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 walls and/or ceiling. They may be installed flush or semi-flush, surface mounted,
suspended or spaced away from the surface using fixing devices.