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Undergrounding is the replacement of overhead cables providing electrical power or telecommunications, with underground cables. This is typically performed for aesthetic purposes, but also serves the additional significant purpose of making the power lines less susceptible to outages during high wind thunderstorms or heavy snow or ice storms. Undergrounding can increase the initial costs of electric power transmission and distribution but may decrease operational costs over the lifetime of the cables. ==History== Telegraph cable undergrounding was considered in Northern Germany as early as 1870.〔 page 42 édition de: 1870/02/25 (VOL1,N4) Titre : Journal télégraphique Éditeur : () (Berne) Date d'édition : 1870 Type : texte,publication en série imprimée Identifiant : ark:/12148/cb32802376k/date Source : Bibliothèque nationale de France, département Sciences et techniques, 4-V-1216 Relation : http://catalogue.bnf.fr/ark:/12148/cb32802376k Provenance : bnf.fr Date de mise en ligne : 25/05/2009 http://gallica.bnf.fr/ark:/12148/bpt6k5650101k 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Undergrounding」の詳細全文を読む スポンサード リンク
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