Purpose of Standards National Electrical Manufacturers Association Standards are adopted in the public interest and r designed to eliminate misunderstandings between the manufacturer and the purchaser and to assist the purchaser in selecting and obtaining the proper product for its particular need. Existence of a National Electrical Manufactures Association Standard does not in any respect preclude any member or non-member from manufacturing or selling products not conforming to the Standard.
SG 1-1958由NEMA - National Electrical Manufacturers Association 发布于 1958-01-01,并于 2010-09-18 实施。
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