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各位大神,
5 d0 h0 Y! p7 X9 {0 ~. {请看附图标注"G"的位置,为什么“G” 位置的电气间隙24.1不适用?难道是不用测电气间隙不成。
: T7 l8 H7 Z: k& w7 a3 W- h. E24 Electrical Spacings, |- E% i0 Q. w3 ^4 j
24.1 The spacing between uninsulated live parts of opposite polarity, and between uninsulated live parts
# N0 W# N4 V3 |$ kand metal that is capable of being grounded shall not be less than 1/4 inch (6.4 mm) through air or 3/8! @: U4 n+ `; ]9 Q
inch (9.5 mm) over surface. The outer wrap of an open core and coil ballast is determined to be an- g+ f8 S( Z& K& \. k; n6 P
uninsulated live part with respect to this requirement.
9 \; w$ D2 ]3 q6 j( s+ V/ x1 QException No. 1: The spacing requirements do not apply between uninsulated live parts of a wiring device,+ _- j. ^5 \2 @. o: P
such as a lampholder or switch, and dead metal that is part of the wiring device and including mounting
9 N/ T1 Q& N& ~$ e) j: escrews, rivets, yoke, clamp, or similar components; or for a portable luminaire provided with a grounding
/ V% K$ F( w# ^& Y% K( J: ]# U& Jmeans between such live parts and that part of the dead metal surface of the portable luminaire on which
3 H) Z; @( `) f8 Ithe device is mounted in its intended manner. See Figure 24.1.
& z9 h4 i8 u% w1 c9 m; @3 S! f* n! j! }7 {' W
A. Uninsulated live parts of wiring device.
2 O. K, {0 c' w" C/ z; KB. Insulating material of wiring device.0 K& c; j% g5 k- I+ U9 {
C. Mounting screw of wiring device.0 M* t- W9 { }& |& \% f' o+ n: ]( e
D. Dead metal part of wiring device.
' H. u, V1 [& @* M. \9 pE. Dead metal parts of portable luminaire.0 _% |! Q3 h: F. a
F. Spacings to which 24.1 applies.3 a. o$ X) h' `
G. Spacings to which 24.1 does not apply. See Exception No. 1 to 24.1.& e+ U1 i+ x2 ]
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