This British Standard specifies requirements for plastics inspection chambers for use at depths to invert not exceeding 6 m in the construction of drainage and sewerage systems.
It is applicable to non-man-entry chambers with or without raising pieces and having a nominal cross-section as recommended in Table NB.2 of BS EN 752-3:1997, as amended in 2000.
The chambers are classified into four grades as a function of stiffness (see 7.6) and strength (see 7.7), to suit different depths of installation and location for exposure to surface loading (see Annex H). Attention is drawn to BS EN 124:1994 and BS 4660 which specify requirements for covers and frames for drainage purposes that are applicable to inspection chambers.
This standard specifies materials, dimensions and tolerances, physical and performance characteristics and marking for plastics inspection chambers for drains and sewers.