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吊灯的负重测试与安装要求
0 M. @1 {/ k, r13.15.1& l; E* ?+ k) x1 B( l" X
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.
( L: [- e& Q( C( G' G7 D( [( G13.15.2
, z2 `3 R5 {! uWhere more than one support is provided, the load shall be distributed as follows:3 |. u$ U2 Q0 H! h' [
a) where parts supported are no more than 11.3 kg (25 lb), full load shall be applied to each
, y& I% X4 h6 n- `8 E# I4 E6 fsupport; and+ J) H {- f# }$ C9 q
b) where the parts supported are more than 11.3 kg (25 lb), the distribution of the load shall be
# \) I) Y* u Y0 w8 {- n3 V2 ?+ n, Osimilar to that encountered in the field.) e& Q' `' l1 V9 l6 j
13.15.3
B5 i1 V* G& W- m x& VThere shall be no deflection or deformation either during or after loading that reduces electrical spacingsor compromises safety.; s/ f! K& }7 |0 m
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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