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发表于 2009-7-25 22:20
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回 nw-interfans " x! b& g8 b7 a& e* z/ P8 W+ h
一,10章,接地措施:
* U# w) y* _8 [. u7 I! q b) for metal parts connected to an earthing terminal or earthing plug pin, by the following test.
# Y2 z3 H9 i( F: dA current of 25 A ± 0.75 A, derived from an a.c. source having a no-load voltage not exceeding 12 V, is passed for s between the remote end of the protective conductor of a 3-core flexible cord (cut to a length of 150 mm ± 5 mm measured from the nearest edge of the earthing pin) and the remote end of the earthing plug pin and any accessible metal part intended to be earthed,/ a4 ]$ r5 e- x$ w) h1 r, k
b)项总要求是连接到接地端子或接地插销的金属部件,但中间在描述过程中出现了“150mm三芯软线的最远端”,是否需要测量?如果象国标或IEC测量,根本就不会涉及到接地导线。. K& A$ H- ^2 }" ~2 z' b! C1 x
! W3 c, f4 d/ p( R5 w. l$ q: R二,11章,端子和端头:6BA的英式螺纹是英制电器螺纹,钻孔直径为2.4到2.5mm。
) s* S2 Q2 S) y. v+ V$ O 测量时如何进行呢?测量螺纹孔的内径吗?在2.4~2.5之间?
' ] K% b6 }* b5 D7 c1 e2 z 我觉得标准条款是讲端子螺钉,没涉及到螺纹孔。
- o: l% E n& I3 z1 f5 X Terminal screws shall have a declared outside diameter of not less than 3 mm or be not smaller than 6 B.A. |
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