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-48 Volts was selected because it was ...

1-generally regarded as safe

2-enough to get through thin wiring

3-you can generate from batteries easily

4-negative because it would resist corrosion

These are top 4 reasons, there are others ...

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13y ago
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14y ago

in order to stop the oxidation process

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Q: Why Telephone Exchange works on -48 V?
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