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UL 1598里面有专门的规定! o0 w: J3 p' q' g" H0 n
- D' L0 q( c/ g& u( K4 @吊重的要求, V2 j$ D: |3 \- s! r
16.15 Loading
" d, H3 `5 d1 @! O7 X/ v16.15.1 A supporting device shall support a load equal to four times the total mass to be supported under
4 i+ X8 E' x4 t" i8 c# O7 Sintended operating conditions for 1 h. The load shall be applied in the direction of actual loading
1 `% I0 ?3 R9 e; \) u) {. O8 Tconditions.
) R0 n6 D7 T+ j3 g2 G16.15.2 Where more than one support is provided, the load shall be distributed as follows:
2 T. f/ e: \9 N- S7 W, D(a) where the parts supported are no more than 11.3 kg (25 lb), the full load shall be applied to9 B9 W, b3 f2 u7 Y3 N
each support; or1 [+ _6 A! \. B; Q3 R0 [- v
(b) where the parts supported are more than 11.3 kg (25 lb), the distribution of the load shall2 a) A7 C. g& q2 O4 \
be similar to that encountered in the field.
$ {8 [2 M! j8 w% B; _5 V16.15.3 There shall be no deflection or deformation either during or after loading that reduces electrical6 D6 H8 D4 R5 v- l
spacings or compromises safety.4 ^ D2 l; B$ f, U1 {- r
' V s7 N2 s; \额外的支承措施要求
; {" l. R A$ B, u5 O10.2.5 A luminaire, including lamps, shall be provided with means of support independent of the outlet- e0 ]+ l. p: i: d7 }
box and shall be marked and provided with installation instructions in accordance with Table 20.1.1, Items
* ?, }; j8 a. a. s0 Y; S% [1.21 and 1.33, if it is:# o! U* \. R0 [! G# G [
(a) a ceiling surface type and weighs more than 22.7 kg (50 lb); or) q4 a+ c: C, @; i
(b) a surface wall-mounted type and weighs more than 11.4 kg (25 lb). |
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