CSA C68.5:20

Preface:

This is the third edition of CSA C68.5, Primary shielded and concentric neutral cable for distribution utilities. It supersedes the previous editions published in 2013 and 2007.

The first edition of CSA C68.5 adapted the requirements of the following documents:
a) ANSI/ICEA S-94-649;
b) ANSI/ICEA S-97-682;
c) CEA Purchasing Specification WCWG-01 (95), XLPE Primary Cable up to #4/0 AWG; and
d) CEA Purchasing Specification WCWG-02 (95), XLPE Primary Feeder Cable.

The main revisions incorporated in the third edition of CSA C68.5 include the following:

• Clarification on the four classifications of ethylene propylene rubber insulation and applicable requirements;
• Removal of thermally strippable insulation shield;
• Addition of "WBS" for blocked strand or "WBC" blocked cable for constructions incorporating water- blocking component;
• Removal of the word "optional" for Thermomechanical qualification test to clarify that this test is mandatory on jacketed cables.

This Standard is arranged to allow for selection of the individual components, such as conductors, insulation type and thickness, metallic shield or concentric neutral, and jackets, that are required for a specific installation and service conditions. Clauses 4to 9specify the materials, material characteristics, dimensions, and tests applicable to the major components of cables and, if applicable, to the design concept.

Funding in support of the consensus process of this Standard was provided by the following funders, whose assistance is acknowledged with thanks: Canadian Electricity Association (CEA), S&C Electric Canada Ltd., Fortis BC, Fortis Alberta, Maritime Electric, Newfoundland Hydro, Newfoundland Power, Schneider Electric Canada Inc., and IFD Corporation.

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
The requirements of this Standard apply to materials, constructions, and testing of tree-retardant cross- linked polyethylene and ethylene propylene rubber-insulated single conductor or triplexed primary shielded and concentric neutral power cables rated 15 to 46 kV that are used for the transmission and distribution of electrical energy.

The products covered by this Standard are suitable for direct burial or installation in ducts in both wet and dry locations and where the cable will be exposed to sunlight.

1.2
This Standard specifies the requirements for shielded and concentric neutral cable intended primarily for operation by electric utilities.
Note: The operation of cables complying with this Standard by other than an electric utility can be subject to additional requirements by the electrical inspection authority having jurisdiction.

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; "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.

1.4
The values given in SI units are the units of record for the purposes of this Standard. Where values are given in parentheses they are for information and comparison only.