Sunday 22 July 2012

Electrical code for the home

Electrical codes are in place to protect you, the homeowner. These general guidelines apply to new installations and will give you the basics of what electrical inspectors are looking for. Be sure to check with your local electrical inspector because local codes may vary from the list provided. In the case of existing housing, the codes will apply if you are updating a home, and it requires an electrical update. It is also suggested that you update if the wiring in your home is unsafe and a danger to your family.

Bathrooms
Bathrooms use a lot of power and may need more than one circuit. Mainly, because you may have a curling iron, razor, hairdryer, and the combination light, fan, and heater all running at the same time. The combination fan, light, and heater should have its own 20-amp circuit. Likewise, the outlet should have its own 20-amp circuit. All outlets in bathrooms should be GFCI's. Light fixtures should be covered with lenses or globes and moisture resistant if placed in a shower or tub area.

Kitchen
A kitchen should have a separate circuit for each appliance with a motor. The microwave, refrigerator, garbage disposal, and dishwasher would be the major appliances included. Generally, the code requires that you install a minimum of two receptacle circuits in the area above the counter top. An electric range, cook top, or oven must be wired to a dedicated 240-volt circuit.

Living Room, Dining Room, and Bed Rooms
These rooms require that a wall switch be placed beside the entry door of the room so that you can light the room before entering it. It can either control a ceiling light, a wall light, or an outlet connected to a desk lamp. The ceiling fixture must be controlled by a wall switch and not a pull chain type light. Wall receptacles should be placed no farther than 12 feet apart. Dining rooms usually require a separate 20-amp circuit for one outlet used for a microwave, entertainment center, or window air conditioner.

Stairways
Special care is needed in stairways to ensure all of the steps are lighted properly. Three-way switches are required at the top and bottom of the stairs. If the stairs turn, you may need to add additional lighting to accommodate the area to be lit.

Hallways
These areas can be long and need adequate lighting. Be sure to place enough lighting so shadows are not cast when walking. Remember, hallways are often escape routes in the event of inclement weather and emergencies. A hallway over 10 feet long is required to have an outlet for general purpose. Three-way switches are required for the two ends of the hallway. If there are more doors throughout the hallway, say a bedroom or two, then you may want to add addition four-way switches to the circuit outside the door of each room.

Closets
Closets must have one globe covered fixture controlled by a wall switch. Exposed bulb fixtures, like pull-chain fixtures, get hot and come in contact with clothing or other combustible materials stored in closets. Although your existing home may have these fixtures, it is recommended that you change them for safety reasons.

Laundry Room
The washer and dryer should have its own 20-amp receptacle. In the case of an electric dryer, a separate 240-volt circuit should be installed.

Attached Garage
Inside the garage there should be at least one switch controlling the lighting. It is recommended that three-way switches be installed for convenience between the doors. This lighting should be in addition to any garage door lighting that you may have. Garages need a separate circuit for at least one outlet. This is generally required to be a GFCI outlet. You should check your local code to be sure. When in doubt, make it a GFCI. Any outside outlets connected must be either a GFCI outlet or an outlet connected to a GFCI breaker.

Remember that the electrical codes are in place for your safety. Although you may believe that they are overkill at times, these practices save lives everyday. When it comes to electric safety, don't become a statistic! Follow the rules of the codes and be sure to have your local electrical inspector give you the green light for the safety of your family's sake.
Does your home meet the electrical code requirements?

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how to size your window air conditioner


If it's time for a new window air conditioner, but you don't know what size you need, this chart will be helpful. Air conditioners are rated by BTUs and their cooling capacity is directly related to the number attached to this BTU symbol. The larger the BTUs, the greater the cooling capacity.
Another factor is physical size. The size of the window air conditioner is directly related to the number of BTUs, let me explain. You see, small window air conditioners have smaller BTU ratings. The larger the BTU cooling capacity, the larger the window air conditioner.

The next thing to consider when sizing a window air conditioner is the power availability near the window that you're going to install the unit. Window air conditioners come in both 120- and 240-volt models. Each requires a different electrical outlet, so be sure to check that out in advance of purchasing the unit or you may need to rewire and outlet for the unit.

Also consider the actual window opening that the unit will be placed in. To do this, open the bottom window and measure the height and width of the window opening. This is the maximum opening that the window air conditioner can fit.

The table below lists the square footage of the room and the required BTUs needed to sufficiently cool the room. This gives an indication of the size unit that will run the most efficiently, without overworking the air conditioner on those hot days.

Air Conditioner Sizes

BTU's Required / Approximate Square Feet of Cooling
5,000Less Than 150
6,000150-225
7,000225-300
8,000300-350
10,000350-500
12,000500-650
14,000650-875
18,000875-1,100
21,0001,100-1,300
25,0001,300-1,600
29,000Less Than 1,

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Air conditioning time!

Air conditioners come in many different sizes, whether they are window air conditioners or central air conditioners. These units should be sized to cool the area of your home you’re trying to cool with the most efficiency. So how do you do that? Well, by measuring the area of the area to be cooled, you’ll have a pretty good idea what size air conditioner is for you.
To calculate this, simply multiply the length times the width of the room or area to be cooled. Then, as a practical number, multiply that total times 25 BTU. This allows ample cooling, whether it is a rainy, moist day or a hot, sunny, humid day. Let’s say the room is 12 feet wide by 15 feet long. That means 12x15=180 square feet. Take the 180 sq. ft. times 25 BTU per square foot and you get the minimum BTU air conditioner you should buy. That means 180x25=4500 BTU cooling capacity is needed.


You may ask if a smaller air conditioner will work or a larger one may be better? Here’s a thought about those questions. Smaller BTU units will continually run, just trying to keep up. This will increase your electric bill and it is unlikely the unit will be able to cool the area effectively.
An air conditioner too large can be overkill. To dispute the rumor that bigger is better, an air conditioner too large will cool more quickly, but that may impede the reason for running the air conditioner in the first place. You see, along with cooling the air, the air conditioner is also extracting moisture from the air (humidity) that makes all of us feel hot and sticky. Although the air may be cooler, if the unit doesn’t run long enough, the moisture cannot be extracted from the air properly. It would be like being outside camping on a cool, clammy, foggy night. You know the feeling when your skin is moist and you get goose bumps when cool air flows over it. Besides, an air conditioner too large will cycle on and off frequently.


Do yourself a favor and measure the area of the home to be cooled, calculate your BTU needs and size the air conditioner properly. Your local appliance store or heating and cooling center can aid you in selecting the proper air conditioner size for your home. Remember, too little is never enough and too much of a good thing can be bad.

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www.absolutelyelectrical.com
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