Preface
This is the third edition of CSA Standard C68.2, Concentric Neutral Power Cable. It is one of a series of CSA Standards on insulated power cable and is written in SI (metric) units. The others in the series are
C68.l, Paper-Insulated Power Cable Solid Type;
C68.3, Power Cable With Thermoset Insulation; and
C68.4, Portable Power Cables.
This Standard reflects current technology employed in the production and testing of concentric neutral power cables. It includes
(a) compact stranded conductors;
(b) extruded conductor shields;
(c) shielded insulation systems up to 46 kV, with a 100% insulation level, and
(d) full-reel, partial- discharge, extinction- level testing.
Scope
1.1
This Standard applies to two-conductor electrical distribution cables consisting of a thermoset insulated conductor and a copper concentric neutral conductor applied helically over the insulation shield with or without an overall jacket. The cables are intended for underground installation on either single—phase or three-phase distribution systems. Provision is made for a triplex assembly of cables. This Standard does not apply to cables intended for use in submarine applications.
1. 2
This Standard applies only to power cables for use on systems of 5 to 46 kV where the concentric neutral conductor is grounded.
1.3
The-insulation thicknesses covered in this Standard are based on the 100% insulation, level-grounded, neutral system.
1.4
This Standard applies to power cables capable of continuous operation at a maximum conductor temperature of 90°C. (See Appendix C.)
1.5
This Standard refers to the following and where such reference is made it shall be considered to refer to the latest edition and revision thereto, unless otherwise specified.
