How much power is supply through telephone line ( domestic ).?

Question

power in telephone line

Answer 1

In the U.K., the line voltage is nominally 50V DC.   Off-hook voltages (anywhere in the world) will vary with the type of phone, the length of the line from the central office, etc.  Close by you could see 20V.  At the far end of a very long line you might be down to 6 or 7 volts.

The 90V (give or take) AC ringing will also be somewhat lower at the far end of a long line, again depending upon other factors such as the number of phones being rung at your house.

Note also that when the 90V AC ringing is applied, that is generally superimposed on top of the 48 to 50V battery.

The current available is restricted by the resistance of the line plus the equipment at the exchange, but there's enough there to "bite" you in certain circumstances.

Answer 2

actually is is about -10 to -15vdc while off hook, -48vdc while on hook, and ring is 90vac at 20 hz

Answer 3

Where I live in Eastern US, the power on the line is around 10V. The ring voltage is 90 V (AC)....(Verizon)

Answer 4

20V off the hook.  When it Rings; about 48v.

It usually will not give out more then 50ma.

Answer 5

12 volts DC on the phone and 110 volts on the ringer, at least that is what it used to be when I was installing telephones back in the stone age.