DIN EN 60068-2-2 / VDE 0468-2-2

• Describes tests under dry heat for various test specimens

• Applicable to energized and de-energized, packaged and unpackaged test specimens

• Objective: Determination of functional impairments or performance reductions

• Test is performed under the assumption of temperature equilibrium

• Does not include direct fire or explosion-related effects

• Includes test methods for high and low air velocity in the test chamber

• Defines requirements for measuring points around, on and inside the test specimen

• Contains nomogram methods for correcting the stress temperature

• Defines temperature limit deviations and test report requirements

Content, scope and tests:

The standard VDE 0468-2-2:2008-05, also published by DIN as DIN EN 60068-2-2, describes test methods for the investigation of environmental influences, in particular test B: Dry heat. This standard is part of a comprehensive series of test methods for electrotechnical products and is widely used in various industrial sectors.

The scope of the standard covers a wide range of test specimens, regardless of whether they are energized or de-energized, packaged or unpackaged. Test specimens that emit heat themselves are also taken into account. The main aim of the test is to determine whether the function is impaired or whether there is a significant reduction in performance under the given temperature conditions. Electrical, mechanical and other physical changes are considered.

The tests are carried out under the assumption that a temperature equilibrium is reached during the test procedure. It is important to note that the standard does not directly address effects directly related to fire or explosion, as these fall within the remit of other technical committees.

The standard defines various methods for carrying out the tests. A distinction is made between tests with high and low air velocity in the test chamber. The standard provides clear instructions for determining these air velocities. It also specifies requirements for the placement of measuring points around the test specimen, on its surface or inside it.

An important aspect of the standard is the nomogram method for correcting the stress temperature in high air velocity tests (test Bd and test Be). This method enables the test conditions to be precisely adapted to the specific properties of the test specimen.

The standard also specifies limit deviations for the temperature during the test3. These tolerances are crucial for the reproducibility and comparability of the test results. In addition, detailed requirements are placed on the documentation of the test in the form of a test report.

For the evaluation of the tests, the standard provides guidelines on how the results are to be interpreted. Particular attention is paid to the identification of functional impairments or reductions in performance. The documentation of the tests must contain all relevant information, including the exact test conditions, the measurement technology used and the observed effects on the test specimen.

Alternative standards with similar content and scope:

1. DIN EN IEC 60068-2-1 (VDE 0468-2-1): Environmental influences - Part 2-1: Test methods - Test A: Cold

2. DIN EN IEC 60068-2-30: environmental influences - part 2-30: test method - test db: damp heat, cyclic

3. DIN EN IEC 60068-2-14: Environmental influences - Part 2-14: Test method - Test N: Temperature cycling

4. DIN EN IEC 60068-2-78: environmental influences - part 2-78: test method - test cab: Moist heat, constant

5. ISO 16750-4: Road vehicles - Environmental conditions and tests for electrical and electronic equipment - Part 4: Climatic stresses