Forms of Internal Separation

 

Low-voltage switchgear assemblies can be divided by means of partitions or barriers into separate compartments or enclosed protected spaces. The aim of forming separate compartments or enclosed protected spaces, which contain the functional units is to:

- Protect against direct contact with hazardous parts belonging to the functional unit
- Limitat possibilitities of arc fault occurrence.
- Protect against the passage of solid foreign bodies from one functional unit into the adjacent unit.

Typical forms of internal separation are differentiated depending on how the compartment or subsection is constructed:

 

Form 1
- No internal separation

 

Form 2b
- Separation of busbars from the functional units.
- The terminals for external conductors
do not need to be separated from the
busbars

 
 

Form 4b
- Internal separation between busbars and
functional units as well as functional units
among one another, including the
terminals for external conductors which
are an integral part of the functional unit.

- Terminals for external conductors which
are not an integral part of the functional
unit, which however are in an individual,
separate, enclosed protected space or compartment.