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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
% c7 t- X! J- _4 @9 P$ V7 Hif a probe as illustrated in Figure 7.2, inserted through the opening, cannot be made to touch any
9 a1 {5 U3 Z, ]uninsulated live part of film–coated wire that involves the risk of electric shock. The probe shall be applied
8 G. _) [9 V2 ^: r& o" o( ~in all possible articulated positions before, during, and after insertion.
# q, U' d9 F$ m7.11 An opening that has a minor dimension of 1 inch (25.4 mm) or more, in an enclosure, as illustrated
2 J# q) _8 M( |7 Din Figure 7.3, is acceptable if, within the enclosure, there is no uninsulated live part or film-coated wire
8 _$ L: L+ O4 e# f! e4 |less than;; d/ C* ~1 v1 G/ U5 D8 Z
a) R distance from the inside edge of the perimeter of the opening and/ p F, }* S& d1 V! g
b) X distance from the plane of the opening.
- h2 C; k( p: ], z- P* uT equals the enclosure thickness, R equals X minus T, and X equals 5 times the diameter of the largest. y5 w+ I4 ]0 L4 ] T' E& ~
round rod that can be inserted through the opening but not less than 6-1/16 inches (154 mm). In
. z0 W0 x3 z; Q. s2 ?evaluating an opening, any barrier located within the volume is to be ignored unless it intersects the+ _! {' Q8 S4 V1 `/ H
boundaries of the volume in a continuous, closed line.# t M2 o, ~ a: \! a* d" M+ ]" Y
/ x$ C8 C8 R2 a" o( z2 L7.11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?
% U$ O! D8 c* v5 |5 h这个范围是:A,从开口内边角算起的R距离间。R=外壳厚度+X2 N7 K- h2 ~ l9 Y- {
B,从开口平面算起的X距离间。X=MAX.(5*Rod直径,154mm) |
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