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吊灯的负重测试与安装要求
/ W8 h# u0 i1 f4 u5 D, n4 s& J) N13.15.1. H. u) w/ Y& N5 o7 ?
A supporting device shall support for 1 hour a load equal to four times the total mass to be supported under intended operating conditions. Load shall be applied in the direction of actual loading conditions./ U+ B& R% H/ a W U
13.15.2, t! e1 l$ t7 M( M g
Where more than one support is provided, the load shall be distributed as follows:
& n( e/ t. r b; A( G( r* ~7 Z/ \a) where parts supported are no more than 11.3 kg (25 lb), full load shall be applied to each6 i4 }% S' y% `1 s
support; and+ P6 P% N5 l! d; S
b) where the parts supported are more than 11.3 kg (25 lb), the distribution of the load shall be7 i9 t1 z d1 `& H5 L
similar to that encountered in the field.
4 b. d% A1 m5 j/ K13.15.3
; V* `/ c) Q, }! B/ z+ sThere shall be no deflection or deformation either during or after loading that reduces electrical spacingsor compromises safety., w; l! ?* U- _9 ]. K* g4 R
所以对于一般的灯具,我们可用四倍的灯重来测试.如果产品超过11.3kg, 就要采用分散的多点负重来承重了. |
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