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许多标准都提到等电位保护连接导体测试(protective bonding test)时,测试电流值应该为设备过电流保护设备额定值的2倍。; K+ u8 w$ K# r0 Z" W; P" H: B
为什么是2倍?还请高人指点。。。。谢谢!!1 `$ O* ~9 T. e+ r# y; K$ w7 Q/ t
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如下摘自IEC60950-1:2005" O/ e3 S9 j1 \- f/ `7 K4 h
The test current, duration of the test and test results are as follows:
[- q, b) c& w. ?a) For equipment powered from a MAINS SUPPLY, if the PROTECTIVE CURRENT RATING of the circuit under test (see 2.6.3.3) is 16 A or less, the test current is 200 % of the PROTECTIVE CURRENT RATING applied for 120 s. The resistance of the PROTECTIVE BONDING CONDUCTOR, calculated from the voltage drop, shall not exceed 0,1 Ω . After the test, the PROTECTIVE BONDING CONDUCTOR shall not be damaged." f: I7 {2 W* A" W1 s! i
b) For equipment powered from an AC MAINS SUPPLY, if the PROTECTIVE CURRENT RATING of the circuit under test exceeds 16 A, the test current is 200 % of the PROTECTIVE CURRENT RATING and the duration of the test is as shown in Table 2E.
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