ケーブル溝の砂充填問題
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質問：防爆エリア内のケーブル溝に砂を充填する際の具体的な要件は何ですか？例：砂の粒径は？ケーブル溝を埋める？海砂を禁止？ 大神、ありがとうございます！
回答してくださってありがとうございます！どの規格に基づいていますか？画像が少しぼやけていて、細かい文字がはっきり見えません。
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