1.1 This standard applies to the design, installation, operation, maintenance and testing of equipment whose role is to ensure emergency power supply: a) in buildings or facilities in the event of a failure of normal power, where emergency power is required in the National Building Code of Canada (NBCC); and b) essential power systems, where emergency generators are intended for use in health care facilities in accordance with section 6 of CSA Z32. Notes: 1) For guidelines regarding emergency power supply for survival equipment, see Appendix A. 2) In this standard, the term “building” also refers to facilities. 3) The normative provisions of this standard are not limited to installations where an emergency generator is used as the emergency electrical power source required by the NBCC for powering “equipment for the physical safety of people”. 4) For guidance on the use of emergency power supply equipment for purposes other than those covered by clause 1.1, see Annex D. 5) The scope of this standard provides the possibility that equipment other than “equipment for the physical safety of people” could be connected to the emergency generator (see article 6.4.1). 6) For electrical power systems designed and installed to be capable of serving purposes other than those specified in section 1.1, the electrical power system should meet the requirements of this standard, if practicable , and the guidelines in Annex E of this standard. 1.2 This standard does not cover: a) emergency power supplied by batteries or other uninterruptible power sources; and (b) the design and construction of self-contained emergency lighting devices conforming to CSA C22.2 No. 141. 1.3 In this standard, the term “shall” indicates a requirement, that is, a requirement that the user must respect to ensure compliance with the standard; “should” indicates a recommendation or what is advisable but not obligatory to do; and “may” indicates a possibility or what is permitted to be done. The notes that accompany the articles do not include prescriptions or recommendations. They are used to separate from the text explanations or information that are not properly part of the standard. Notes at the bottom of figures and tables are part of these and can be written as prescriptions. The annexes are qualified as normative (mandatory) or informative (optional) to clarify their application.