Preface
This is the second edition of CSA C22.2 No. 235, Supplementary protectors, one of a series of Standards issued by the Canadian Standards Association under Part II of the Canadian Electrical Code. It supersedes the previous edition published in 1989.
This Standard applies to manual-reset protective devices known as supplementary protectors, which are intended for use as components within an appliance or other electrical equipment to provide protection against overloads. They supplement the branch-circuit protection.
One of the significant technical changes to this Standard is the addition of the new category, “Suitable for further use”.
For general information on the Standards of the Canadian Electrical Code, Part II, see the Preface of the latest edition of CAN/CSA-C22.2 No. 0.
This Standard was prepared by the Subcommittee on C22.2 No. 235, under the jurisdiction of the Technical Committee on Industrial Products and the Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the Technical Committee.
This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.
Scope
1.1
This Standard applies to supplementary protectors* of the manual-reset type that may or may not have a manual means of operation and are intended for use as components within appliances or other electrical equipment where branch-circuit overcurrent protection is already provided (or is not required), in accordance with the Rules of the Canadian Electrical Code, Part I.
The acceptability of the component is to be determined in its final application. *This is abbreviated to protector throughout this Standard for convenience.
1.2
This Standard applies to
(a) overcurrent-trip protectors;
(b) overvoltage-trip protectors;
(c) undervoltage-trip protectors;
(d) relay-trip protectors; and
(e) accessory devices such as alarm and auxiliary switches that are installed in or on the protector to perform an auxiliary function.
1.3
This Standard applies to single- and multi-pole protectors for controlling single or polyphase ac or dc loads rated 600 V or less.
1.4
This Standard applies both to protectors capable of interrupting short-circuit currents and to protectors not capable of interrupting short-circuit currents.
1.5
Protectors covered by this Standard are not to be used for overcurrent protection of circuits defined as .branch circuits. by the Canadian Electrical Code, Part I.
1.6
This Standard applies to protectors that may be used as overcurrent protection within electrical equipment in the following types of circuits, as defined by the Canadian Electrical Code, Part I:
(a) control circuits;
(b) extra-low-voltage power circuits;
(c) remote control circuits; and
(d) signal circuits.
Note: Protectors considered as overcurrent protection in this Clause have application codes SC:U3 and TC3.
1.7
In CSA Standards, 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. Legends to equations and figures are considered requirements.
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