compartment as the associated
functional unit
Forma 4a
1
2 2
4
4 4
4
3
4
4
4
Form 4a
Forma 4b
1
2 2
4
4 4
4
3
4
4
4
Form 4b
9
SIVACON S4 - ALPHA
ENG