Article View: sci.electronics
Article #21899telephone systems
From: Daniel P. Esmond
Date: Thu, 28 Dec 1989 18:25
Date: Thu, 28 Dec 1989 18:25
32 lines
1898 bytes
1898 bytes
HELP!HELP!HELP!HELP!HELP!HELP!HELP!HELP!HELP!HELP!HELP!HELP!HELP! Last night I went to change a phone jack from a four pronger to a modular, in the house that I rent. Opening the old outlet I found two sets of wires feeding to the outlet (not unusual), and proceeded to change the plate. Touching a wire I recieved a HV shock which didn't surprise me, but what did surprise me is that the other phones in the house didn't ring the same time I received the shock. Grabbing my meter I tested the line, and sure enough there is a constant 120 volts on the green wire. Being curious I began to trace the wires throughout the house and found that all the outlets were wired daisy chain fashion, and there is an AC transformer in the loop. The secondary is only 16 volts, so trying to locate the source of the high potential I disconnected the main line from the loop. The loop went dead, and the main line still had 120 volts open circuit coming into the house. Do all phone lines feed 120 volts constant? What is the transformer for? Why are all the phones daisy chained instead of parallel? I don't want to smoke a brand new $200 phone and answering combo, but I do want to get this hooked up as soon as possible (hopefully tonight). I thought phone lines ran a low voltage trickle and rang the line with about 75 volts. What could the constant 120 volts be for? Will it damage my stuff? Thanks!Thanks!Thanks!Thanks!Thanks!Thanks!Thanks!Thanks!Thanks! - Dan esmond@crd.ge.com
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arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!zaphod.mps.ohio-state.edu!rpi!crdgw1!jupiter!esmonddpShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!zaphod.mps.ohio-state.edu!rpi!crdgw1!jupiter!esmonddp From: esmonddp@jupiter.crd.ge.com (Daniel P. Esmond) Newsgroups: sci.electronics Subject: telephone systems Keywords: jack wiring telephone Message-ID: <4370@crdgw1.crd.ge.com> Date: 28 Dec 89 18:25:25 GMT Sender: news@crdgw1.crd.ge.com Lines: 32