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Publications C22.3 NO. 7-15

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C22.3 NO. 7-15 - Underground systems

Publication Year:

  • 2015

Total Pages:



  • CSA

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C22.3 No.7 Underground Systems

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The Canadian Electrical Code is published in several parts, with Part III standards covering electrical protection, safety, and design criteria related to both overhead and underground systems for distribution and transmission. ‘Underground Systems’ refers to the lines and equipment associated with underground electrical supply and communications systems located entirely outside buildings and fenced supply stations. The fifth edition of CSA C22.3 No. 7 Underground Systems is one of a series of standards issued under the Canadian Electrical Code, Part III.

Highlights of C22.3 No.7

  • Updated reference publications, revised definitions and restructured clauses
  • Removal of backfill compaction values and layering requirements
  • Updated requirements for bonding of supply and communication cable shields/sheaths
  • Addition of new clauses including depth below grade of grounding conductors, separation between grounding conductors and gas lines, and marking for supply cables installed at a reduced depth of burial
  • Addition of material to Annex A dealing with line of sight intersections and supply cable bonding techniques

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GST REG No R119441681
QST REG No R1006017360