The National Electrical Manufacturers Association (NEMA) has published FB 2.20-2007 Selection and Installation Guidelines for Fittings for Use with Flexible Electrical Conduit and Cable.

美国国家电气制造商协会出版了FB 2.20 - 2007用于电气管道和电缆配置的选择和安装手册。

youdao

Dubbed "NEMA Premium"--a standard created last year by the National Electrical Manufacturers Association for motors between 1 hp and 200 hp--these motors offer a few extra percentage points of energy efficiency and sell for roughly 25% more than motors meeting minimum federal standards.

FORBES: Magazine Article