Following criteria according to CEI 61439-2
Divide assemblies in separate compartments or confined spaces.
Protection against direct contacts with adjacent functional units. Protection degree IPXXB
Protection against the passage of solid bodies from one functional unit to another adjacent unit. Protection degree IP2X
The sectional separation form is agreed betwwen a switchboard manufacturer and its customer.
The form choice depends on :
Usage conditions
Maintenance periodicity
Requirements and conditions of future extensions
Service continuity criteriia
TABULA answers to your needs up to form 4b and IS 3.3.3 (french standard).