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请参考4.14.2 The mass of the luminaire suspended by flexible cables or cords shall not exceed 5 kg.
" h; j+ @' D8 u4 s! a" GThe total nominal cross-sectional area of the conductors of flexible cables or cords suspending# f' K" u3 ~. L0 \1 p3 h' m/ G7 R
pendants shall be such that the stress in the conductors does not exceed 15 N/mm2.7 |3 W6 S# _0 U8 M) ^
For the calculation of the stress, only the conductors are considered.+ a7 } Q+ A9 M3 n; e/ G# C9 d
Where a luminaire of mass greater than 5 kg is intended to be suspended, the design of the4 A( e3 w; Q0 L: z: ?) ~# L
luminaire or of the flexible cable or cord shall be such as to prevent any tension being applied
) F4 o. T) ?3 b6 T" Lto the conductors.
- ?" I: L& Q8 X% O% E2 @, INOTE 1 This requirement can be met by using a cable which incorporates suitable load-carrying cores. |
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