FB 2.20 provides installers and code enforcement officials with comprehensive guidance on the proper selection and application of the most common cable and flexible conduit fittings.
These hazardous location cable glands and strain relief fittings are made of high performance nylon and can be ordered in either blue or black colors.
这些危险场所电缆密封套管和插头由高性能的尼龙材料制造而成，且颜色有蓝色和黑色两种可选。
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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.