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1利(li)用(yong)(yong)柱內(nei)主筋(jin)做(zuo)引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)Φ14的(de)(de)(de)可用(yong)(yong)4根(gen)(gen)、Φ16以(yi)上(shang)的(de)(de)(de)用(yong)(yong)2根(gen)(gen)并用(yong)(yong)圓鋼(gang)(gang)（Φ12以(yi)上(shang)）或(huo)(huo)(huo)(huo)扁鋼(gang)(gang)環(huan)上(shang)引(yin)(yin)(yin)出(chu)(chu)。 2鋼(gang)(gang)筋(jin)雙(shuang)面施焊是直(zhi)經(jing)的(de)(de)(de)6倍(bei)，如雙(shuang)面有困(kun)難(nan)時(shi)也可單面焊是直(zhi)經(jing)的(de)(de)(de)12倍(bei)。 3規范規定(ding)跨界(jie)鋼(gang)(gang)筋(jin)一(yi)般不(bu)小于(yu)直(zhi)徑10的(de)(de)(de)鋼(gang)(gang)筋(jin) 接(jie)(jie)(jie)(jie)(jie)地(di)(di)(di)引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)是指(zhi)一(yi)套完整(zheng)的(de)(de)(de)防(fang)雷(lei)(lei)(lei)(lei)裝(zhuang)置(zhi)包(bao)括(kuo)接(jie)(jie)(jie)(jie)(jie)閃(shan)器、引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)和接(jie)(jie)(jie)(jie)(jie)地(di)(di)(di)裝(zhuang)置(zhi)。引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)指(zhi)連接(jie)(jie)(jie)(jie)(jie)接(jie)(jie)(jie)(jie)(jie)閃(shan)器與接(jie)(jie)(jie)(jie)(jie)地(di)(di)(di)裝(zhuang)置(zhi)的(de)(de)(de)金(jin)屬導(dao)(dao)體。防(fang)雷(lei)(lei)(lei)(lei)裝(zhuang)置(zhi)的(de)(de)(de)引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)應(ying)(ying)(ying)(ying)滿足(zu)機(ji)械(xie)強度(du)、耐(nai)腐(fu)(fu)蝕(shi)和熱穩(wen)定(ding)的(de)(de)(de)要(yao)求。 ? ????（1）接(jie)(jie)(jie)(jie)(jie)地(di)(di)(di)引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)一(yi)般采(cai)用(yong)(yong)圓鋼(gang)(gang)或(huo)(huo)(huo)(huo)扁鋼(gang)(gang)，其(qi)尺(chi)寸和防(fang)腐(fu)(fu)蝕(shi)要(yao)求與避雷(lei)(lei)(lei)(lei)網、避雷(lei)(lei)(lei)(lei)帶相同。用(yong)(yong)鋼(gang)(gang)絞(jiao)線(xian)(xian)(xian)(xian)作引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)，其(qi)截(jie)面積(ji)不(bu)得(de)(de)小于(yu)25mm2。用(yong)(yong)有色(se)金(jin)屬導(dao)(dao)線(xian)(xian)(xian)(xian)做(zuo)引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)時(shi)，應(ying)(ying)(ying)(ying)采(cai)用(yong)(yong)截(jie)面積(ji)不(bu)小于(yu)16mm2的(de)(de)(de)銅導(dao)(dao)線(xian)(xian)(xian)(xian)。 ????（2）引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)應(ying)(ying)(ying)(ying)沿(yan)(yan)建(jian)筑(zhu)物(wu)外墻敷(fu)設，并應(ying)(ying)(ying)(ying)避免彎曲，經(jing)最短途徑接(jie)(jie)(jie)(jie)(jie)地(di)(di)(di)。 ????（3）采(cai)用(yong)(yong)多條引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)時(shi)，為了便于(yu)接(jie)(jie)(jie)(jie)(jie)地(di)(di)(di)電(dian)阻和檢查引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)、接(jie)(jie)(jie)(jie)(jie)地(di)(di)(di)線(xian)(xian)(xian)(xian)的(de)(de)(de)連接(jie)(jie)(jie)(jie)(jie)情況(kuang)，宜在各引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)距地(di)(di)(di)面高約(yue)1.8m處(chu)設斷接(jie)(jie)(jie)(jie)(jie)卡(ka)。 ????（4）采(cai)用(yong)(yong)多條引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)時(shi)，一(yi)類(lei)防(fang)雷(lei)(lei)(lei)(lei)建(jian)筑(zhu)物(wu)和第(di)二(er)類(lei)防(fang)雷(lei)(lei)(lei)(lei)建(jian)筑(zhu)物(wu)至少(shao)應(ying)(ying)(ying)(ying)有兩(liang)條引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)，其(qi)間距離(li)分別不(bu)得(de)(de)大于(yu)12m和18m；第(di)三類(lei)防(fang)雷(lei)(lei)(lei)(lei)建(jian)筑(zhu)物(wu)周長超(chao)過25m或(huo)(huo)(huo)(huo)高度(du)超(chao)過40m時(shi)，也應(ying)(ying)(ying)(ying)有兩(liang)條引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)，其(qi)間距離(li)不(bu)得(de)(de)大于(yu)25m。 ????（5）在易(yi)受機(ji)械(xie)損傷的(de)(de)(de)地(di)(di)(di)方(fang)，地(di)(di)(di)面以(yi)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)0.3m至地(di)(di)(di)面以(yi)上(shang)1.7m的(de)(de)(de)一(yi)段引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)應(ying)(ying)(ying)(ying)加(jia)竹管、角鋼(gang)(gang)或(huo)(huo)(huo)(huo)鋼(gang)(gang)管保(bao)護。采(cai)用(yong)(yong)角鋼(gang)(gang)或(huo)(huo)(huo)(huo)鋼(gang)(gang)管保(bao)護時(shi)，應(ying)(ying)(ying)(ying)與引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)連接(jie)(jie)(jie)(jie)(jie)起來，以(yi)減小通過雷(lei)(lei)(lei)(lei)電(dian)流時(shi)的(de)(de)(de)電(dian)抗。 ????（6）引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)截(jie)面銹(xiu)蝕(shi)30% 以(yi)上(shang)者應(ying)(ying)(ying)(ying)予以(yi)更換。 ????（7）防(fang)直(zhi)擊雷(lei)(lei)(lei)(lei)的(de)(de)(de) 專設引(yin)(yin)(yin)下(xia)(xia)(xia)(xia)(xia)(xia)(xia)線(xian)(xian)(xian)(xian)距建(jian)筑(zhu)物(wu)出(chu)(chu)入口或(huo)(huo)(huo)(huo)者人行道邊(bian)沿(yan)(yan)不(bu)易(yi)小于(yu)3米。