Draft Details

1.1 Scope

This Standard applies to electric supply and communication lines and equipment located

a) entirely outside of buildings;
b) outside of indoor and fenced supply stations;
c) and buildings, and also where the installations or equipment are inside buildings or sections of buildings where they are employed by a utility of

ai) an electric system;

bii) a communication system; or

ciii) a community antenna distribution system

in the exercise of its function as a utility.

1.2 Prior editionsExisting Installations

Existing installations meeting the requirements of 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 Applications

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, navigable waters, or land that is likely to be traversed by vehicles or pedestrians.

1.4 Deterministic and reliability-based design

This Standard presents a choice between deterministic and reliability-based design [L1] (RBD) methods. Reliability-based design methods are covered by CSA C22.3 No. 60826.

1.5 Minimum design requirements

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 Common use standards

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

1.7 Other Ttypes of construction

In some cases in this Standard, 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 Where practicable

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 should be used.

1.89 More than one clause applies

Where the requirements of more than one clause apply, all should be satisfied.

1.910 Shall, should, may, notes and annexes

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; and “may” is used to express an option or that which is permissible within the limits of the Standard.

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.