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fasten 发表于 2019-1-19 09:39
/ d0 X" ]& W& h42.3 For an appliance using a cord swivel construction, the test described in 42.2 is to be conducte ...
$ X/ a* f4 J4 Z4 {) r: z4 w49.2 Each sample is to be mounted in a guide with a 1/4 pound (113 g) weight attached to the cord 82 d) R/ c: I8 v, r8 { t
inches (203 mm) from the cord entry hole so that the unit can be rotated 540 degrees about the axial# c; j0 [$ s9 ^, K
center of the cord. A typical arrangement is shown in Figure 49.1. The rate of flexing is to be 10 cycles5 Z/ |! m# ?6 s. L
per minute, where 1 cycle is equivalent to three complete rotations as defined in Note (a) of Table 49.1,
0 Y; n: q; C' o( N2 ^2 r: Uresulting in a rotational speed of 30 rotations per minute. During the test, the supply cord conductors of
) m( u+ }" K7 ?5 S( Y, g8 Ithe sample are to carry current equal to the current rating of the appliance at rated voltage. The ″as
( v7 q$ |2 g2 n6 F8 A1 D( zreceived″ samples are to be subjected to the number of cycles of flexing specified in Table 49.1. The: B! W/ i# e$ E, ^' `! A0 V
conditioned samples of a hand-supported hair-drying appliance are to be subjected to 1,000 cycles of
" N& Y6 s: c+ V3 ]! R. {- xflexing.8 w# x5 S/ j" x3 l
Exception No. 1: With the concurrence of all concerned, the attached weight may be other than 1/4 pound,
7 V8 `2 ]. k' M0 y/ Iadjusted such that the cord is held taut and the intended flexing action is produced.7 J8 j% H; n+ d* `( K. V, u; w! m
Exception No. 2: With the concurrence of all concerned, the rate of rotation or cycle rate may be greater% G1 t. T3 Q+ s. e& r
than specified
- z8 X& d+ _/ o4 Z! y3 Y% R$ y' z& S8 c) `: p. v
这里只是描述测试方法，没说转尾在线上吧？ |
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发表于 2019-1-19 09:39
