|
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。7 n' X: h+ L$ Z& ~' y
为什么是2倍?还请高人指点。。。。谢谢!!
7 O1 |" Z0 Y r7 a; H2 A- m
" x5 p1 h& M$ h" b1 ]/ o如下摘自IEC60950-1:2005
4 P( F0 d: P7 }, ZThe test current, duration of the test and test results are as follows:
7 e$ l( o$ \, W e3 |; _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.
4 e4 ^3 U/ w. i" _) P* Vb) 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.
" o4 ^) p" e) f; o |
|