营业线设备安全限界有何规定？
["\u7535\u6c14\u5316\u94c1\u8def\u63a5\u89e6\u7f51\u652f\u67f1\u5916\u4fa72m\uff08\u63a5\u89e6\u7f51\u652f\u67f1\u5916\u4fa7\u9644\u52a0\u60ac\u6302\u59162m\uff0c\u6709\u4e0b\u951a\u62c9\u7ebf\u5730\u6bb5\u65f6\u5728\u4e0b\u951a\u62c9\u7ebf\u59162m\uff09\u3001\u975e\u7535\u6c14\u5316\u94c1\u8def\u4fe1\u53f7\u673a\u7acb\u67f1\u5916\u4fa71m\u8303\u56f4\u79f0\u4e3a\u8425\u4e1a\u7ebf\u8bbe\u5907\u5b89\u5168\u9650\u754c\u3002"]