The following are the
"assessment categories" for RCBs—
(a) assessment category 1, for an RCB—(i) of type B construction or type C construction; and(ii) with a rise of 2 or more storeys;
(b) assessment category 2, for an RCB—(i) of type A construction; or(ii) of type B construction or type C construction with a rise of 1 storey.