Clause 1 of IEC 61534-1:2011 and IEC 61534-1:2011/AMD1:2014 is applicable except as follows: 1.1 Addition: This part of IEC 61534 specifies the particular requirements and tests for PT systems intended for mounting on, or under the floor level and floor service units which are mounted on the floor, under the floor or flush with the floor. NOTE 1 Types and applications are shown in Figures AA.1a, AA.1b and AA.2 NOTE 2 Flushfloor PT systems, with the exception of flushfloor service units, are not covered by this standard.