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6.14 Grounding and bonding% s! f+ S2 l/ [. y' C5 h6 Y
6.14.1 General7 t8 g) _" i) V6 M0 f' b9 |2 g& t
6.14.1.1 Non-current-carrying metal parts and metallized polymeric parts that are accessible during user+ U# X6 T4 f/ J9 O Q
maintenance or component replacement without the use of tools and that can involve the risk of shock; G& }* G4 r: E7 p" V( A, X
shall be bonded to ground and shall comply with the bond impedance test of Clause 17.2.
& C/ S7 [6 `- R7 f! n; D; B4 a6.14.1.2 The following parts are not required to be bonded to ground:
$ Q: j, Y% e! j+ g. u! d O(a) the links of a metal chain used to support a pendant luminaire;
; x e2 p0 w; \, P(b) accessible non-current-carrying metal parts of luminaire components (for example,8 ]8 f7 y& a+ q( \$ U
lampholders and switches) that are isolated from live parts; or
0 A* `" t1 f7 b* E3 t: [2 A: w(c) decorative parts, metal guards, and metal shades that do not enclose live parts.
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' c- f6 U9 ~9 G: l" w! F3 s个人觉得除非手能触及到的部分与产品载流部件之间符合双重绝缘或者加强绝缘的要求,否则接地是必须的. |
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