1.新增3.5内容：对于CLASS2电线额定电压不超过150V.
3.5 A wire or cable for Class 2 use shall have a voltage rating less than or equal to 150 V AC or DC.
2.新增4.3内容：由于可能不兼容性，裸铜，铜合金，铜包铝，铜包钢或其他最外层是裸铜 不应该和铝直接表面接触。可以接受隔离层来避免直接接触，或铜材质需要被镀层。
4.3 Due to possible incompatibility, uncoated copper, copper alloy, copper-clad aluminum, copper-cladsteel, or other components with uncoated copper on the outer surface shall not be used in wire or cablewhereby direct contact with aluminum may occur. A separator is one acceptable means of avoiding directcontact, or the copper components shall be metal-coated. 3.新增表5.2
4修订5.3.1，新增实心导体不能大于表5.1下一个AWG导体大小 5.修订5.3.3,新增绞合导体截面积不大于表5.1下一个AWG导体大小 6.新增
5.3.4 For a conductor composed of minimum 97 percent IACS unalloyed copper described in the Exception to 51.2(f) the determination of conductor resistance described in 5.6.1 – 5.6.3 may be used as an alternative method for determining conductor size and, in the case of a dispute, shall be used as the referee method of determining conductor size 7.新增5.3.5
5.3.5 5.3.5 For a conductor composed of a material other than minimum 97 percent IACS unalloyed copperdescribed in the Exception to , the determination of conductor resistance described in 5.6.1 – 5.6.3shall be conducted.. 除了在例51.2(f)描述的最小97%的IACS非合金铜外,导体阻抗取决于5.6.1—5.6.3.。 8.新增5.3.6
5.3.6 For a tinsel conductor, the determination of the conductor resistance marked on the tag [see 48.2(e)] shall be conducted in accordance with UL 1581, Section 220. 对于箔导体，在标签上标注的导体电阻参照UL1581 220节。
9.更改导体的绞距。绞距以前只规定了铜导体，现新增了铜合金，铜包钢，铝，铜包铝。
10.新增以下表格：