好帖子，受益匪浅
收藏一下，非常好的分享
真是涨知识了，很全面，很系统
通过看1910 303,能确定笔记本电脑 出口美国， NRTL 认证是强制还是自愿么？答案是自愿性认证。
笔记本电脑是用于工作场所么？
Electrical conductors or equipment (See Listing of Specific References under 1910.303 and 1910.307).
1910.303(a)
Approval. The conductors and equipment required or permitted by this subpart shall be acceptable only if approved, as defined in § 1910.399.
1910.303(b)
Examination, installation, and use of equipment -
1910.303(b)(1)
Examination. Electric equipment shall be free from recognized hazards that are likely to cause death or serious physical harm to employees. Safety of equipment shall be determined using the following considerations:
1910.303(b)(1)(i)
Suitability for installation and use in conformity with the provisions of this subpart;
Note to paragraph (b)(1)(i) of this section: Suitability of equipment for an identified purpose may be evidenced by listing or labeling for that identified purpose.
1910.303(b)(1)(ii)
Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided;
