The biggest mistake people make when installing a ceiling fan is probably the cheapest part of the installation, the box it is mounted on. Typically when a home is roughed in for lighting a round plastic box with 2, 6/32 screws to mount the fixture is used. This box is perfect for a 2 pound incandescent light, but absolutely not for a 20 pound ceiling fan. The plastic box is usually nailed to a joist with 2 diagonal nails making it very secure for your average light fixture.
This however is not secure enough for the weight and movement of a ceiling fan. You will need to change the box to an approved ceiling fan box. An approved box can be purchased at most building supply companies and should be used for any ceiling fan installation. The box differs from most boxes in that it is steel and attached to a substantial bracket that is secured to the joist by either nailing or expanding the bracket. In addition the screws are larger and go through the box rather than screw into it. That way the fan is hanging by the box and bracket not just the small screws.
CEILING FANS
The first step is to turn the power off, not the light switch, the breaker. Now you can safely remove the light fixture and box from the ceiling. If you have access to the light from above that is the best way to remove and install your new box. I would also recommend that you replace the wiring to the switch with a 3 wire romex so that you will have separate switch legs for light and fan. Even if your not using a light kit trust me it is better to have the other switch leg and not use it, then to want it later and not have it. Keep in mind this is only necessary if you want a special switch to control your fan.
If you don't mind using the chains no additional wiring changes are needed, unless the original wiring is not large enough to supply the fan, so be sure to verify wire size before proceeding. Chances are that light is not the only light on that circuit. If you cannot access the box from above you can still install your new box from below. Just follow the instructions carefully that come with your box. These boxes are designed for simple installation and most work very well.
Once you have your box and wiring installed it is time to hang your fan. If you happen to remove too much drywall when installing your box, you can purchase a plastic cover ring that will cover most holes. Hang the bracket, the fan motor will hang from, and be sure to attach your ground and safety cable. Hang your motor assembly on the bracket and connect your wiring and safety cable. If you used new wiring be sure to note which wire you use for lights and which you use for fans. Hook up the light wire whether your using the light kit or not. Hang the fan motor and secure it with the supplied screws. Attach the motor housing cover with screws provided and it's on to the blades. Attach your blades and install control switch if you are using one. Ensure everything is installed, the switches are off and restore power. Check the operation of your fan and or light.
Installing a fan is a very involved procedure, especially if you need to replace boxes and wiring. Before you begin, evaluate what is required to complete this task, and if you feel overwhelmed at all contact a qualified electrician to assist you. The key to the success of this installation is the box. Do NOT attempt to install a fan without the correct approved box. The most important thing in any electrical installation is to be SAFE!
Ceiling Fan Installation CEILING FANS
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