CEI-23-50 Foglio di normalizzazione C11 (ex CEI UNEL 47169-68) Calibro per il controllo dell’allargamento minimo e della tenuta dell’alveolo di terra delle spine S31

CEI 23-50 C11 Gauge for Controlling S31 Plug Earth Socket Minimum Expansion and Retention is developed in accordance with CEI 23-50 Normalization Sheet C11, and it is specifically engineered to inspect two critical performance indicators of S31 plugs: the minimum expansion of their earth sockets and the retention capacity of those sockets. As a specialized and high-precision testing instrument, it helps ensure that the earth connection structure of S31 plugs meets relevant safety and quality standards, preventing potential electrical safety risks caused by the failure of the earth socket to maintain proper clamping force or meet dimensional requirements. It is an essential tool for manufacturers and testing organizations involved in the production and quality verification of household and similar electrical plugs.

Specifications
• Complies with CEI 23-50 Normalization Sheet C11 standard requirements
• Features a key dimensional parameter of ø4.6±0.05 mm for the testing part
• Has a specified overall mass of 400 grams, which is critical for the retention performance test
• Is manufactured with strict dimensional tolerances to ensure accurate and consistent test results
• Is dedicated to the detection of the earth socket’s minimum expansion and retention of S31 plugs

Test Procedures
• Prepare the gauge and the to-be-tested S31 plugs, making sure both are clean, free of deformation or damage that could interfere with test accuracy.
• For the minimum expansion test of the earth socket: Insert the corresponding testing end of the gauge into the earth socket of the S31 plug, ensuring that the insertion process does not require excessive force.
• For the retention performance test: After inserting the gauge into the earth socket, let the gauge hang freely relying on its own 400g weight, and check whether the gauge will fall out of the earth socket under the action of gravity.
• Record the test phenomena and results for each S31 plug, and judge whether the plug’s earth socket meets the standard requirements based on the insertion smoothness and retention status.
• After completing all tests, clean the gauge’s testing parts and store it in a dry, dust-free environment to preserve its testing precision for subsequent use.

Applications
• Batch quality inspection of S31 plugs in the production line of electrical plug manufacturers, conducting sampling or full inspection of finished products to ensure the qualification rate of earth socket performance.
• Compliance certification testing of S31 plugs by third-party electrical product testing and certification institutions, to verify that the products meet the relevant Italian safety standards.
• R&D and optimization stage of S31 plug products, using the gauge to verify the rationality of the earth socket’s structural design and material selection, and adjusting parameters according to test results to improve product performance.
• Daily supervision and spot-check work of market regulatory authorities on household plug products, using the gauge to identify unqualified S31 plugs with substandard earth socket expansion or retention performance.

CEI-23-50 Foglio di normalizzazione C11 (ex CEI UNEL 47169-68) Calibro per il controllo dell’allargamento minimo e della tenuta dell’alveolo di terra delle spine S31