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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.9 S, {; a& w7 e6 a a& A
The total nominal cross-sectional area of the conductors of flexible cables or cords suspending
/ t9 P( f4 X9 H! xpendants shall be such that the stress in the conductors does not exceed 15 N/mm2.3 Q$ y6 }1 V U+ ^* H
For the calculation of the stress, only the conductors are considered.6 H) a- z- O- E' y
Where a luminaire of mass greater than 5 kg is intended to be suspended, the design of the
9 U! a0 l% C. j8 K& e! j5 Jluminaire or of the flexible cable or cord shall be such as to prevent any tension being applied' H/ k2 z% d# w
to the conductors.
: T% z h- J: D7 J+ MNOTE 1 This requirement can be met by using a cable which incorporates suitable load-carrying cores. |
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