1.1   This International Standard is applicable to the product family of escalators and moving walks used in residential buildings, offices, hospitals, hotels, industrial plants, etc. This International Standard covers those aspects that need to be addressed when programmable electronic systems are used to carry out electric safety functions for escalators and moving walks (PESSRAE). This International Standard is applicable for escalator and moving walk safety functions that are identified in escalator and moving walk codes, standards, or laws that reference this International Standard for PESSRAE application. The safety integrity levels (SILs) specified in this International Standard are understood to be valid for PESSRAE application in the context of the referenced escalator and moving walk codes, standards, and laws in Annex B.