Information on the most widely used ASTM standards within the materials testing industry
EN 50086-2-4: Specification for conduit systems for cable management. Particular requirements. Conduit systems buried underground
EN 50086-2-4 test method is applicable to the study of underground pipeline systems, including pipelines and pipeline accessories used in electrical installations or electronic communication systems for protecting and handling insulated wires and cables. it stipulated the compression test, falling weight impact test and bending test.
Test Method and test equipment required:
| Compression Test | Samples shall be (200± 5) mm long. The samples shall be compressed between two flat steel plates having minimum dimensions (100 x 200 x 15) mm, the length 200 mm being along the length of the sample. The samples shall be compressed at a rate of(15 +0,5) mm/min and the load recorded at the vertical deflection equivalent to 5 % of the average value of the original inside diameter of the sample. Method: Apply constant‑rate displacement compression along the conduit’s major axis until one of three termination criteria is met: Specimen fracture (force drop) Predefined force limit reached Predefined displacement limit reached Purpose: Evaluate resistance to soil pressure, backfill loads, and vehicle‑induced ground pressure. | Universal Testing Machine (UTM): Capable of controlled displacement‑rate compression. Hardened‑Steel Compression Platens: Parallel, flat anvils to apply uniform load.
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| Falling weight impact test | Mechanical impact test, which is a critical Type Test (a one-off test on a sample to validate design) for rigid conduits (both metallic and non-metallic) and their fittings. Its primary objective is to evaluate the conduit's ability to resist physical damage from external blows during installation and service life, thereby ensuring continued protection for the enclosed cables. The test simulates an external mechanical impact, such as from a falling tool or accidental kick. A defined impact energy is delivered to a specimen of conduit mounted on a rigid support using a standardized striker (hammer). The specimen is then inspected for permanent deformation, cracks, or other damage.
| Impact Testing Machine: Typically a pendulum hammer (like a Charpy hammer) or a guided falling-weight apparatus.
Striker (Hammer): The standard specifies a striker with a hemispherical steel face of radius (10 ± 0.1) mm. The mass of the hammer assembly is chosen to deliver the required impact energy. Specimen Support: A rigid steel block or frame that securely clamps the conduit specimen, simulating a fixed installation (e.g., on a wall). Measuring Apparatus: A depth gauge or calibrated mandrel to measure the residual deformation (indentation depth) and verify that the internal diameter has not been reduced beyond the permissible limit. |
| Bending test | The test is made on six samples having an appropriate length. Three samples are tested at room temperature, the other three are tested at(5+ 1) C. For the test at -5 C, the samples shall be conditioned in a cold chamber for 2 hours. The test apparatus consists of a device as shown below allowing to bend the conduit with a bending radius. One of the ends of the samples shall be fixed on the test apparatus by means of an appropriate device. The sample is then bent to approximately 90o and hold. During the test, the sample shall not flatten.
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