Can you connect two grounds together?

You may connect the minus point of several batteries to the same ground, you may have different strings of batteries connected in series. If you know for sure that the 5 V supply is floating, you may connect both minus points together regardless if the 12 V supply is grounded or not.Click to see full answer. Hereof, can you connect two ground wires together?There is only one green ground screw connection on an outlet. The two ground wires must be wire-nutted together along with another 6-inch length of green or bare ground wire known as a pigtail. A grounded electrical outlet has three holes to provide a ground connection for three-prong plugged devices.Beside above, do both ground wires need to be connected? All ground connections must be made by connecting the ground wires together. So in your situation you are correct, you’ll connect the ground from the supply to the ground from the fixture using a twist-on connector (or other approved connection). Regarding this, can 2 power supplies share a common ground? If the two power supplies share a common ground, or can be made to, then it is no problem. However, the return wire must be sized for the sum of the 8 V and 12 V currents.Is Double lugging against code?First, it’s against the NEC (electrical code). “NEC 110.14(A) Terminals: . Terminals for more than one conductor and terminals used to connect aluminum shall be so identified.” In other words, if the breaker is not approved and labeled for 2 conductors (black wires), it is not allowed.