Intrinsically safe telephone

Details Intrinsically safe telephone Intrinsically safe telephone

H - Electricity

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H04M 7/00 (2006.01) H04M 1/18 (2006.01) H04M 1/60 (2006.01) H04M 1/78 (2006.01) H04M 9/00 (2006.01) H04M 19/04 (2006.01) H04M 19/08 (2006.01)

Patent

CA 2036521

An intrinsically safe telephone as provided for use in hazardous areas. The telephone includes a single line instrument located in the hazardous area which, in turn, is coupled by a two-wire transmission path to a shunt diode barrier and a telephone line interface located in a safe environment. The telephone line interface reduces power of incoming ringing and audio signals. The telephone line interface further includes an off-hook indicating circuit which senses when the single line instrument is off-hook. The intrinsically safe telephone is useful in all hazardous environments as classified by the National Electrical Code and requires no explosion-proof housing.

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