164 / 356
B-26
Distribution
Definition of Form 2
Separation of busbars from the functional units:
protection against contact with live parts upstream of the outgoing circuits
protection against penetration of foreign solid bodies.
The two types of Form 2 separation as defined by IEC 60439-1
b
b
DD381678
DD381679
Form 2a.
Form 2b.
Form 2a
Terminals for external conductors not separated from busbars.
The functional units are separated from the busbars, but not the terminals.
Form 2b
Terminals for external conductors separated from busbars.
The functional units and the terminals are separated from the busbars.
b
b
b
Form 2 configuration
Separation of busbars from the functional units
Form 2 partitioning is essential to ensure excellent protection for the installation and
operators working in the switchboard.
When added to standard protection features (terminal shields, prefabricated
connections, etc.), it eliminates the risk of direct contacts with live parts.
Prisma Plus offers Form 2b.
Form 2b provides much better safety than Form 2a, notably during connection,
because the terminals are separated from the busbars.
PD390420
DD383717
Form 2b partitioning.
Form 2 partitioning
Main distribution