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12.3.8 An open hole in a box, such as a mounting-screw hole, shall have no dimension larger than 6.7 mm (0.265 in), except that a pry out hole or slot may be provided in a knockout for 1 in or smaller trade size conduit, provided that the area of the hole or slot is no more than 26 mm2 (0.040 in2)." {1 ?( G; B7 [+ F9 `
接线盒的开孔,例如螺丝孔,尺寸不得大于6.7 mm,除非为1英寸或者更小的规格型号电工管的敲落空上可以提供一个pryout hole或者槽,所述空或槽的面积不超过26mm2& J2 U, {1 @# [1 T2 u7 O0 }
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两个疑惑% ]1 }! v) d2 a5 ?4 E" |8 s
1.目前感觉这个6.7mm的要求太苛刻,实际市场上很难做到,仅仅对于圆形孔还好说,但是难免有些长条的缝,就很难满足,各位同仁怎么处理的?! M0 Y6 X$ q' U- d: ]
2.后半部分的pryout hole或者槽是指敲落片如图部分吗?9 ^% g& g* l1 @- ^! v/ o& U
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