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fasten 发表于 2019-1-19 09:39* _% s4 ?3 j* T4 b# p
42.3 For an appliance using a cord swivel construction, the test described in 42.2 is to be conducte ... 2 e3 o6 |9 e2 z; X
49.2 Each sample is to be mounted in a guide with a 1/4 pound (113 g) weight attached to the cord 8
' j. `5 X8 w; B1 O+ z$ iinches (203 mm) from the cord entry hole so that the unit can be rotated 540 degrees about the axial5 s6 f- B4 c9 O9 q* N* S
center of the cord. A typical arrangement is shown in Figure 49.1. The rate of flexing is to be 10 cycles; I9 S! v, }9 N2 S5 o% g: a
per minute, where 1 cycle is equivalent to three complete rotations as defined in Note (a) of Table 49.1,
; r9 j1 ?/ g" ? n, p! Xresulting in a rotational speed of 30 rotations per minute. During the test, the supply cord conductors of
\, E5 j- D4 l! K- z- wthe sample are to carry current equal to the current rating of the appliance at rated voltage. The ″as
L8 C8 c/ ?$ @% Oreceived″ samples are to be subjected to the number of cycles of flexing specified in Table 49.1. The
+ y* o3 T2 S& S3 ]$ n; q0 jconditioned samples of a hand-supported hair-drying appliance are to be subjected to 1,000 cycles of. J% X$ }' I7 T0 s: d
flexing.2 f% N3 j o( M) y0 U
Exception No. 1: With the concurrence of all concerned, the attached weight may be other than 1/4 pound,8 p* q7 d1 H* |, |6 n# R+ R$ p
adjusted such that the cord is held taut and the intended flexing action is produced.
3 s# a7 }# \( [2 W( B; ^' ~* a, nException No. 2: With the concurrence of all concerned, the rate of rotation or cycle rate may be greater
: J" p# g) Q" l: Hthan specified5 `3 c' n) A( W7 `0 f
' ?) E) G8 F& ]8 a& }9 F; k+ v这里只是描述测试方法,没说转尾在线上吧? |
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