This part of ISO 8283 establishes a classification and designation system for sockets and specifies the design formulae and the derived dimensions, together with tolerances, of these sockets and of spigots for joints of acrylonitrile/butadiene/styrene (ABS) fittings and for integral sockets of ABS pipes intended for use in discharge systems inside buildings where such joints are intended to accommodate expansion and contraction in the discharge system.