Used to electrically isolate the cable tray from the accessory.
2 x BB981 nylon shoulder washers electrically isolates the BA313 large hanger angle (up to 1/2" threaded rod) or the CCT Center Hanger.
To electrically isolate the CCX Center Support Bracket, use 1 BB933 nylon flat washer and 1 x BB981 nylon shoulder washer. |