In most cases, a standard single-pole switch is sufficient for wiring multiple ceiling fans on one switch. However, if you plan to control the fans independently or have additional features like variable speed control or dimming, you may require a specialized switch.
There should be no problem running 4 ceiling fans on a single 15 ampere circuit, though it will depend on what else is on the circuit. Say a 52" fan is 90-100 watts (at high speed), plus three 60 watt bulbs. That puts each fixture at 280 watts or so. Which means four of them, would be 1120 watts.
Using Multiple Fans
Fans in series can be useful in high resistance systems. "n" fans in parallel will increase flow "n" times at a given pressure level, with no additional shutoff pressure generated. Fans in parallel can be useful in low resistance systems.
There are maximum 10 points in light and fan sub-circuit as per IE (Indian Electricity) rules. The maximum load for a single light and fan sub-circuit should not exceed 800 W.
They're not complicated, but they can cause issue in pre-wired situations. You need a 2 wire (120VAC) to the speed controller, and then a dedicated 2 wire from the switch to the fan. You can daisy chain up to 5 fans in parallel on one controller.
Consolidating multiple ceiling fans onto a single switch offers the convenience of centralized control. Instead of searching for and operating multiple switches, you can easily adjust the speed and lighting settings of all the fans simultaneously.
Each fan header can only supply so much current - check your motherboard manual but 3 fans is the usual recommended limit. As you are using powered hubs then this limit does not apply and you will be fine to use a splitter cable or daisy chain the hubs.
Many compact or portable appliances do not need dedicated circuits. Examples include portable fans, ceiling fans, countertop cookers, food processors and small space heaters.
For smaller appliances, do not plug more than two into one outlet. Know how much power you draw on an outlet or circuit; some experts recommend no more than 1,500 watts per outlet or circuit. Consult a qualified electrician to assess your home's electrical system, especially if you have an older home.
Most fan headers a 1A. Twelve volts at one ampere is 12W. At full capacity, most PC fans are 3W, so using up to four fans on one header is safe.
As a general rule, two fans in series (one behind the other) will nearly double static pressure capability but will not significantly increase air flow in a low impedance airflow system.
The ceiling fan direction in summer should be counterclockwise to help create a downdraft, which creates that direct, cooling breeze. Your fan direction in winter needs to be clockwise to create an updraft and circulate warm air around the room.
In general, combining axial fans in series does not increase the airflow but increases the air pressure. On the other hand, running fans in parallel does not increase the static pressure but increases the airflow.
You also must think about the spacing between those fans. Depending on the diameter of your fan, you will take that diameter and multiply it by 3 to find the distance between fans. For example, if the diameter of my fan was 6 feet, I would take 6 x 3 = 18. That means there should be 18 feet in between my fans.
Most Energy Star-certified ceiling fans of 48 to 52 watts draw around 0.4 amps of current, whereas a dual-motor ceiling fan of 50 to 150 watts draws 0.4 to 1.2 amps amperage.
When using 2 fans, please connect one of the fans to the CPU-Fan header and the second fan to one of the Case-Fan headers of your mainboard. Alternatively, you can also use a 3-pin Y-cable in order to run both fans via the CPU-Fan header. Such cables are available in specialised retail stores.
Signs of Overloaded Circuits
The most obvious sign of an electrical circuit overload is a breaker tripping and shutting off all the power. Other signs can be less noticeable: Dimming lights, especially if lights dim when you turn on appliances or more lights. Buzzing outlets or switches.
The average dedicated circuit costs $700, but it can range between $570 and $1,000, depending on the type of outlet and other factors.
Ideally, you should spread as many outlets around your home as possible and assign them to a single circuit. Just keep in mind the maximum load for a single circuit. A good rule of thumb is to assume that there will be a maximum power draw of 1.5 amps for each outlet, allowing 10 outlets for a single 20-amp circuit.
Ceiling exhaust fans, overhead lighting and cabinet lighting can be on with other lighting up to a maximum of 12 fixtures on one circuit.
Your laundry room should have a dedicated circuit of at least 20 amps. If you have a gas dryer, both your washing machine and gas dryer may be plugged into the same outlet. If you have an electric dryer, it will need its own dedicated 20-amp, 220-volt circuit.
Circuit – Ceiling fans can be installed on general lighting circuits in most cases. Some larger fans may require their own dedicated circuit. Wall switch – The wall switch control must be rated for ceiling fans if it will be used to operate the fan.
To connect multiple fans onto a single fan header, you can use Y-cables (NA-YC1) or 3-way splitter cables (NA-SC1 Sx2). Multiple cables can be daisy-chained to control even more fans via a single fan header.
It's a nice idea and definitely cuts down on cable management. This of course makes for a tidier back panel and an easier build overall. However, this creates an inherent limitation: Every stack is seen by the PC as a single fan, so every fan in that stack must invariably act identically.
There is 12V and ground, those two are needed for power (you need ground to close the circuit and for current to flow). The other two are sense/tachometer which reports back your fans current speed to the motherboard, and the last one is PWM, which controls the fans speed.