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fasten 发表于 2019-1-19 09:396 {; K' ?- Q6 O, ~$ T+ {- F
42.3 For an appliance using a cord swivel construction, the test described in 42.2 is to be conducte ...
B( s4 m2 `: X49.2 Each sample is to be mounted in a guide with a 1/4 pound (113 g) weight attached to the cord 8% K% ~+ t7 S" x1 A
inches (203 mm) from the cord entry hole so that the unit can be rotated 540 degrees about the axial! a9 O3 o7 d9 {8 f; L: T
center of the cord. A typical arrangement is shown in Figure 49.1. The rate of flexing is to be 10 cycles
$ V5 n" V6 n q; H g$ tper minute, where 1 cycle is equivalent to three complete rotations as defined in Note (a) of Table 49.1,7 p+ C# R" ]( P# D) p$ m
resulting in a rotational speed of 30 rotations per minute. During the test, the supply cord conductors of
/ P. l; i5 d% Ithe sample are to carry current equal to the current rating of the appliance at rated voltage. The ″as3 ~6 D4 ^% @: E4 O3 f
received″ samples are to be subjected to the number of cycles of flexing specified in Table 49.1. The$ @$ |1 O2 S+ l" `0 S1 @
conditioned samples of a hand-supported hair-drying appliance are to be subjected to 1,000 cycles of& C2 n! K7 G5 q. h' [
flexing.
0 z4 G0 X5 p5 ]% Q; U" t9 VException No. 1: With the concurrence of all concerned, the attached weight may be other than 1/4 pound,
% X* J, Y7 b+ D1 S `5 T$ Madjusted such that the cord is held taut and the intended flexing action is produced.
/ P' o9 K! ~5 ?Exception No. 2: With the concurrence of all concerned, the rate of rotation or cycle rate may be greater) O; _( m9 i" F- C
than specified4 j+ i# F- A6 {7 O: f
2 M: y3 x/ f% ~6 L3 d' [这里只是描述测试方法,没说转尾在线上吧? |
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