Intrinsically safe telephone

Details Intrinsically safe telephone Intrinsically safe telephone

H - Electricity

04

M

379/63

H04M 19/08 (2006.01) H04M 1/18 (2006.01) H04M 1/31 (2006.01) H04M 1/60 (2006.01) H04M 19/04 (2006.01)

Patent

CA 1272319

ABSTRACT 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 tele- phone line interface located in a safe environment. The tele- phone 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 instru- ment is off hook. The telephone line interface further includes a bootstrap power supply for powering the single line instrument whenever the single line instrument is off hook. The intrinsical- ly safe telephone is line powered and requires no auxiliary power in the hazardous environment. The intrinsically safe telephone is useful in all hazardous environments as classified by the National Electrical Code and requires no explosion-proof housing.

534714

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