Preface This is the fifth edition of CSA C22.2 No. 8, one of a series of Standards issued by CSA Group under Part II of the Canadian Electrical Code. It supersedes previous editions published in 1934, 1945, 1982, and 1986. The major changes incorporated in this new edition include a) modification of the scope to include dc filters and extend the filters up to 750 v; b) exemption of the flame test in Clause 6.13 for enclosures having a flammability rating of 5 VA; c) deletion of the 15 cm lead length limit in Clause 6.6.2 and replacing it with a reference to Table 1 of the Canadian Electrical Code Part I; and d) updating of the reference standards to latest editions. For general information on the Standards of the Canadian Electrical Code, Part II, see the preface of CSA C22.2 No. 0, General Requirements-Canadian Electrical Code, Part II. This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard. Scope 1.1 This Standard applies to filters intended for suppressing electromagnetic interference in, or with, apparatus and machines that are to be connected to an ac supply with nominal system voltages of up to 750V and a nominal frequency of up to 60 Hz or connected to a dc supply up to 1060 V dc, intended to be used in nonhazardous locations in accordance with the Canadian Electrical Code, (CEC) Part I. 1.2 General requirements applicable to this Standard are given in CSA C22.2 No. 0, General Requirements - Canadian Electrical Code, Part II. 1.3 In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.