Preface

This is the second edition of CSA C411.7, Composite insulators for guy wires. It supersedes the previous edition, published in 2011.

This Standard is based on the requirements of Canadian Electricity Association (CEA) LWIWG-03 (96), Guy Composite Insulator for Guy Wires (used with permission from CEA).

The co-operation of CEA and the contribution of its members are gratefully acknowledged.

Scope

1.1
This Standard covers the requirements for guy composite insulators used in guy wires on overhead distribution lines operating at nominal voltages up to and including 75 kV. Guy insulators insulate or isolate guy wires for corrosion protection, higher insulation levels, clearances for maintenance and normal operation, and safety for the public and workers (joint-use). Guy composite insulators are subjected to tensile and torsional loads.

The composite insulators are intended to operate in a service environment within a temperature range of – 50 to 50 °C.

1.2
This Standard defines terms, prescribes test methods, and specifies acceptance or failure criteria. Clauses 4 to 8 specify the material, product qualification, construction, and test requirements applicable to these insulators.

1.3
This Standard deals with guy composite insulators having a core with metal fittings and a coating. The core of the insulator has resin-impregnated glass fibres and is protected with a UV resistive coating.

1.4
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.