LT Panels
LT Panels FORM 1
No internal Separation or no separation of busbars from the functional units:
LT Panels FORM 2
Separation of busbars from the functional units:
Protection against contact with live parts upstream from outgoing devices.
Limitation of risk of propagation of short-circuit currents between functional units and busbars (electric arcs or solid bodies).
TWO TYPES OF FORM 2 SEPARATIONS AS SPECIFIED BY I.S. EN 60439-1
FORM 2A:
Terminals for external conductors not separated from the busbars. Functional units are separated from the busbars, but not the terminals for external conductors.
FORM 2B:
Terminals for external conductors separated from the busbars. Functional units and terminals for external are separated from the busbars.
LT Panels FORM 3
Separation of busbars from the functional units and separation of all functional units from one another.
Separation of the terminals for external conductors from the functional units but not from one another.
– Protection against contact with live parts.
– Limitation of the risk of faults between each of the functional units ( propagation of electrical arcs, etc.)
TWO TYPES OF A FORM 3 SEPARATION AS SPECIFIED BY I.S. EN 60439-1
FORM 3A:
Terminals for external conductors not separated from the busbars. The functional units are separated from one another and from the busbars, but the terminals for external conductors are not.
FORM 3B:
Terminals for external conductors separated from the busbars. The functional units are separated from one another and from the busbars. The terminals for external conductors are separated from the functional units but not from one another.
LT Panels FORM 4
Separation of busbars from the functional units and separation of all functional units from one another, including the terminals fro external conductors which are an integral part of the functional unit.
Protection against contact with live parts and limitations of the faults between each of the functional units ( propagation of electrical arcs, etc.)
TWO TYPES OF FORM 4 SEPARATION AS SPECIFIED BY I.S. EN 60439-1
FORM 4A:
Terminals for external conductors in the same compartment as the associated functional unit.
FORM 4B:
Terminals for external conductors not in the same compartment as the associated functional unit, but in protected spaces or separate closed compartments.
