通信解放的联合接地系统应按机械室分类接入联合接地排,连接处所如下:
· 各种直流电源母线需接地一极;
· 引入架,试验架,引入试验架,测量台、试验台的测试用地,以及测试仪表的接地;
· 各机械室不接入交流电源的金属机架(电源室的直流配电屏机架不应接地);
· 电报机械和自动电话中继器的工作接地;
· 引入电缆的绝缘金属护套,配线电缆的金属屏蔽层;
· 各通信机械室的保安避雷器(包括放电间隙,避雷器等);
· 容易产生噪声干扰的盘架单独接地。
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Joint grounding system of communication equipment room
· Various DC power busbars need to be grounded;
· Lead-in rack, test rack, lead-in test rack, test bench, test bench test ground, and test instrument grounding;
· Metal racks that are not connected to AC power in each mechanical room (the DC power distribution screen rack in the power room should not be grounded);
· Working grounding of telegraph machinery and automatic telephone repeaters;
· Insulating metal sheath of the imported cable and metal shielding layer of the distribution cable;
· Security surge arresters (including discharge gaps, surge arresters, etc.) of each communication machinery room;
· The rack that is prone to noise interference is grounded separately.
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