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回 nw-interfans
, d$ B6 F+ O2 h5 @, B/ u+ t一,10章,接地措施:
8 F; E) D2 j) Q b) for metal parts connected to an earthing terminal or earthing plug pin, by the following test.
2 F6 S: {- t8 h" q qA 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,* e B: w0 y g# {) _9 ?
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。
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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。/ F1 B+ H5 V: N, a; b# a5 @
测量时如何进行呢?测量螺纹孔的内径吗?在2.4~2.5之间?
* [2 R8 ^( u4 f" r F8 }3 D 我觉得标准条款是讲端子螺钉,没涉及到螺纹孔。
' g" k& b$ H6 s0 _# @ 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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