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undergrounding : ウィキペディア英語版
undergrounding

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


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