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-ve is "cathodic protection" , First developed to keep the copper hulls of British naval ships from corroding, this technology has been applied to protecting everything from oil rigs to gas pipelines to telephony cabinets. By keeping the cabinet frame at a more positive voltage than ground, corrosion is reduced and the life of the equipment is increased. as simple as this!
used for Negative Polarity for BTS commission
negative polarity is achieved by grounding the positive terminal of power supply system and the battery bank. This is done to prevent electrolysis depositions.
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