Will the phone burn out if 60V (25Hz) is applied to it while the handset is up?

Question

Electronics

Will the phone burn out if 60V (25Hz) is applied to it while the handset is up?

Answer 1

It probably won't burn. On old PBXs, switching from ringing to conversational mode was done by a relay circuit, and for some time, alternating current could pass to the phone when the receiver was off-hook. When the receiver was off-hook, 60V DC was supplied through the relay and conversational circuits, as a result of which 10-15 volts remained on the phone.
ps Why apply 60V (25Hz) to it?

Answer 2

Generally an interesting question. There is GOST 28384-89, but there is no mention of voltage, sort of.
If we generalize for all models (there was a standard of 48 volts over the hill), then approximately 40-60 volts you have a nominal call voltage with alternating current, not 110 volts constant as they often confuse, but 40-60 alternations, the sum of the amplitude of which gives this magic figure in 110 volts.
When talking, it drops to about 12 volts, also with alternating current.
But if during a conversation you apply instead of 12 volts a change, 60 volts a change (where you get it from is interesting to look at the model of this device too)) then most likely nothing will happen, again it depends on the phone model (from behind a hillock or from the USSR ). I think if the device draws 60 volts in the passive, then when 60 volts are applied at the time of the conversation, it will not be particularly offended.
Tk. as with pulse dialing, the voltage in the circuit can jump up to 60 volts.
For good ats-ka, whatever it is, it should have foreseen this and not let you do it. But if it does, then it really makes sense to try and unsubscribe about the results =)