CAN/CSA-C22.2 NO. 225-M90 (R1997)
Telecommunication Equipment
Product Details
Preface
This is the first edition of CAN/CSA-C22.2 No. 225. It is one of a Series of Standards issued by the Canadian Standards Association under Part II of the Canadian Electrical Code.
This Standard is intended to replace CSA Standard C22.2 No. 0.7, equipment Electrically Connected to a Telecommunication Network, for equipment whose primary use and function is telecommunications.
In developing this Standard, representatives from the CSA subcommittee attended Underwriters Laboratories Industrial Advisory Conferences on their Standard No. 1459. A representative from Underwriters Laboratories also attended the subcommittee meetings on CSA Standard CAN/CSA-C22.2 No. 225, in order to achieve an acceptable level of harmonization between both Standards. It is anticipated that this cooperation will continue on future activities.
For general information on the Standards of the Canadian Electrical Code, Part II, see the Preface of CSA Standard C22.2 No. 0, General Requirements--Canadian Electrical Code, Part II.
This Standard was prepared by a Subcommittee of the Technical Committee on Consumer and Commercial Products under the jurisdiction of the Steering Committee on The Canadian Electrical Code, Part II, and was formally approved by these Committees. It has been approved as a National Standard of Canada by the Standards Council of Canada.
Scope
1.1
This Standard applies to equipment intended to be electrically connected to a telecommunication network and receives its power from the telecommunication network alone, or from an ac or dc source, or from any combination thereof. The network has a normal operating voltage to ground of less than 150 V rms and the equipment is designed to be operated in nonhazardous locations in accordance with the Canadian Electrical Code, Pat I.
Notes:
(1) In some existing telecommunication networks, the rms value of 150 V may be exceed during alerting.
(2) An ac or dc power source includes an ELV power supply.
1.2
This Standard applies to equipment intended to function at telecommunication network operating voltages of less than or equal to 56.5 V dc with a source impedance of 300 to 1600 Ω, recognizing that alerting and text voltages higher than 56.5 V are generally intermittent and will normally be present over a small portion (less than 1%) of the usage of the equipment.
1.3
This Standard is concerned solely with the requirements for safety from electrical shock, energy hazards, electrical fire hazards, and related thermal and mechanical hazards, including acoustic shock.
1.4
This Standard applies to cordless telephones that are powered by Class 2 circuits but does not apply to cellular radio telephones and other radio receive/transmit type systems. In addition, this Standard may not apply to equipment that may be electrically connected to a telecommunication network and which is covered by any other Standard which addresses this network interfacing.
1.5
This Standard does not apply to electrical equipment that electrically connects with a telecommunication network but whose primary function is other than telecommunication.
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