Busbar trunking is often suspended from ceilings or mounted on walls. The standard requires:
The standard is the specific international regulation for busbar trunking systems (BTS) and their accessories . It replaced the older EN 60439-2 standard to align with the rest of the IEC 61439 series, which covers low-voltage switchgear and controlgear assemblies. Key Scope and Specifications iec 61439-6 pdf