1756-DMCF001
1756-DMCF001
安全防范系統(tǒng)接地，按用途為有保護(hù)性接地和功能性接地，保護(hù)性接地分為防電擊接地、防雷接地、防靜電接地和防電蝕接地：功能性接地分為：工作接地、邏輯接地、屏蔽接地和信號(hào)接地。不同的接地有不同的要求。應(yīng)接設(shè)計(jì)決定的接地施工。
系統(tǒng)的接地裝置應(yīng)符合下列要求：當(dāng)配管采用鍍鋅電管時(shí)，除設(shè)計(jì)明確規(guī)定處，管子與管子、管子與金屬盒子連接后不必跨接，位應(yīng)遵守下述規(guī)定： 管子間采用螺紋連接時(shí)，管端螺紋長(zhǎng)度不應(yīng)小于管接頭的l／2，螺紋表面應(yīng)光滑，無銹蝕、缺損，在螺紋上應(yīng)涂上導(dǎo)電性防腐脂。連接后，螺紋應(yīng)外露2—3扣。管子間采用帶有緊定螺釘?shù)奶坠苓B接時(shí)，螺釘應(yīng)擰緊：在振動(dòng)的場(chǎng)所，緊定螺釘應(yīng)有防松動(dòng)措施。
配管采用黑鐵管時(shí)，若設(shè)計(jì)不要求跨接，則不必跨接，若要求，黑鐵管之間及黑鐵管與裝線盒之間可采用架鋼跨接，單面焊接，跨接長(zhǎng)度不宜小于跨圓鋼直徑的六倍；黑鐵管與鍍鋅橋架之間跨接時(shí)，應(yīng)在黑鐵管端部焊一只銅螺栓，用不小于4mm的銅導(dǎo)線與鍍鋅橋架相連。
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