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UL 1598里面有专门的规定
/ A( Z* q) t. \+ L( n, I7 w9 D( a; I' F" u3 Y
吊重的要求
0 V1 Y8 t3 K/ m16.15 Loading* D/ [$ J# v$ ]9 {3 w* w5 l
16.15.1 A supporting device shall support a load equal to four times the total mass to be supported under' |( ] j3 T& O( ?
intended operating conditions for 1 h. The load shall be applied in the direction of actual loading c0 s2 G# F7 B/ X0 ?
conditions.
1 x2 A4 u8 `* P% T4 ^/ Y6 }* c16.15.2 Where more than one support is provided, the load shall be distributed as follows:3 m$ }- m9 G$ @1 _! q( I
(a) where the parts supported are no more than 11.3 kg (25 lb), the full load shall be applied to
% l& v+ k; J( L0 H% o" Ieach support; or+ M8 e) F5 K9 T: ]+ k
(b) where the parts supported are more than 11.3 kg (25 lb), the distribution of the load shall/ T2 U0 o+ J' \, r5 L2 ~
be similar to that encountered in the field.
% `- V5 G, Z% _/ l16.15.3 There shall be no deflection or deformation either during or after loading that reduces electrical
; |! c2 L( m$ [; U; Q. P1 wspacings or compromises safety.: H, G5 }8 S9 o
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额外的支承措施要求
- D/ Z! }4 N- f: o10.2.5 A luminaire, including lamps, shall be provided with means of support independent of the outlet
9 F, S: y9 M% nbox and shall be marked and provided with installation instructions in accordance with Table 20.1.1, Items
) u( K/ w! H- m& t5 K1.21 and 1.33, if it is:5 `3 ^2 S6 l( I
(a) a ceiling surface type and weighs more than 22.7 kg (50 lb); or
* A& {( w$ x9 }. G& e(b) a surface wall-mounted type and weighs more than 11.4 kg (25 lb). |
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发表于 2007-6-17 20:03
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