From 
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Mounting With Screws and Cap Nuts
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Mounting With a Threaded Pipe
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1. Turn off the power to the light fixture at the main circuit panel. Remove the nut or screws securing the dome-shaped canopy and lower it. Then remove the screws securing the crossbar to the electrical box and lower the fixture.
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2. Test the wires to make sure the power is off. Move the tip of a non-contact voltage detector near each wire to make sure the power to all wires in the box is turned off (make sure the light switch is turned on). If the tester lights, switch off circuit breakers or loosen fuses one at a time until the tester light goes off. Disconnect the wires from the light fixture. Leave other wires connected and tucked into the electrical box.
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CAUTION: Live Wires
3. Test for Ground: Step 1. Turn the power to the light back on at the main circuit panel (the light switch is still on). Use the non-contact tester again to make sure there is power to the colored (hot) wire.
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CAUTION: Live Wires
4. Test for Ground: Step 2. Touch the leads of a neon voltage tester between the hot wire and the metal box (or between the hot wire and bare copper ground wire if you have one). If the tester lights, the metal box or bare copper wire is grounded and you can proceed. If the tester doesn’t light, indicating there is no ground, call in a licensed electrician to supply one. (It’s often difficult.) Turn off the power at the main circuit panel before continuing.
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5. Attach a ground wire to the metal box if it’s not already present. Wrap the end of a 6-in. length of bare copper wire around a No. 10-32 ground screw and drive it into the threaded hole in the bottom of the box. Wrap the wire at least three-quarters of the way around the screw in a clockwise direction. Tighten the screw to secure the ground wire.
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6. Preassemble the mounting strap assembly. Align the back of the canopy (the side that fits against the ceiling) with the crossbar and adjust the length of the pipe until about 3/8 in. of the threads on the screw collar loop extend through the canopy. Lock the threaded pipe in this position by tightening the locknut against the crossbar.
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7. Position all the wires to one side of the crossbar. Then screw the crossbar to the electrical box with the screws. You’ll need a helper to support the fixture while you do this.
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8. Connect the neutral wire from the light fixture to the neutral white wire(s) in the box. If your fixture is wired with lamp-style cord rather than white (neutral) and black (hot) wires, identify the neutral wire by looking for silver conductors, writing, squared corners, or ribs or indentations on the insulation. The unmarked wire is the hot wire. Connect it to the colored (usually black or red) hot wire in the box. Complete the hook-up by looping the ground wire clockwise around the ground screw on the crossbar, tightening the screw, and connecting the end of the wire to the ground wire from the light fixture.
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9. Fold the conductors into the ceiling box and slide the canopy over the protruding threaded support. Secure it with the decorative nut to complete the installation.
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