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what are the acceptable ways to attach ground wires to receptacle-electrical box with 1- 14/2 coming in and two-14/2 going out. Could two or three ground wires be attached (wrapped around) to one of the (two) bonding screws to save space (by not using wire nut)? If wire nut is used, what color/s and what's the max # ground wires bundled per wire nut? Is it a good idea to trim ground wire right at the bonding screw or leave some length passed the screw?
Usually most places require the grounds to be attached to each other and at least one of them attached to the box and one attached to the receptacle. There are a few different ways of doing all of that but I usually run one ground behind the box screw and then bring it together with all the others plus add one extra length of ground wire to the bunch and wire nut them together. That extra wire can then be attache dot the receptacle . You would have 4 grounds wire nutted together so I would use a red nut or large black.