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各位大神，$ w1 X7 K. I5 i
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。 $ N/ B9 W( M& Z5 p
24 Electrical Spacings5 p: C8 q. [4 t$ J" }
24.1 The spacing between uninsulated live parts of opposite polarity, and between uninsulated live parts
) U/ L2 Z0 c/ a0 X- O3 H; aand metal that is capable of being grounded shall not be less than 1/4 inch (6.4 mm) through air or 3/8
( w n9 f; I6 r/ Y1 E% s+ sinch (9.5 mm) over surface. The outer wrap of an open core and coil ballast is determined to be an
' z0 _& [3 N3 y6 n9 muninsulated live part with respect to this requirement.; k) i% ^7 p: p; \' m
Exception No. 1: The spacing requirements do not apply between uninsulated live parts of a wiring device,8 y! n9 v/ Y9 y% @
such as a lampholder or switch, and dead metal that is part of the wiring device and including mounting
- i6 j" l& c; V1 Z3 [. _screws, rivets, yoke, clamp, or similar components; or for a portable luminaire provided with a grounding
7 y4 o' u n; B# N9 Pmeans between such live parts and that part of the dead metal surface of the portable luminaire on which
5 M# d( T' W- ~, a3 Othe device is mounted in its intended manner. See Figure 24.1./ {% j2 b+ R7 B1 W; A4 ^- Y% S
0 F: x; b6 H- b$ ^3 u6 q4 K) E8 N$ T
A. Uninsulated live parts of wiring device.% a$ l# i6 l1 V) W- i4 g
B. Insulating material of wiring device.9 h* X/ _7 q+ G. x5 z3 P" p
C. Mounting screw of wiring device.0 I/ X' o$ K) T( F7 y5 e+ S
D. Dead metal part of wiring device. A! \' F/ f8 J( c
E. Dead metal parts of portable luminaire.7 |: Z8 a; {' y7 O! Z \
F. Spacings to which 24.1 applies.
h' l5 E# L, [. DG. Spacings to which 24.1 does not apply. See Exception No. 1 to 24.1.; B( Z8 c$ K' A! _4 a
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发表于 2014-1-20 15:42
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