美国电动类厨房电器安全标准的基本要求-ul982.ppt

Instruction and marking Marking (cont’d) Caution markings intended to inform the user of a potential risk of injury to persons shall be prefixed by the signal word CAUTION. The signal word shall be more prominent than any other required marking on the appliance. Exception: WARNING shall be used as the signal word for the marking stated in 66.18 and 66.25. Lettering height 字高要求 In letters not less than 2.4 mm; or 如果字和底的颜色差异较大,则可以减少到1.6 mm. MANUFACTURING AND PRODUCTION TESTS Dielectric Voltage-Withstand Test The production-line test shall be conducted in accordance with either Condition A or Condition B of Table 61.1. Exception: For an electric knife or wand-type mixer the test potential shall be 2500 V applied for one minute, or3000 V applied for one second. The appliance may be in a heated or unheated condition for the test. MANUFACTURING AND PRODUCTION TESTS Grounding Continuity Test Each cord-connected appliance having provision for grounding shall be tested, as a routine production-line test, to determine grounding continuity between the grounding blade of the attachment plug and the accessible metal parts of the appliance that are likely to become energized. Only a single test need be made if the accessible metal selected is conductively connected by design to all other accessible metal. The grounding resistance shall be less than 0.1Ω. MANUFACTURING AND PRODUCTION TESTS Polarization Test As a routine production-line verification, each cord-connected appliance provided with a 2-wire polarized or 3-wire grounding attachment plug, shall be examined or tested for electrical continuity between the ungrounded circuit supply conductor of the attachment plug (see Figure 11.1 for attachment plug blade connections) and all components intended to be connected to the ungrounded conductor. If the continuity cannot be readily determined by visual inspection and component checking, an electrical continuity test is to be conducted. Common failure Flooding of