一、網絡機柜需要接地嗎
需要。
根據國家建筑規范,不管是否采用了屏蔽布線系統,綜合布線系統所用的網絡機柜都要求接地。網絡機(ji)柜之所(suo)以要接地線,主要是(shi)為了保(bao)證機(ji)房內工作人員的人身安(an)全,同(tong)時起(qi)到(dao)保(bao)障(zhang)設備安(an)全,限制各火線對地電壓(ya)不超過250V,減輕高壓(ya)竄(cuan)入低(di)壓(ya)電路的危險。
二、網絡機柜如何接地線
網絡機柜常用(yong)的接(jie)(jie)(jie)(jie)地(di)(di)(di)方案是(shi)在弱電(dian)機房、弱電(dian)間、電(dian)信(xin)間中建(jian)立(li)獨(du)立(li)的弱電(dian)接(jie)(jie)(jie)(jie)地(di)(di)(di)導(dao)線(xian),該導(dao)線(xian)在建(jian)筑物的總接(jie)(jie)(jie)(jie)地(di)(di)(di)樁上(shang)與其他(ta)接(jie)(jie)(jie)(jie)地(di)(di)(di)導(dao)線(xian)共地(di)(di)(di),形成建(jian)筑物內的聯合接(jie)(jie)(jie)(jie)地(di)(di)(di)體,主要接(jie)(jie)(jie)(jie)三(san)條地(di)(di)(di)線(xian):防雷地(di)(di)(di)線(xian)、保護(hu)地(di)(di)(di)線(xian)、直流邏輯(ji)地(di)(di)(di)線(xian):
1、防雷(lei)地線一般使用建筑(zhu)物的(de)防雷(lei)地線。在(zai)高落雷(lei)區要(yao)構筑(zhu)單獨的(de)避雷(lei)鐵塔(ta)。
2、保(bao)護地線(xian)(xian)(xian)(xian)(xian)一(yi)般指零(ling)線(xian)(xian)(xian)(xian)(xian):我國現(xian)在電力系(xi)統一(yi)般采用三相四線(xian)(xian)(xian)(xian)(xian)制供電,也就是(shi)進戶線(xian)(xian)(xian)(xian)(xian)有三根火線(xian)(xian)(xian)(xian)(xian)(相線(xian)(xian)(xian)(xian)(xian))一(yi)根零(ling)線(xian)(xian)(xian)(xian)(xian)。零(ling)線(xian)(xian)(xian)(xian)(xian)在變壓器中性點接(jie)地。機(ji)(ji)房內配電箱(xiang)外(wai)殼(ke)以(yi)及(ji)空調、新風機(ji)(ji)外(wai)殼(ke)和零(ling)線(xian)(xian)(xian)(xian)(xian)相接(jie)作為保(bao)護地線(xian)(xian)(xian)(xian)(xian)。計(ji)算機(ji)(ji)外(wai)殼(ke)不要和零(ling)線(xian)(xian)(xian)(xian)(xian)相接(jie)。
3、機房(fang)和大型設備安(an)裝時一(yi)般要求的地線(xian)指得是直流邏輯地線(xian)。
在同(tong)一個網(wang)絡機柜內,往往會有數個乃至數十個屏蔽(bi)配線(xian)架,它們應(ying)(ying)(ying)采用(yong)星(xing)型結(jie)構完成接(jie)(jie)地(di)(di)連接(jie)(jie)。屏蔽(bi)配線(xian)架的(de)接(jie)(jie)地(di)(di)應(ying)(ying)(ying)直接(jie)(jie)接(jie)(jie)到機柜的(de)接(jie)(jie)地(di)(di)銅(tong)排上,形成機柜內的(de)星(xing)型接(jie)(jie)地(di)(di),其接(jie)(jie)地(di)(di)線(xian)建議(yi)使用(yong)6mm2以(yi)上的(de)網(wang)狀(zhuang)接(jie)(jie)地(di)(di)線(xian),利用(yong)其表面積大的(de)特(te)點提高線(xian)纜的(de)高頻特(te)性。為了防止網(wang)狀(zhuang)接(jie)(jie)地(di)(di)線(xian)短路,在接(jie)(jie)地(di)(di)線(xian)外應(ying)(ying)(ying)套塑料(liao)軟管(guan)。
三、網絡機柜接地規范要求
1、地線安裝時要求接地面(mian)積(ji)不能小于(yu)1m2。
2、接地(di)點距(ju)離建筑物大于(yu)1m。
3、根(gen)據(ju)地(di)質(zhi)情況決定(ding)接地(di)體所(suo)使(shi)用(yong)的(de)材質(zhi),使(shi)用(yong)面積為1㎡厚(hou)度為3mm以上的(de)銅(tong)板(ban)最(zui)好,如為減少造價或(huo)找不到銅(tong)板(ban),可以使(shi)用(yong)直徑(jing)1.5英寸、長2.5m的(de)鍍鋅鐵管代替(ti)。