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Common Home Concerns: Ground Fault Circuit Interrupters (GFCI)
Ground
fault circuit interrupters are supersensitive circuit breakers that monitor
the electrical current flowing in the hot (black) and neutral (white) wires
of a circuit. If the current flow in both wires is the same, everything is
functioning properly. If, however, more current flows in one wire than the
other, there’s current leakage to ground. A GFCI can sense any current
difference and cut off the power to the circuit within 1/40th of a second.
This could save your life because a continuous flow through your body could
be lethal. You are particularly vulnerable when on wet ground or in a damp
bathroom.
Considerations
GFCIs are available for residential use in several forms: in a wall
receptacle, in a circuit breaker or in a portable outlet unit. GFCIs are now
required for all new construction receptacles near a water source such as at
exterior, garage, bathroom and kitchen locations. Whirlpools, spas and
swimming pools also require GFCI protection. While GFCI’s may not have been
required at the time of original construction, the HouseMaster Technical
Staff recommends their installation in appropriate areas of all homes. |
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Common Home Concerns: Roof Ventilation
Adequate
ventilation of unconditioned attics is essential to avoid excessive heat or
moisture build-up. In warm weather, such build-up in the attic can shorten
the service life of the roofing and increase living area temperatures. In
many areas, summer heat also means high humidity. This can ultimately lead
to mildew and fungi growth and even sheathing decay. Even in cold weather,
moisture in the air can condense out onto the cold roof sheathing eventually
causing sheathing damage.
Consideration
While it is essential to provide adequate ventilation by passive means such
as soffit vents as well as ridge and gable vents, forced venting may be
advantageous in some cases. A wind turbine ventilator can be added for a low
cost boost to airflow. Electric attic exhaust fans are more effective at
replacing the hot humid attic air with cool outside air. Thermostatic
controls are provided for these units; in certain situations, a humidistat
may also be needed. The HouseMaster Technical Staff advises homeowners to
ensure that adequate intake air provisions are also provided for any
ventilation system, otherwise air flow will not be efficient.
Aluminum Wiring
The use of aluminum wiring is common practice in many areas
(especially in the Phoenix area) for major appliances such as kitchen
ranges and electric dryers. (which are run on 220-volt circuitry)
While aluminum connections in general, have a greater potential to
come loose or exhibit other problems than copper, the concern is NOT as
great on major appliance circuits as it would be if the wiring were on
older 110-volt household circuits. There are several reasons for this
lower level of concernwith 220-volt circuitry:
1. Normally there are only two connection points in the circuit ?
at the appliance and at the distribution panel; Multi-stranded
conductors are used
2. The connection points or lugs are of a different design than
that found in a household receptacle
3. The wire connection usually is straight without a sharp bend or
crimp
4. The heavier wire used does not bend or crimp as easily as the
smaller gauge wire some crimping is less to be an issue
5. Oxide inhibitors can be applied to the exposed wire at the
terminals to cut down on oxidation
6. Major appliances and their currents are more likely installed
by qualified professional electricians, whereas household wiring is
often installed or worked on by apprentices or homeowners
In any case, it would be a good idea to have all aluminum connections
checked periodically as a precautionary measure. |
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Fluorescent-Style Lightbubs that go into Regular Lamps
The fluorescent-type bulb, once only seen in commercial applications,
has gained in residential popularity due to its low operating cost and
the natural illumination now available with modern bulbs. Traditional
fluorescent bulbs are straight 24- or 48-inch long tubes.
Now circular, U-shaped, short, thin and any number of configurations
are available, including ones to replace standard incandescent bulbs in
many household lamps. Colors range from cool blues, to full spectrum
white, to warm tones.
Fluorescents spread light evenly and are more energy efficient,
providing up to five times the light of an equivalent wattage
incandescent. They do not produce much heat, last a long time (10,000 to
20,000 hours), and are about four times more economical to run than
incandescent lamps.
All fluorescent bulbs or tubes operate in a similar manner. Two
filaments, a small transformer, a ballast, a starter (if needed), and
gas sealed in the bulb, combine to do the trick. Current which flows
between the filaments, releases electricity to send an arc of
ultraviolet light through the gas-field bulb. This light becomes visible
as it filters through the phosphorous coating on the bulb. The ballast
then acts as a step-down transformer to control the electric current. |
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