EN IEC 60721-3-2 Part 3-2: Classification and Intensities of Environmental Parameter Groups - Transport and Handling

The “EN IEC 60721-3-2 Classification of environmental conditions - Part 3-2: Classification and severity of environmental parameter groups - Transport and handling” standard, which is based on a European standard and subsequently published by the International Electrotechnical Commission (IEC), classifies the groups of environmental parameters and their severity to which a product is exposed during transport and handling. The most commonly used transport and handling methods are taken into consideration. These include:

• Road transport: cars, trucks
• Rail transport: trains, trams
• Water transport, inland water and sea transport: ships
• Air transport: airplane, jet, propeller, helicopter
• Handling equipment: cranes, hoists, cable cars, personnel.
• conveyors
• Wheelbarrows.

The environmental conditions specified in this standard are the conditions to which the product may be exposed during transport and handling. If the product is packaged, the environmental conditions apply to the packaging containing the product. If the product is unpackaged, the environmental conditions apply to the product. Storage conditions are specified in the EN IEC 60721-3-1 standard.

In the world of engineering and product design, ensuring equipment can withstand the challenges of transportation and storage is critical. Harsh vibrations on a cargo ship, extreme temperatures in a warehouse, or humidity during air transport can compromise functionality if not taken into account. This is where EN IEC 60721-3-2 comes in. This standard is a key international standard that provides a systematic framework for classifying environmental conditions during the transportation and storage phases of equipment's lifecycle.

The EN IEC 60721-3-2 standard is part of the broader IEC 60721 series of standards that addresses the classification of environmental parameters and their severity. This standard focuses on the natural environments encountered during transport and storage, excluding operational use. It helps manufacturers, designers, and testers define reliability requirements, select appropriate packaging, and conduct verification tests.

The aim of the EN IEC 60721-3-2 standard is to classify environmental conditions according to their severity, enabling stakeholders to determine the conditions under which products must withstand degradation. This standard applies to a wide range of equipment, including:

• Electrical and electronic devices
• Mechanical systems
• Devices and components

However, this standard does not cover operational environments (IEC 60721-3-3 standard for stationary use or IEC 60721-3-4 standard for vehicles) or artificially controlled conditions such as climate-controlled storage.

The primary objectives are as follows:

• To provide a common language for environmental specifications in contracts and standards.
• To guide the selection of test methods (generally referring to the IEC 60068 series of standards for environmental tests).
• Optimizing costs and performance by minimizing over- or under-design.

The EN IEC 60721-3-2 standard divides the conditions into several parameters, each with defined classes (e.g., 2K1 to 2K12 for climate conditions). The basic environmental parameters covered are:

• Climate conditions (K):
• Temperature, humidity, air pressure, and precipitation.
• Classes range from mild (e.g., 2K1: controlled indoor storage) to extreme (e.g., 2K12: unprotected outdoor in polar regions).
• For example, temperatures as low as -65 degrees in 2K11, and high humidity up to 100 percent in tropical classes.
• Biological conditions (B):
• The presence of flora, fauna, mold, or rodents.
• The classifications range from 2B1 (minor) to 2B3 (severe, e.g., areas infested with insects).
• Chemically active substances (C):
• Pollutants such as salt, sulfur dioxide, or chlorine.
• The classifications range from 2C1 (low, rural areas) to 2C3 (high, industrial or coastal).
• Mechanically active substances (S):
• Sand, dust, or settled particles.
• The grades range from 2S1 (low dust) to 2S4 (high abrasive sand).
• Mechanical conditions (M):
• Vibration, shock, and free fall.
• The classes range from 2M1 (gentle handling) to 2M3 (rigid sea transport with shocks up to 1000 m/s²).
• Specific climatic conditions:
• Additional factors include solar radiation, icing, or vegetation growth.

Classes are represented by a combination such as 2K4/2B2/2C2/2S2/2M2, representing a moderate transportation scenario worldwide. For example,

• 2K4: Climatic. Worldwide, partially protected. Minus 25 degrees to plus 55 degrees, low air pressure.
• 2B1: Biological. No significant factors. Clean storage.
• 2C2: Chemical. Average pollution. Sea salt maximum 300 mg/m2/day.
• 2S2: Sand/dust. Sedimentary dust. Maximum 0,2 mm particles.
• 2M2: Mechanical. Normal transport. Vibration 1-35 Hz, 5 m/s², shock 300 m/s².

For example, for laptops shipped worldwide:

• Class: 2K3 (temperature -40 degrees to +70 degrees, short-term exposure), 2M3 (harsh use).
• Tests: Drop from 1 meter (IEC 60068-2-31 standard), vibration on a rocking table.

The advantages of the EN IEC 60721-3-2 standard are as follows:

• Standardization: Ensures interoperability and clear supplier communication.
• Risk reduction: Prevents failures such as corrosion from moisture or cracks caused by impacts.
• Cost efficiency: It avoids over-engineering for unexpected scenarios.

The limitations of this standard are as follows:

• The classes are generalized; real-world endpoints may exceed them (supported by field data).
• It does not cover electromagnetic or radioactive environments.
• Choosing the right classes correctly requires expertise.

In conclusion, the EN IEC 60721-3-2 standard is an indispensable tool for anyone involved in product development, logistics, or quality assurance. By managing and classifying the invisible threats of transportation and storage, it enables engineers to develop robust products that can navigate the journey from factory to end-user. Compliance with this standard ensures that equipment is not only functional and ready for use, but also durable.

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services compliant with the EN IEC 60721-3-2 standard.