| 31. | By 1947, underground cables had replaced overhead telephone and telegraph wires that snapped under the weight of ice.
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| 32. | In 1913, underground cabling for telephony was fully completed and the tower no longer served its original purpose.
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| 33. | At that corner a NYNEX crew, Paul Guiney and John Naughton, was down a manhole, laying underground cable.
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| 34. | Long underground cables have significant capacitance, which may reduce their ability to provide useful power to loads . ""
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| 35. | Underground cables can transmit power across densely populated or areas where land is costly or environmentally or aesthetically sensitive.
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| 36. | Electrical equipment ignited gas that had migrated from a line pierced months earlier by a contractor laying underground cable.
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| 37. | The line was 200 kilometres long, with 190 kilometres run overhead and 10 kilometres as paper insulated underground cable.
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| 38. | Earlier that same day, SFO experienced a three-hour power outage when a high-voltage underground cable exploded during some construction work.
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| 39. | The zone is a licensee of power distribution, and supplies power to the units via the network of underground cables.
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| 40. | Overhead transmission is used otherwise because, for a given voltage level, overhead conductors are much less expensive than underground cables.
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