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各位大神,
; D" U, ]: q+ E* z6 `2 t8 c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。) Q" P/ \4 e8 @
24 Electrical Spacings
$ O5 M Q3 l- F4 l24.1 The spacing between uninsulated live parts of opposite polarity, and between uninsulated live parts
8 m- ?2 ]) O8 j% z4 f6 ]* z$ n4 Wand metal that is capable of being grounded shall not be less than 1/4 inch (6.4 mm) through air or 3/8
1 Y$ _/ |5 }) i' J3 Y) }/ ?( G/ Zinch (9.5 mm) over surface. The outer wrap of an open core and coil ballast is determined to be an
- F' x% G) J3 \7 x6 Luninsulated live part with respect to this requirement.
6 D. ~% F# u4 G) z% d% K; d$ WException No. 1: The spacing requirements do not apply between uninsulated live parts of a wiring device,
3 W3 R4 b* F6 m2 y4 Csuch as a lampholder or switch, and dead metal that is part of the wiring device and including mounting1 j% ]3 K6 {, ?' N$ J, _: ^
screws, rivets, yoke, clamp, or similar components; or for a portable luminaire provided with a grounding
" X# s* R$ W5 l0 {( umeans between such live parts and that part of the dead metal surface of the portable luminaire on which3 \, t; T& }8 `7 }0 V: _! i
the device is mounted in its intended manner. See Figure 24.1./ A6 r1 ]$ g% f- N; i, S0 H
h* T, J, p: H9 QA. Uninsulated live parts of wiring device.
- y" G+ X% B' {& W6 PB. Insulating material of wiring device.6 w! M6 H7 T0 Q4 I2 ~
C. Mounting screw of wiring device.
2 x' S6 _, N5 cD. Dead metal part of wiring device./ }; o" p$ }+ H' ?- o
E. Dead metal parts of portable luminaire.. E9 S4 \0 g4 J9 r# j! R* Q6 Y" x& D
F. Spacings to which 24.1 applies.
8 ]4 P: s5 r$ l$ h! tG. Spacings to which 24.1 does not apply. See Exception No. 1 to 24.1.
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