This is the third edition of CSA C22.2 No. 129, Neutral supported cables, one of a series of Standards issued by the Canadian Standards Association under Part II of the Canadian Electrical Code. It supersedes the previous editions, published in 1976 and 1963 under the title Neutral Supported Cable.
This Standard specifies requirements for Type NS75 and NS90 neutral supported cables for use on outdoor overhead electrical systems that have nominal voltages of 600 V or less for installation in accordance with the Canadian Electrical Code, Part I.
Neutral supported cables covered by this Standard consist of up to five conductors (one, two, or three insulated phase conductors, a neutral conductor, and an optional insulated control/supply conductor). The conductors are insulated with polyethylene (PE) rated 75 °C or cross-linked polyethylene (XLPE) rated 75 or 90 °C.
Flame test requirements for neutral supported cable insulations or coverings are also included where called for by the Canadian Electrical Code, Part I.
In CSA Standards, 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; may is used to express an option or that which is permissible within the limits of the standard; and can is used to express possibility or capability. 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.