There are three identical copper wires in the ceiling outlet, all with white plastic sheathing. Two are twisted together, the third is alone. The old swag light we want to hang for now (until we can afford an expensive, new fixture) has no grounding wire, two identical copper wires with a semi-transparent plastic sheathing. The fixture we took down had a bare grounding wire attached to a screw in the crossbar in the ceiling outlet, and two more wires with brown sheathing (identical, except one had writing on it: numbers, brand, and 300V), but we couldn't tell which was hot or neutral.
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