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The complete title of the norm is Specification for thermoplastics covers and frames for manholes and inspection chambers used in non-traffic areas. Issue date: 1. December 2012. The norm is in English.
The constraint "non-traffic areas" is also the crucial difference to the general European Standard for manhole covers EN124, which is only for vehicular access areas.
Plastic-manhole covers according to ISO 15398 are designated for the commitment on control- and inspection chambers in pedestrian (class A 15) and light vehicular areas (max. class B 125).
Moreover only manhole covers made of thermoplastics and with a maximum of DN 600 are regulated.
The pressure-/load proofs of the EN 124:1994 are the foundation of the proofs of suitability, which the ISO 15398 pretends. Additional to this you have to render comprehensive material specific proofs - e.g. impact resistance, cold-climate-crack-test, UV-resistance of the introduced plastics. Also safety features like surface condition, skid resistance and the accuracy of fit are defined.