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各位大神,
" S% R+ |8 } \" O: V! t7 G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。
% W3 \: Q+ ], @8 c/ U% f+ _24 Electrical Spacings
8 {9 s; n5 R, j24.1 The spacing between uninsulated live parts of opposite polarity, and between uninsulated live parts
( ?4 b! b, R, k! H% nand metal that is capable of being grounded shall not be less than 1/4 inch (6.4 mm) through air or 3/8
$ `# Q7 A) y7 _6 Q oinch (9.5 mm) over surface. The outer wrap of an open core and coil ballast is determined to be an; ~( V# R# w' j
uninsulated live part with respect to this requirement.& t$ `) O9 w/ \6 `& |, B
Exception No. 1: The spacing requirements do not apply between uninsulated live parts of a wiring device,
\/ R$ B3 p7 C6 F ysuch as a lampholder or switch, and dead metal that is part of the wiring device and including mounting' @) I% w, \ Q2 f
screws, rivets, yoke, clamp, or similar components; or for a portable luminaire provided with a grounding
. p; i1 v0 h9 N$ vmeans between such live parts and that part of the dead metal surface of the portable luminaire on which
6 u# M6 y6 d" A5 Q: dthe device is mounted in its intended manner. See Figure 24.1.5 c# a5 v7 |. m1 ?
! F+ }( b8 |. SA. Uninsulated live parts of wiring device.% e a3 v: ^0 `2 `$ P" V; f
B. Insulating material of wiring device./ q* \: N* d- W* B# k8 A ]
C. Mounting screw of wiring device.
' [7 W; c/ P8 N' f9 jD. Dead metal part of wiring device.- `# ]8 e! s/ A3 O. r4 o
E. Dead metal parts of portable luminaire.' L4 Y* T2 M+ a8 Q* P
F. Spacings to which 24.1 applies.- z& m7 I0 w8 q
G. Spacings to which 24.1 does not apply. See Exception No. 1 to 24.1.
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