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Don't let anyone touch the live electrical parts. This voltage is significantly more dangerous than 120V. If you touch it it's likely to grab you and not let go.
All components must be rated for the voltage in question. Switches must be rated for 277V, as well as lights, all boxes, junctions, and all electrical wiring must have insulation rated for 277V or above. The circuit breakers must be rated for this voltage, and they must be rated for the available fault current which could pass through the wiring of the circuit, based upon this new voltage.
Because this circuit is more than 150V to ground, there are more strict rules on who may perform the work. Review the rules for your locality before cracking any covers. It's likely you should be a licensed electrician before tinkering with this stuff.
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