How much voltage comes up in the telephone lines present in our home?

Question

I want to ask that how much voltage comes up in the telephone lines present in our home? because i had heard that it comes around 40-50V in our telephone lines but Im not sure whether its AC voltage or DC Voltage

Answer 1

A telephone line voltage normally is 50 Volts DC when not used. Ring voltage could go up to 130 volts at 50 HZ. It is not advisable to use a lamp,because your telephone line may automatically trip open.

Answer 2

Phone Line Voltage

Answer 3

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RE:

How much voltage comes up in the telephone lines present in our home?

I want to ask that how much voltage comes up in the telephone lines present in our home? because i had heard that it comes around 40-50V in our telephone lines but Im not sure whether its AC voltage or DC Voltage

Answer 4

When the telephone is NOT in use (on hook) the voltage across the two wires (tip and ring) is about 48 volts D.C.



When the telephone IS in use (off hook) the voltage across the tip and ring wires drops to about 6 volts D.C.



When a ringing signal is being sent there is an A.C. voltage "superimposed" on top of the normal D.C. voltage. This "ringing voltage" is nominally about 90 volts at 20 Hertz (cycles) but could be as high as 130 volts and at different frequencies.

Answer 5

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I think you're on to something here. yes Edison tried it back in the day, but today we have much better technology. yes, DC current looses voltage over long distances, but I think in a home that wouldn't be a problem. Don't put the generator inside, put it outside next to your AC generator. use both, have both types of outlets in every room. get yourself some DC to DC power adapters for your high tech electronics. work on a way to select the voltage you're looking for in each room. Make the battery BIG so that having the generator run through a few gallons of gas will charge it and then some. have a power meter in the kitchen letting the family know how much charge is left. make this battery like 1gigaAmphours if that's possible. you can then use inverters to power a lamp or fridge. I wouldn't use things like hair dryers, microwaves, ovens, etc, or it will drain that battery fast. keep the questions coming dude.

Answer 6

If you are hoping to use the lamp as a visual indicator of when the phone rings, the ring voltage is AC. It would cost you more to buy the parts you needed than to just buy a visual alerting product for the hearing impaired. www.sandman.com



But to answer your original question, phone lines are considered to be DC voltage. This is because most landline telephone companies are government regulated, thus required to provide as close as possible to 99.999 up-time each year. To accomplish this large battery systems (called DC plants) are kept on-site to power the telco equipment incase of commercial power failures. All batteries are DC, thus the line power is DC. Telco lines do use some AC power on the line, but this is only used to "ring" the subscribers line.

Answer 7

It depends on the phone company but about 5 V d.c is common. Higher voltages would be too dangerous for normal use.

Answer 8

48 volts DC standard. When in use up to 90 volts AC

Answer 9

30-50v dc