5.3 Polymeric materials
5.3.1 In Canada, a polymeric material shall comply with the requirements in CAN/CSA-C22.2 No. 0.17and with the requirements of Clauses 5.3.2 to 5.3.4 and Clause 5.3.6 when the material is used to:a) Enclose electrical parts, 电气封装部件
b) Provide direct or indirect support of live parts, 对带电部件提供直接或间接额定支持
c) Both.
In Mexico, the parts of insulating material that contain live parts and external parts of insulating material that provide protection against electrical shock shall be subjected to the glow-wire test in accordance with NMX-J-565/2-11-ANCE and to the following: 墨西哥，灼热丝测试；
a) The test specimen shall be an end product. If it is necessary to take a part from the lamp inorder to perform the test, care shall be taken to assure that the test conditions are not significantly different from that which occurs in normal use conditions;
b) The temperature in the tip of the glow-wire shall be 650 °C. 灼热丝尖端的温度应为650℃；
In the United States, a polymeric material shall comply with the requirements for portable equipment specified in UL 746C and with the requirements of Clauses 5.3.2 to 5.3.6 when the material is used to: 美国，聚合物高分子材料应符合UL 746C规定的便携式设备的要求，并符合条款5.3.2至5.3.6的要求；
a) Enclose electrical parts,
b) Provide direct or indirect support of live parts, or
c) Both.
5.3.2 A polymeric material used to enclose electrical parts shall have a Relative Thermal Index (RTI),including electrical and mechanical, with impact properties of at least the temperature measured during the temperature test of Clause 8.5, unless the measured temperature is less than 65 °C. 封装电气部件的高分子材料应有相对热指数
5.3.3 A polymeric material used as an enclosure shall have a flammability rating of 5-VA, 5-VB, or V-0 inaccordance with UL 94 or CAN/CSA-C22.2 No. 0.17. Polymeric materials used solely to enclose electricalparts that are not part of a fire-hazardous circuit may have a minimum flammability rating of 94-HB. 用作外壳的聚合物材料应具有可燃性等级
5.3.4 A polymeric material used as an enclosure of a device marked for wet location use shall comply with the ultraviolet light exposure test specified in UL 746C or CAN/CSA-C22.2 No. 0.17. 标记用于湿位置使用设备的聚合物材料外壳应符合紫外线暴露测试；
5.3.5 With respect to UL 746C, the following tests are not required to be conducted:
a) The abnormal operation and severe conditions test, 异常操作及恶劣工况测试；
b) The input after mold-stress relief distortion test, and 模具应力消除变形试验；
c) The volume resistivity test 体积电阻率试验；
5.3.6 A device shall comply with the mold-stress relief distortion test of Clause 8.9. 模具应力消除变形试验
5.3.7 A polymeric material used for direct support as electrical insulation shall be able to withstand the hot wire ignition (HWI), the comparative tracking index test (CTI), and the high current arc ignition (HAI)to a level of at least the values in accordance with Table 5.2.电气绝缘的高分子聚合物：灼热丝燃烧，相对漏电起痕指数测试，高电流电弧点火；
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