Precast concrete products. Beam-and-block floor systems - Lightweight blocks for simple formwork1 Scope This European Standard deals with the requirements and the basic performance criteria for lightweight blocks used as formwork during the construction of the floor system. The blocks are used in conjunction with precast concrete beams in compliance with EN 150371, with or without cast in situ concrete for the construction of beam and block floor systems. This European Standard does not deal with blocks made in polystyrene, with or without tong,

but with the adoption of new electronic technologies

Problems related to voltage fluctuations fall into two basic categories:

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It should be noted that although BS 7404-1

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and approaches to evaluate them