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fasten 发表于 2019-1-19 09:39
0 ~" k" [6 R H* s9 o2 X42.3 For an appliance using a cord swivel construction, the test described in 42.2 is to be conducte ... ( u6 }# ]7 ]/ i8 P$ i" C- i/ i* u: t. \
49.2 Each sample is to be mounted in a guide with a 1/4 pound (113 g) weight attached to the cord 8
% B3 M' U5 p2 N* U( W5 @inches (203 mm) from the cord entry hole so that the unit can be rotated 540 degrees about the axial
6 {/ c L6 B9 e3 T4 N! pcenter of the cord. A typical arrangement is shown in Figure 49.1. The rate of flexing is to be 10 cycles
- p" U1 i9 l( L! s$ U" y% ?per minute, where 1 cycle is equivalent to three complete rotations as defined in Note (a) of Table 49.1,
$ b3 ?# C; Q3 A: A zresulting in a rotational speed of 30 rotations per minute. During the test, the supply cord conductors of& g: X' }6 ]. F
the sample are to carry current equal to the current rating of the appliance at rated voltage. The ″as' U d3 m( E" t( o- n' D
received″ samples are to be subjected to the number of cycles of flexing specified in Table 49.1. The
' @# w& ~$ B& x7 d' j" n* Jconditioned samples of a hand-supported hair-drying appliance are to be subjected to 1,000 cycles of+ v; S% u% `, Y! F
flexing.5 Y( Y) J! ^, ?* t1 o
Exception No. 1: With the concurrence of all concerned, the attached weight may be other than 1/4 pound,
2 Y: e: w9 ?0 p4 iadjusted such that the cord is held taut and the intended flexing action is produced.
P/ h7 ?1 G6 |. s9 fException No. 2: With the concurrence of all concerned, the rate of rotation or cycle rate may be greater8 X3 q. _8 C. F& C1 [
than specified
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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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