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UL 1598里面有专门的规定: y' u! S: g/ y6 [$ `" Y
; h5 T. C E/ e) Z
吊重的要求
* L0 l$ l6 W6 z: L16.15 Loading
6 h4 C0 ]( w8 W% `" u6 o16.15.1 A supporting device shall support a load equal to four times the total mass to be supported under) B9 d5 T' g9 K. O5 M5 k
intended operating conditions for 1 h. The load shall be applied in the direction of actual loading
" X' y& R+ j. uconditions.
* _$ N5 ^* \& ~$ y- t# b16.15.2 Where more than one support is provided, the load shall be distributed as follows:
. U/ j( `4 F* F( d8 ~+ [. y/ {/ _8 }(a) where the parts supported are no more than 11.3 kg (25 lb), the full load shall be applied to- d( A1 X. A1 G
each support; or
: J$ M0 ~- }+ F* l% h(b) where the parts supported are more than 11.3 kg (25 lb), the distribution of the load shall8 J/ ^# v4 }: A( c1 x& T: S
be similar to that encountered in the field.
; O! A0 y! v6 T9 e* b. V6 ^16.15.3 There shall be no deflection or deformation either during or after loading that reduces electrical! W, P. ?! w6 L7 v. V
spacings or compromises safety.
9 G; b- I! i: v1 {
, S2 v7 R7 o1 k0 o额外的支承措施要求8 b" H7 v& b- l
10.2.5 A luminaire, including lamps, shall be provided with means of support independent of the outlet
8 _/ p5 O+ Q. \/ Nbox and shall be marked and provided with installation instructions in accordance with Table 20.1.1, Items
# A6 }% ? ~: q' H6 T" y S1.21 and 1.33, if it is:
0 Y; r: _* |& g. P& D(a) a ceiling surface type and weighs more than 22.7 kg (50 lb); or
; z# }# L1 @, R* n) Z! `: H(b) a surface wall-mounted type and weighs more than 11.4 kg (25 lb). |
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