|
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。
# z; ~/ f* H% D6 N为什么是2倍?还请高人指点。。。。谢谢!!& _2 X) k$ w- d
' K' x! |8 }5 Z1 e* @6 h5 g: H2 s
如下摘自IEC60950-1:2005
$ Y! y8 R9 N5 C8 H2 V& fThe test current, duration of the test and test results are as follows:6 V3 v% t7 ~( d
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.* B% M, N; A$ |8 q! p0 q
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.
* p) y! ^2 k( h! j; ~- l. l |
|