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UL 1598里面有专门的规定
$ M" A% d3 Q5 Z+ U& h, q: w( t$ G/ E) b8 q: B% u n2 i1 a. R8 N& a
吊重的要求
9 b' c' [4 F) @% N1 m16.15 Loading# @' N D6 \0 n4 y3 V9 K
16.15.1 A supporting device shall support a load equal to four times the total mass to be supported under9 C5 h0 w8 `! k+ r) s) i
intended operating conditions for 1 h. The load shall be applied in the direction of actual loading% ], ?- e' k, Q0 O
conditions.
. ]5 a8 u. Z- c% j16.15.2 Where more than one support is provided, the load shall be distributed as follows:
7 Z5 l" v) a4 K8 [5 J(a) where the parts supported are no more than 11.3 kg (25 lb), the full load shall be applied to
# }( ^, c7 w g+ Qeach support; or
( ^: D4 ^6 {* ~9 x3 f' k(b) where the parts supported are more than 11.3 kg (25 lb), the distribution of the load shall! c" w5 t$ R& Y0 u( I1 M7 @
be similar to that encountered in the field.
0 G- K3 l9 j4 K: x! L b5 i- H16.15.3 There shall be no deflection or deformation either during or after loading that reduces electrical
- d: ~$ m! r2 i' _. uspacings or compromises safety.
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额外的支承措施要求& V" n, Q7 H8 ?9 x
10.2.5 A luminaire, including lamps, shall be provided with means of support independent of the outlet4 A# K- L0 q/ g A7 S& H
box and shall be marked and provided with installation instructions in accordance with Table 20.1.1, Items
/ H1 K2 F6 {4 e( m( Q) P1.21 and 1.33, if it is:8 Q2 w, E8 M) {/ k: _
(a) a ceiling surface type and weighs more than 22.7 kg (50 lb); or
& t- O2 K4 l {3 @7 O; g# T(b) a surface wall-mounted type and weighs more than 11.4 kg (25 lb). |
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