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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 v# n6 G* E2 I为什么是2倍?还请高人指点。。。。谢谢!!
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/ x' ^8 d, N: K% _& m如下摘自IEC60950-1:2005
+ B! Q! |# D. e* U2 WThe test current, duration of the test and test results are as follows:" Z; ]5 _: a5 G0 i! T
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 F) [$ S! ~9 ~3 ]( a$ I9 y5 i- 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.
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