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fasten 发表于 2019-1-19 09:39
% j; p. H5 l U/ j- {# d42.3 For an appliance using a cord swivel construction, the test described in 42.2 is to be conducte ...
$ k; L4 m6 |: x: p0 X. g& e49.2 Each sample is to be mounted in a guide with a 1/4 pound (113 g) weight attached to the cord 8
; R3 H M! F; ]4 R, Z/ Iinches (203 mm) from the cord entry hole so that the unit can be rotated 540 degrees about the axial, m5 B# e8 g2 n& u. E8 R" H
center of the cord. A typical arrangement is shown in Figure 49.1. The rate of flexing is to be 10 cycles
! {5 Z9 @. e# H- }; p( _" |per minute, where 1 cycle is equivalent to three complete rotations as defined in Note (a) of Table 49.1,
4 V* }- s& h! m0 x4 a& @" ?, y( P2 xresulting in a rotational speed of 30 rotations per minute. During the test, the supply cord conductors of" }* X/ F8 e, H) k/ K0 q/ P. W" ?
the sample are to carry current equal to the current rating of the appliance at rated voltage. The ″as( D1 v4 Y" [. _. [+ ^
received″ samples are to be subjected to the number of cycles of flexing specified in Table 49.1. The7 z6 ^/ F, z5 j7 ^+ ~
conditioned samples of a hand-supported hair-drying appliance are to be subjected to 1,000 cycles of6 f3 o: s6 `; ? W6 }% T! r
flexing.
0 w \9 b; d+ ^6 r9 V- LException No. 1: With the concurrence of all concerned, the attached weight may be other than 1/4 pound,9 d# v" W9 _3 N& V0 `; O
adjusted such that the cord is held taut and the intended flexing action is produced.0 F! [- j$ O w& E2 h
Exception No. 2: With the concurrence of all concerned, the rate of rotation or cycle rate may be greater' Y5 Y) |/ w7 ^% {3 g* q( [& P
than specified; Q$ N c7 C% A
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这里只是描述测试方法,没说转尾在线上吧? |
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