The standard requires a system-level EMC test plan. Even if each component has its own certificate, the assembled ship must be verified.
The official repository where you can purchase and download the current edition and consolidated versions. iec 60533 pdf
For in IEC 60533, IEC 60945 serves as the basic EMC standard . This means that equipment in these groups must meet IEC 60945's more stringent requirements. The standard requires a system-level EMC test plan
It provides the blueprint for early-stage EMC planning, preventing costly retrofits caused by interference discovered during sea trials. For Classification Societies: iec 60533 pdf