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各位大神,
c' H) L/ U! ]' ?$ |0 q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。4 i p7 j* d& e: D: }, n
24 Electrical Spacings, f9 R/ a% M# a0 R
24.1 The spacing between uninsulated live parts of opposite polarity, and between uninsulated live parts+ l* U# w3 N1 a- I
and metal that is capable of being grounded shall not be less than 1/4 inch (6.4 mm) through air or 3/81 L4 m$ V1 P1 \
inch (9.5 mm) over surface. The outer wrap of an open core and coil ballast is determined to be an* ?- g i) W0 J% w. O$ B) B* K
uninsulated live part with respect to this requirement.( ^3 [3 U6 q/ Y7 S- {
Exception No. 1: The spacing requirements do not apply between uninsulated live parts of a wiring device,0 W9 Q! q @" X# o% [: e3 D. O; `
such as a lampholder or switch, and dead metal that is part of the wiring device and including mounting* X4 S: @: C, k- ]2 h
screws, rivets, yoke, clamp, or similar components; or for a portable luminaire provided with a grounding4 g* j2 O( D3 {! q! }! W) b
means between such live parts and that part of the dead metal surface of the portable luminaire on which8 g7 @% e E9 m% \
the device is mounted in its intended manner. See Figure 24.1.+ ~, `) H3 o5 M* B& l
3 i7 Q% m4 v+ D# g
A. Uninsulated live parts of wiring device.
. |/ f+ P K9 N/ gB. Insulating material of wiring device.+ k- q, t0 g% G% j" T% [
C. Mounting screw of wiring device.% k+ s: Y8 t! \1 m5 A
D. Dead metal part of wiring device.6 h+ ^; w0 b+ c2 K$ A
E. Dead metal parts of portable luminaire.
n. P+ V/ H9 L2 tF. Spacings to which 24.1 applies.
' }& L0 B! v8 R+ J$ k2 k) m: QG. Spacings to which 24.1 does not apply. See Exception No. 1 to 24.1.2 O! Y9 i' I: T# W8 I; T
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