|
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。- a; U9 Z3 s2 Z& x) ?
为什么是2倍?还请高人指点。。。。谢谢!!, e1 D% S2 g- ~* h7 I
8 _! G! F% f' T6 Q# ^' h/ `9 c
如下摘自IEC60950-1:20056 ?# g; S- j" b2 r0 d8 f
The test current, duration of the test and test results are as follows:: y; [+ @" V4 l1 X2 ]! l) I
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.! z3 p) p* S6 P5 S
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.
3 \$ }# H( T# I# ^" a9 l, d |
|