CAN/CSA C22.3 NO. 1-06 PDF

1.2 Existing installations, including maintenance replacements, additions, and alterations, meeting the original designs that currently comply with prior editions of this Standard, need not be modified to comply with this edition of the Standard, except as might be required for safety reasons by the authority having jurisdiction.

1.3 This Standard, which forms part of the Canadian Electrical Code, Part III, provides requirements for the construction of overhead systems. It covers electric supply and communication circuits that (a) are installed alone; (b) are in joint use; (c) are in proximity to each other or other facilities; (d) cross each other or other facilities; and (e) cross railways, highways, or land that is likely to be traversed by vehicles or pedestrians.

1.4 This Standard presents a choice between deterministic and reliability-based design methods. Reliability-based design methods are covered by CAN/CSA-C22.3 No. 60826.

1.5 The requirements contained in this Standard do not constitute complete design and construction specifications, but rather prescribe the minimum design requirements that are most important to the (a) safety of persons; (b) continuity of service; and (c) protection of property.

1.6 Conditions not covered by this Standard are governed by equivalent Standards in common use or by the authority having jurisdiction.

1.7 In some cases, specific types of construction are envisaged. This does not preclude the use of other types of construction, provided that the engineering representatives involved can demonstrate the safety and suitability of these alternatives.

1.8 The use of terms such as "where practicable" is not intended to provide an opportunity for not meeting the requirements of this Standard, but indicates the preferred clearance or method. Where an alternative is not specified, the engineering solution that most closely adheres to the preferred method is to be used. Where the requirements of more than one clause apply, all are to be satisfied.