IEC 60092-302-2:2025

Overview

IEC 60092-302-2:2025 is the International Electrotechnical Commission (IEC) standard that defines specific requirements for low-voltage marine power switchgear and controlgear assemblies (MPSC‑assemblies) used on ships. It applies to stationary enclosures with rated voltages up to 1 000 V AC or 1 500 V DC and covers assemblies for power generation, distribution, conversion and the control of electrical loads. This second edition (2025) updates the 2019 edition and introduces technical revisions aligned with the latest IEC 61439 series.

Key topics and requirements

• Scope and definitions: Clarifies terms such as main switchboard, emergency switchboard, motor control centre (MCC) and distribution board specific to marine use.
• Marine-specific safety factors: Additional safety margins (for example, on clearance and creepage distances) are required because of the high consequences of power loss at sea.
• Design and constructional requirements: Covers service conditions, enclosure design, interface characteristics, and constructional practices for shipboard switchgear.
• Performance and verification: Includes requirements for performance, design verification, routine verification and temperature-rise limits; short-circuit verification checklists are provided.
• Electromagnetic compatibility (EMC): Annex J addresses EMC considerations specific to ships with metallic hulls.
• Information and documentation: Specifies information to be supplied by manufacturers and items subject to agreement between manufacturer and user (Annex AAA).
• Manufacturing flexibility: Applies to one-off custom assemblies and standardized production, and allows manufacture/assembly by parties other than the original manufacturer.
• Exclusions: Does not apply to individual devices and self-contained components (e.g., motor starters, fuse switches, electronic devices) covered by their relevant product standards (such as IEC 60947).

Practical applications

IEC 60092-302-2:2025 is directly used to specify, design, test and procure shipboard low-voltage switchgear systems, including:

• Main and emergency switchboards on commercial and offshore vessels
• Motor control centres for propulsion or auxiliary systems
• Distribution boards feeding ship services and critical safety loads
• Panels associated with power conversion and distribution on ships and mobile offshore units

Who should use this standard

• Marine electrical engineers and ship designers
• Switchgear and controlgear manufacturers and assemblers
• Shipbuilders, shipowners and fleet managers
• Classification societies and surveyors
• Procurement and compliance teams specifying shipboard electrical systems

Related standards

• IEC 61439-1:2020 and IEC 61439-2:2020 (low-voltage switchgear and controlgear assemblies - general rules and power assemblies)
• IEC 60092 series (electrical installations in ships)
• IEC 60533 (EMC for shipboard installations)
• IEC 60947 series (individual switching devices)

Keywords: IEC 60092-302-2:2025, marine power, MPSC-assembly, low voltage switchgear, ships, clearance, creepage, IEC 61439, main switchboard, emergency switchboard, motor control centre.