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吊灯的负重测试与安装要求7 K. G: ?, r. `3 X+ |3 J r7 I
13.15.16 w0 Q1 N: k: D D
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.
% F9 G) {% T* ]# Q13.15.2& G0 s" v- X& o! ]/ ]# T g( x* N
Where more than one support is provided, the load shall be distributed as follows:
9 R" U2 G" o* z. P0 E& Oa) where parts supported are no more than 11.3 kg (25 lb), full load shall be applied to each
7 I O l* I% Q8 J" D1 xsupport; and
3 l) p' D# b! _# h* @, e7 t7 lb) where the parts supported are more than 11.3 kg (25 lb), the distribution of the load shall be
* o* p& g+ l- M9 c a* i# Nsimilar to that encountered in the field.
0 o2 U" h* y; _5 N8 o0 {13.15.32 p% I8 Z! y' n+ [; T
There shall be no deflection or deformation either during or after loading that reduces electrical spacingsor compromises safety.9 F9 O- L3 C% c4 |' W
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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发表于 2008-3-4 15:36
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