CSA C22.2 NO 225
|Publication Date:||1 March 1990|
This Standard applies.to equipment intended to be electrically connected to a telecommunication network and receives its power from the telecommunication networakl one, or from an ac or dc source, or from any combination thereof. The network has a normal operating voltage to ground olfe ss than 150 V rms and the equipment is designed to be operated in nonhazardous locationisn accordance with the Canadian Electrical Code , Part I.
(1) In some existing telecommuni
(2) An ac or dc power source includes an ELV power supply.
This Standard applies to equipment intended tfou nction at telecommunication network operating voltages of less than or equal to 56.5 V dc with a source impedance of 300 to 1600 Q, recognizing that alerting and test voltages higher th5a6n.5 V are generally intermittent andw ill normally be present over s maa ll proportion (less than 1%) of the usage of the equipment.
This Standard is concerned solely with the requirements fors afety from electrical shock, energy hazards, electrical fire hazards, and related thermal and mechanical hazards, including acoustic shock.
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 teoq uipment that may be electrically connected to a telecommunication network and whicihs covered by any other Standard whicha ddresses this network interfacing.
This Standard does not apply to electrical equipment that electrically connects with a telecommunication network wbhuots e primary function is other than telecommunication.