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请查看UL1278标准：
0 h) _* [: z. u3 @1 a& D16.4.1 A power supply cord supplied as part of an appliance as described in Table 16.1, row 1 must, `$ W% |) i. i1 P, _! t8 g" }3 g
additionally be subjected to the performance test requirements of Sections 59A – 59D.而经过59A-59D测试的电源线厂家会标识上-R,所以Household Heater 出美国是有要求的；7 F# r1 o7 Y! D! M9 o- H* O
) S0 p; H6 D, T5 N! k. I7 v V8 E请查看红色部分，测试次数取决于产品的摇头机构：( A5 }3 n4 U& F
42.2.2 The endurance test required by 42.2.1 is to consist of:
! U2 G, C5 d, A( i% @a) 750,000 cycles of operation for an air heater in which the movement of the power-supply4 k5 d$ B# I$ x9 |5 p
cord, electrical wiring or other insulated live parts occurs as a result of the operation of an, ?3 k; R$ x# a2 `& W' q- s) s
automatic mechanical feature, such as a motorized base not prohibited from being separately* \4 e" x t8 }1 Y5 D2 u
activated; or' b% o& h2 X) E9 r
b) 6000 cycles of operation for an air heater in which the movement of the power-supply cord,- x, s; p& F- S2 ~1 l/ f2 p
electrical wiring or other insulated live parts occurs only as a result of the operation of a manual4 N5 {* @$ a9 @: g6 _9 x, \
feature, such as a swivel base that requires a user to manipulate the air heater.
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