Issue link: https://docs.hic.us/i/852277
11 Important Safety Instructions [When the product is used in a nominal rating up to 120V] This product is for use on a nominal 120V circuit, and has a grounding plug that looks like the plug illustrated in sketch A in Figure-1. A temporary adaptor, which looks like the adaptor illustrated in sketches B and C, may be used to connect this plug to a 2-pole receptacle as shown in sketch B if a properly grounded outlet is not available. The temporary adaptor should be used only until a properly grounded outlet can be installed by a qualified electrician. The green colored rigid ear, lug, and the like, extending from the adaptor must be connected to a permanent ground such as a properly grounded outlet box cover. Whenever the adaptor is used, it must be held in place by the metal screw. Grounding pin Metal screw Cover of grounded outlet box Cover of grounded outlet box Adapter Grounding means (B) (A) (C) (C) Figure-1 Grounding methods