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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。& z2 `( ]' o4 f' ?4 @4 P$ ]/ r
为什么是2倍?还请高人指点。。。。谢谢!!7 e8 q" x8 G& r8 d7 @
! s, \* o6 k& u1 i) c如下摘自IEC60950-1:2005
1 C& ^& x2 z w( \- Y" ]5 `The test current, duration of the test and test results are as follows:
" h& |! Y& B+ C; _ A1 ?4 O$ ga) 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.! \- J/ m$ J/ Z* q. R4 y
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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