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why we use negitive voltage

Sent to General Experts December 06 12:57 AM

with a lot of telecommunications equipment -48v is applied, where positive is common. Why is this practiced and are there benefits to have it this way instead of using negitive for common?

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December 12 9:05 PM (6 days and 20 hours later)
         
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December 12 9:07 PM (1 minute and 51 seconds later)
         
Why was this practise adopted?
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