IEC TR 60721-4-6:2001

• Abstract:

  IEC TR 60721-4-6:2001 Deals with the correlation and transformation of the conditions given in IEC 60721-3-6 to the environmental tests defined in IEC 60068-2. An environment may consist of a number of environmental conditions such as dynamic, climatic and biological and other effects due to chemically and mechanically active substances. In this report, only dynamic and climatic conditions have been considered. The purpose of this technical report is to provide the specification writer with guidance together with a set of easy-to-use tables which correlate and transform these conditions.

• Status: Published
• Publication Date: 14-Aug-2003
• ICS: 19.040 - Environmental testing
• Technical Committee: TC 104 - Environmental conditions, classification and methods of test
• Drafting Committee: MT 19 - TC 104/MT 19
• Current Stage: PPUB - Publication issued
• Start Date: 30-Mar-2001
• Completion Date: 31-May-2001

• Amended By: IEC TR 60721-4-6:2001/AMD1:2003 - Amendment 1 - Classification of environmental conditions - Part 4-6: Guidance for the correlation and transformation of environmental condition classes of IEC 60721-3 to the environmental tests of IEC 60068 - Ship environment
• Effective Date: 05-Sep-2023

Overview

IEC TR 60721-4-6:2001 offers detailed guidance on correlating and transforming environmental condition classes defined in IEC 60721-3 to the environmental testing methods specified in IEC 60068, with a particular focus on ship environments. This technical report addresses the practical needs of specification writers by providing clear instructions and user-friendly tables for converting between these international standards.

Understanding and classifying environmental conditions is crucial in designing and testing electrical and electronic equipment for maritime applications. IEC TR 60721-4-6 emphasizes two primary environmental conditions relevant to ships: dynamic and climatic. These are vital factors influencing the performance, safety, and longevity of equipment subjected to harsh marine settings.

Key Topics

• Correlation of Environmental Classes
  The report establishes a framework to translate IEC 60721-3 environmental condition classes into corresponding IEC 60068 test procedures, ensuring coherent and consistent environmental testing.

• Climatic Conditions
  These include temperature, humidity, salinity, and other weather-related factors that affect shipboard electrical equipment. The standard provides guidance on appropriate climatic tests reflecting actual maritime scenarios.

• Dynamic Conditions
  Dynamic conditions cover mechanical stresses such as vibration, shock, and acceleration encountered on ships. The report maps these to relevant standardized test methods.

• Recommended Test Durations and Severities
  The document specifies the durations for test exposures and severity levels suitable for simulating shipboard environments under IEC 60068 protocols, supporting reliable and repeatable testing.

• Tables for Easy Reference
  Multiple tables categorize and recommend specific environmental tests for various IEC 60721-3 classes (e.g., 6K1, 6M2), aiding technical experts in selecting appropriate test conditions.

Applications

• Maritime Electrical and Electronic Systems
  Equipment designers and qualification engineers use this report to design robust systems that withstand harsh shipboard conditions, ensuring compliance with international standards.

• Environmental Test Planning
  Manufacturers and testing laboratories apply the correlation guidelines to develop relevant test plans aligned with IEC 60068, facilitating clearer communication and acceptance of test results.

• Safety and Reliability Engineering
  By aligning tests with realistic ship environmental scenarios, this guidance supports enhanced equipment reliability, operational safety, and lifecycle durability in maritime applications.

• Standard Harmonization
  This report assists regulators and certification bodies by providing a common basis to reconcile classification schemes and test methodologies, streamlining certification processes for equipment intended for marine use.

Related Standards

• IEC 60721-3 – Classification of environmental conditions - Part 3: Environmental parameters and their severities
  Defines environmental classes and parameters relevant to equipment use environments, including ship atmospheres.

• IEC 60068-2 Series – Environmental testing procedures
  Specifies procedures for environmental tests such as temperature variation, humidity, vibration, and shock relevant to electrical and electronic equipment.

• ISO 8846 – Electrical devices for boats - Protection against ignition of surrounding flammable gases
  Addresses special safety requirements for electrical equipment in ship environments complementing environmental testing standards.

• IEC 60945 – Maritime navigation and radio communication equipment and systems - General requirements
  Establishes performance and testing requirements for shipboard electronic communications and navigation systems.

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By leveraging IEC TR 60721-4-6:2001, engineers and manufacturers ensure that shipboard equipment is robustly designed and thoroughly tested against realistic environmental factors, thereby enhancing maritime safety, operational success, and compliance with global electrotechnical standards.