防爆電氣設(shè)備之所以需要接地線,是為了確保安全和防止靜電積聚、電磁輻射等問題,因?yàn)樵诒ㄐ晕kU(xiǎn)環(huán)境下,一點(diǎn)點(diǎn)火花都可能會(huì)引發(fā)火災(zāi)或者爆炸,但接地線也是有標(biāo)準(zhǔn)規(guī)定的。

防爆電氣設(shè)備接地線要求
首先防爆電氣設(shè)備的金屬外殼、金屬構(gòu)架、金屬配線管及其配件、電纜保護(hù)管、電纜的金屬保護(hù)套等非帶電的裸露金屬部分,均應(yīng)接地。像此類要求,在>>>現(xiàn)場防爆檢測(cè)常見問題總匯<<<一文章中我們有講過,感興趣的朋友可以去看一看,言歸正傳。
其次爆炸危險(xiǎn)場所除2區(qū)內(nèi)照明燈具以外所有的電氣設(shè)備,應(yīng)采用專用接地線;宜采用多股軟絞線,其銅芯截面積不得小于4毫米。金屬管線、電纜的金屬外殼等,應(yīng)作為輔助接地線。
注意:不能用輸送易燃物質(zhì)的金屬管道作為接地線。
另外爆炸性危險(xiǎn)場所接地干線與接地線不得小于2處,接地干線通過與其他環(huán)境共用的隔離墻時(shí)應(yīng)用鋼管保護(hù)。
最后是鎧裝電纜引入電氣設(shè)備時(shí),其接地芯線應(yīng)與設(shè)備內(nèi)接地螺栓連接,其鋼帶或金屬護(hù)套應(yīng)與設(shè)備接地螺栓連接。
如果防爆電氣設(shè)備接地時(shí),不注意上面所說的四點(diǎn),在現(xiàn)場防爆電氣安全檢測(cè)時(shí),可能會(huì)面臨不合格的情況,而且在爆炸性危險(xiǎn)環(huán)境中,諸如此類的錯(cuò)誤,極容易引發(fā)火災(zāi)以及爆炸,造成人員傷亡或經(jīng)濟(jì)損失,這就是為什么爆炸性環(huán)境都需要進(jìn)行現(xiàn)場防爆安全檢測(cè),驗(yàn)證通過之后才能正常投入使用和生產(chǎn)的原因了。









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