|
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。
0 r- R' O7 T0 j9 n为什么是2倍?还请高人指点。。。。谢谢!!" |, {4 F/ s( N9 y' m- f/ n9 G7 O1 g
# _" u+ X! @* w* j如下摘自IEC60950-1:2005+ ~/ f! v- ~3 G: {. F R* A7 j- v1 |6 J
The test current, duration of the test and test results are as follows:
& |6 E+ l6 q- V6 W4 }- [5 h$ I1 {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.7 F0 j. o) x% U$ h2 c
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.9 T5 f0 m, \' i6 C# x H7 L
|
|