CSA C22.2 NO. 291:24

Description

Preface This is the harmonized CSA Group and ULSE standard for Bare and Covered Ferrules. It is the third edition of CSA C22.2 No. 291 and the third edition of UL 486F. This edition of CSA C22.2 No. 291 supersedes the previous editions published in 2019 and 2014. This harmonized standard has been jointly revised on August 28, 2026. For this purpose, CSA Group and ULSE are issuing revision pages dated August 28, 2026. This harmonized standard was prepared by CSA Group and ULSE. The efforts and support of the Technical Harmonization Subcommittee, CANENA Technical Harmonization Committee 99 – Electrical Connectors of the Council on the Harmonization of Electrotechnical Standards of the Nations of the Americas (CANENA), are gratefully acknowledged. This standard is considered suitable for use for conformity assessment within the stated scope of the standard. This standard was reviewed by the CSA Integrated Committee on Electrical Connectors, under the jurisdiction of the CSA Technical Committee on Wiring Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the CSA Technical Committee. This standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. Scope 1.1 These requirements cover bare and covered ferrules intended for field wiring and factory wiring for use in accordance with the National Electrical Code, NFPA 70 and Canadian Electrical Code, Part I, CSA C22.1. 1.2 This standard applies to ferrules that are intended to facilitate the connection of stranded wire on to devices, such as terminal blocks. Their purpose is to treat stripped wire and prevent turned back strands during installation. They are intended to be used to attach to one stranded copper conductor or two stranded copper conductors of the same size. 1.3 When intended for use with one conductor, these ferrules are suitable for use with 777 kcmil – 26 AWG, 380 – 0.14 mm 2 , stranded copper conductors. For conductor sizes 8 AWG, 10 mm 2 or larger, these ferrules are suitable for use with stranded copper conductors that are more finely stranded than Class B or C conductors. NOTE: Examples of stranding classes more finely stranded than class B or C are classes G, H, I, K, M, 5, and 6. In addition, Type DLO cable is more finely stranded than Class B or C. 1.4 When intended for use with two conductors, these ferrules are suitable for use with (2) 6 – (2) 26 AWG, (2) 16 – (2) 0.25 mm 2 , stranded copper conductors. 1.5 This standard applies to ferrules that are intended to be terminated in wire connection devices rated for: a) Solid copper conductors; and/or b) Stranded copper Class B and C conductors – applicable to wire connection devices rated to terminate conductor sizes 8 AWG, 10 mm 2 or larger. 1.6 Ferrules covered by this standard are not intended for use in IDC (insulation displacement connection) terminal blocks. 1.7 This Standard applies to Ferrules rated for use with conductor sizes 2/0 AWG, 70 mm 2 or larger that are intended for use in aluminum and copper body mechanical connectors with dome and conical shaped screws that apply direct pressure to the conductor being terminated. 1.8 This standard does not apply to wire connectors such as pin adapters covered in CSA C22.2 No. 65 or UL 486A-486B. 1.9 Ferrules covered by this standard may be used with equipment having short circuit ratings of: a) 85,000 A maximum, or b) 100,000 A maximum if supplied by an overcurrent protective device, and the equipment short-circuit current rating, divided by the number of conductors per phase, results in a current of 50,000 A or less per conductor.