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It depends on what 277 volt device you are trying to connect.
If there is no ground wire connect the ground wire to the neutral wire.
The neutral wire and power wire are never connected together.
Connect all white wires together under a wire nut and push them back into the box. Connect all ground wires together and then connect them with a jumper wire to the ground screw on the switch. Connect black power in and power out, if applicable, wires to the bottom screw on the switch. Connect the remaining black wire going to the light to the top screw on the switch.
Some older wire does not have a ground. All you can do in that case is use a jumper wire to connect the ground to the neutral.