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メインケーブル溝に砂を入れる?

2016-08-21View Original

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マンホールから敷設されるケーブル溝には砂を入れる必要があったよね?助けてください。
Reply #22016-08-21
配電室の出入り口部分のみに砂を充填し、外部のケーブル溝から何らかの工程用媒体が配電室に混入するのを防ぐ。

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