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KNOWLEDGE BASE
Choosing the right steel cover
Although BS EN 124 does cover manhole tops manufactured from a variety of materials including steel it is argued that some test procedures are inappropriate for steel. The standard defines certain test loads and minimum permanent deflections that are impractical from an economic point of view and it is maintained are unnecessary in certain slow-moving traffic situations. In addition, steel fabrication is a highly flexible process allowing all sorts of non-standard sizes and designs that are not covered by BS EN 124.