|
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。
9 N# C+ e1 l6 s) T& r为什么是2倍?还请高人指点。。。。谢谢!!
+ W+ o# m) `; ?5 W1 r `; g9 B. U. Y8 j" \, ?0 q" g5 k
如下摘自IEC60950-1:2005
3 U3 k' v. [( o' H$ z" kThe test current, duration of the test and test results are as follows:9 z: [( g2 c% o
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./ A) h' V- X8 C q& v
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.1 j8 ]3 r6 J4 v9 n7 r
|
|