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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.* {- r3 s# Y9 R* c! A3 c' l- [! g
The total nominal cross-sectional area of the conductors of flexible cables or cords suspending6 {; F) x+ L# O( ], i+ B( B
pendants shall be such that the stress in the conductors does not exceed 15 N/mm2.
, [+ T8 N' i4 s3 f# V, Z' B8 XFor the calculation of the stress, only the conductors are considered.6 ^ a4 x, @ _( B
Where a luminaire of mass greater than 5 kg is intended to be suspended, the design of the9 J$ d% H1 o+ a* d- X6 Y: d8 z
luminaire or of the flexible cable or cord shall be such as to prevent any tension being applied1 I4 @! M8 i! _, M6 u6 n: m
to the conductors.
5 k" \; w( C6 f% w/ R' uNOTE 1 This requirement can be met by using a cable which incorporates suitable load-carrying cores. |
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