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7.10 An opening in the enclosure that has a minor dimension of less than 1 inch (25.4 mm) is acceptable
% p0 w. W5 Z1 ?; s& l' ?if a probe as illustrated in Figure 7.2, inserted through the opening, cannot be made to touch any6 n7 [; A1 F/ l$ y2 M
uninsulated live part of film–coated wire that involves the risk of electric shock. The probe shall be applied3 L. b* B5 H; [2 H! h/ P$ J: A+ \
in all possible articulated positions before, during, and after insertion.% s6 m: t# B- U# v
7.11 An opening that has a minor dimension of 1 inch (25.4 mm) or more, in an enclosure, as illustrated
! t: w3 ?0 ~: Q3 ]9 i/ Zin Figure 7.3, is acceptable if, within the enclosure, there is no uninsulated live part or film-coated wire# e: V, M6 f8 [* w5 h2 h
less than;, c3 M7 R3 \' ?) e
a) R distance from the inside edge of the perimeter of the opening and2 `/ g/ X8 t" p& Y; t
b) X distance from the plane of the opening.
/ z }. w; L8 k0 R2 l- a" N$ z! D+ TT equals the enclosure thickness, R equals X minus T, and X equals 5 times the diameter of the largest
% T: Z7 r8 d1 L7 Lround rod that can be inserted through the opening but not less than 6-1/16 inches (154 mm). In
& Z# z( S- @1 z7 ^evaluating an opening, any barrier located within the volume is to be ignored unless it intersects the
- E. y( i6 b7 l8 Hboundaries of the volume in a continuous, closed line.
/ V, Y. d; B% d2 \: D. D
0 N# T8 X) W: G6 Q2 z7.11是否说在一个符合7.3描述的外壳上,当有大于或等于25.4mm的开口时,如果在外壳的以下范围内没有uninsulated live part or film-coated wire的是可以接受的?
- L5 H3 L9 m" N* e5 v. T这个范围是:A,从开口内边角算起的R距离间。R=外壳厚度+X
; J) `' V. O" s" _ B,从开口平面算起的X距离间。X=MAX.(5*Rod直径,154mm) |
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