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fasten 发表于 2019-1-19 09:39
: R& C9 j+ D& E+ z9 U9 ~( D42.3 For an appliance using a cord swivel construction, the test described in 42.2 is to be conducte ... 7 S9 H5 f8 c1 S0 M
49.2 Each sample is to be mounted in a guide with a 1/4 pound (113 g) weight attached to the cord 8
( r o( p! @5 ]' a0 Qinches (203 mm) from the cord entry hole so that the unit can be rotated 540 degrees about the axial
* q3 |, A6 @% [6 z |5 Pcenter of the cord. A typical arrangement is shown in Figure 49.1. The rate of flexing is to be 10 cycles" m ` F2 |& p/ H* G/ I) u) c
per minute, where 1 cycle is equivalent to three complete rotations as defined in Note (a) of Table 49.1,
! Q2 M4 N _- G4 ]- gresulting in a rotational speed of 30 rotations per minute. During the test, the supply cord conductors of
P& _4 e7 V9 R+ E2 j2 ?4 b1 P5 v% ]the sample are to carry current equal to the current rating of the appliance at rated voltage. The ″as
% P" e+ b9 T" C/ O7 r0 kreceived″ samples are to be subjected to the number of cycles of flexing specified in Table 49.1. The
* _) k4 i& n* U( U% l+ [* Cconditioned samples of a hand-supported hair-drying appliance are to be subjected to 1,000 cycles of4 H* R5 F: b: ]" g! t# h1 n7 c
flexing.6 M' H5 v2 u# c) j" M/ S
Exception No. 1: With the concurrence of all concerned, the attached weight may be other than 1/4 pound,
/ B/ W, [- S* X! F. z0 D2 q+ iadjusted such that the cord is held taut and the intended flexing action is produced.) z9 G+ U6 R2 W" l
Exception No. 2: With the concurrence of all concerned, the rate of rotation or cycle rate may be greater
/ Y6 ~) v \! Z% b& z9 Y' B! ithan specified
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+ _8 }) a) e& B# K; H这里只是描述测试方法,没说转尾在线上吧? |
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