Standard Process For Mechanical Strength Testing Of Neutral Blocks

The standardized process for mechanical strength testing of neutral blocks should revolve around the core testing items, combined with standard requirements and equipment operation, to ensure that the testing results are scientific and reliable. The specific process is as follows:

1、 Preparation before testing

Sample confirmation: Clearly specify the neutral block model, rated current (1A-200A), rated voltage (250V-1000V), wiring cross-sectional area (0.2mm ² -35mm ²) and other parameters to ensure that the sample meets the testing specifications.

Equipment calibration: When using equipment such as tensile testing machines, torque meters, impact testing machines, etc., it is necessary to calibrate and verify the accuracy in advance to avoid data deviation.

Environmental control: Set the testing environment temperature to 20 ± 5 ℃ and relative humidity to 45% -75% to ensure that environmental factors do not affect the results.

2、 Execution of core testing projects

Tensile testing: Fix the neutral block to the tensile machine, apply axial tension at a speed of 10mm/min, and record the maximum bearing capacity and fracture position. For example, 2.5mm ² wire neutral blocks must withstand a tensile force of ≥ 100N (UL 486E standard).

Torque test: For bolted neutral blocks, apply a specified torque (such as 3.5 tons ± 0.2 tons) to test the connection firmness and prevent damage caused by insufficient or excessive tightening.

Impact testing: Apply energy (such as 5J) using an impact testing machine to simulate a drop or collision scenario, and observe whether the neutral blocks are broken, loose, or solder joints are detached.

Vibration test: vibrate within the frequency range of 5-500Hz for 2 hours, retest the pull-out force attenuation rate ≤ 10%, to ensure fatigue resistance performance.

3、 Data Processing and Reporting

Data recording: Record key data such as tension curve, torque value, and impact energy in the form of charts.

Result analysis: Compare industry standards such as GB/T 13140 and IEC 60512-16-4 to evaluate whether the neutral blocks meet the standards. If the pulling force is less than 80% of the standard value, it is judged as failure.

Report generation: includes sample information, testing standards, conditions, data, and analysis reviews to provide a basis for product improvement.