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| Re: Today is fifty years since the big northeast blackout (1374172) | |||
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Re: Today is fifty years since the big northeast blackout |
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Posted by SelkirkTMO on Wed Nov 18 19:04:43 2015, in response to Re: Today is fifty years since the big northeast blackout, posted by Spider-Pig on Wed Nov 18 18:57:48 2015. Not so back in those days - lit dials required power from a transformer plugged into the wall to light up the bulb that provided lit dials, such as the original "Princess" phone and later models. That's why all phone jacks were provided with four wires - red and green were your voice pair and the black and yellow wires would carry 6 volts AC to light the bulb(s).If you used the nominal 50 volts provided, that would close the circuit. Loop current only provided a maximum of 20 milliamperes for voice anyway, and that was insufficient to light a bulb. |
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