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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 acceptable8 S+ U9 t9 y) g9 E5 ?# Y p- T- x$ j
if a probe as illustrated in Figure 7.2, inserted through the opening, cannot be made to touch any
; w* u) Z/ W0 V9 y: quninsulated live part of film–coated wire that involves the risk of electric shock. The probe shall be applied
# P. d7 d8 N* e7 E: u/ v! S0 z% D+ kin all possible articulated positions before, during, and after insertion.3 V, W: p7 z4 V j6 @$ y- X
7.11 An opening that has a minor dimension of 1 inch (25.4 mm) or more, in an enclosure, as illustrated5 T/ O0 }# }% d! R. O7 @# r
in Figure 7.3, is acceptable if, within the enclosure, there is no uninsulated live part or film-coated wire, W4 {2 R* W3 M9 v+ t
less than;* @1 \. L5 i3 l2 k& n' e
a) R distance from the inside edge of the perimeter of the opening and
( t' X6 S9 g" O1 tb) X distance from the plane of the opening.' M# ^9 M: q) B7 z' T# P
T equals the enclosure thickness, R equals X minus T, and X equals 5 times the diameter of the largest
# K( S' Q+ x- g3 [. pround rod that can be inserted through the opening but not less than 6-1/16 inches (154 mm). In& B5 D$ X3 f* R6 ]) j" Z# ~% g
evaluating an opening, any barrier located within the volume is to be ignored unless it intersects the. Y$ c p; Y& X6 L
boundaries of the volume in a continuous, closed line.
' h* @! B, ^7 g6 `9 G8 f4 G( u* _# y4 Y: v6 A, c
7.11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?
9 {% o( z1 h3 g# V# S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, a2 B0 p5 P% ?' O
B,从开口平面算起的X距离间。X=MAX.(5*Rod直径,154mm) |
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