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fasten 发表于 2019-1-19 09:39
( J+ N4 P' D' V8 B: ~) N, E42.3 For an appliance using a cord swivel construction, the test described in 42.2 is to be conducte ... 3 t) s! P% @1 D9 X- ?- ]* c
49.2 Each sample is to be mounted in a guide with a 1/4 pound (113 g) weight attached to the cord 89 k K. h+ Z' x# G+ P
inches (203 mm) from the cord entry hole so that the unit can be rotated 540 degrees about the axial
. N9 K* g6 R& l d. c6 D/ Acenter of the cord. A typical arrangement is shown in Figure 49.1. The rate of flexing is to be 10 cycles
! D& Z; s; H H7 S3 q3 }3 c8 Lper minute, where 1 cycle is equivalent to three complete rotations as defined in Note (a) of Table 49.1,
( s0 w! \$ S% \$ z! [% `( S% xresulting in a rotational speed of 30 rotations per minute. During the test, the supply cord conductors of
+ x/ i* t. z- `- a) fthe sample are to carry current equal to the current rating of the appliance at rated voltage. The ″as
: H7 V7 `5 J O! k0 Dreceived″ samples are to be subjected to the number of cycles of flexing specified in Table 49.1. The R+ |% C7 v0 Y2 S8 B) Q* y
conditioned samples of a hand-supported hair-drying appliance are to be subjected to 1,000 cycles of# d& C3 L q3 m/ t5 C( A7 u
flexing.
2 |' A1 }4 p; `1 a7 YException No. 1: With the concurrence of all concerned, the attached weight may be other than 1/4 pound,
6 w/ r3 H2 Q4 }5 J( madjusted such that the cord is held taut and the intended flexing action is produced.
$ |3 ]8 u4 }; D8 Z7 P4 c& b0 Q# [Exception No. 2: With the concurrence of all concerned, the rate of rotation or cycle rate may be greater0 G& P* b9 ]* A2 u* ]; h" n
than specified& \; k8 k. K$ n2 b; S# t ^
& I7 c7 g8 z! y! ?& C
这里只是描述测试方法,没说转尾在线上吧? |
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