High temperatures cause conductors to expand and hence increase in length. The converse is true for low temperature conditions. The change in length varies from one conductor to another depending on its thermal expansivity. The length of copper conductors, for instance, changes by 5 feet per 1000 feet of length when the conductor temperature changes from 100 – 0°, while aluminum changes by about 7 feet. The length increases with increase in temperature and reduces with reduction in temperature.

This increase or decrease in length is of great concern when installing power transmission lines between poles and towers, or when installing other power connectors. There must be an allowance for this change in length since it can cause catastrophes if it’s not there.

Weather changes are associated with increase and decrease in temperature and thus affect power transmission lines and other conductors. However, change in temperature is only one factor that affects power lines. Below are the changes that occur to power lines and other conductors as a result of weather changes:

The amount of heat dissipated from power conductors is reduced during hot and calm weather conditions. Basically, if the temperature of air around the cable is low, more heat is lost from the cable to the air. If the air is already hot, the exchange of heat is lesser. This low heat dissipation causes the lines to overheat. However, the rise in conductor temperature (overheating) worsens when cables are transmitting too much power than required. The first effect of this increased conductor temperature is snagging, which is the downward bulging of the cable between two poles, caused by the increase in the length of cables.

Snagging is largest during extreme hot weather (largest increase in temperature) conditions experienced in summer. The increase in length results to downward bulging of the cable due to the effect of gravity. Excessive sagging is dangerous if it goes below the accepted height clearance – cables could come into contact with trees, buildings and other structures underneath, causing electrocution and fires.

Excessive sagging represent an added weight on the power line and this increase may cause the line to fail or to pull down weak poles and towers. The effects can be small but gradual and so the poles and towers will finally come down or require some adjustment/replacement after some time, which is costly. This sagging can also cause the lines to short out. Excessive sagging is also costly since it leads to increased electrical resistance. This means that a sagged power line transmits lesser current than it normally does, thus causing under-feeding of electrical equipment and industries. It is also costly and time consuming to rectify a sag.

Mortgage lenders try to look at the big picture, considering things like taxes and insurance when deciding how much they can loan out to homeowners and buyers. However, there's a major ongoing expense that appraisers currently don't take into account – monthly utility bills. You don't need to be an electrician to understand that the money you pay for power each month makes an impact on your budget and even affects the value of your home. A bill currently in front of Congress – the SAVE Act – would acknowledge that reality and let federal mortgage lenders make energy efficiency part of their formula.

Increasing the Value of Your Home

Essentially, the SAVE Act would make it easier to get financing for efficiency upgrades, even folding funding for it into traditional mortgages.

“This bill would require federal mortgage agencies to recognize the energy efficiency upgrades in a home during the mortgage underwriting process, thereby increasing the value of the home,” President of the Alliance to Save Energy Kateri Callahan said in a statement. 

The SAVE Act claims it would bring a number of benefits in addition to loosening the drawstrings on bank financing for efficiency. Among them:

A Diverse Group of Supporters

The SAVE Act was first introduced in 2013. Although Congress has yet to vote on the measure, it has lined up a diverse group of supporters who aren't typically on the same side of major issues, from the U.S. Chamber of Commerce and the National Association of Manufacturers to the Alliance to Save Energy, the National Resources Defense Council, the U.S. Green Building Council and others.

In the meantime, there are a number of steps you can take around your home today to cut down on your utility bills. If you need any help installing efficient appliances or upgrading your home electric system, contact an expert electrician today.

It’s cold throughout MD, VA, and DC now, but the weather will soon start to change. Before you know it, it’ll become warmer, which means you should begin thinking about attic fan installation. An attic fan is a ventilation fan that regulates the heat level of a building’s attic by exhausting hot air. It is similar to a kitchen fan but located in the attic of a home. An attic fan is usually connected to a switch or string that you can access from the top floor of your home. You may be surprised to learn about all the benefits of installing an attic fan in your home.

Attic fans are key to maintaining an energy-efficient home. Your air conditioning unit will have to work overtime if you allow rising heat to stay in your home instead of routing it up and out. This ultimately reduces the unit’s efficiency. An attic fan is an excellent home cooling option that also keeps your energy bill down in hot summer months.

An attic fan helps reduce the humidity, or overall moisture level, in a house. Daily household activities—showering and cooking, for example—create moisture that rises and can build up in the attic if the space isn’t properly ventilated. If you don’t take any action and allow this moisture to sit in the attic for an extended period, it will eventually create mold in the insulation and possibly even in the wood structure of the attic. This moisture can be especially damaging during the wintertime (now!) when cold turns it to ice or frost. The expansion of ice and frost can seriously damage your roof.

An attic fan helps combat moisture and transfers it out of the attic before it can cause serious damage to insulation, wood structure, and roofing materials. Now is the perfect time for attic fan installation—it will help prevent ice or frost from forming and damaging your roof, and you’ll need an attic fan for the warmer months anyways. Contact Kolb Electric for attic fan installation.

Here’s a question: are you currently leaving the windows of your home closed? Doing so could trap gas from your furnace or oil heater in your house. These combustion gases can be removed with the help of an attic fan.

This really is the perfect time to schedule attic fan installation. We’ve been serving Baltimore and Bethesda, MD as well as Alexandria, VA and Washington, DC since 1925. You can count on our experienced electricians to get the job done right the first time. Call us or contact us online for installation.

One studied alternating current (AC), and the other, direct current (DC). And yet, the world would not be where it is today without their contributions to science and electricity. In light of Nikola Tesla’s birthday on July 10, Mr. Electric is taking a look at the electric Tesla vs. Edison feud.

The main focus for Tesla was alternating current: an electric charge that periodically reverses its direction and is delivered to customers through a transformer. It travels at a much higher voltage than direct current and is more effective because of its ability to travel greater distances while maintaining a constant voltage.

Edison focused his research of electricity on direct current. A key difference between alternating current and direct current is that direct current only flows one way. The voltage of direct current is also constant but it is better when the electricity produced has to travel in short distances.

Edison was working on a system to generate direct current. When he could not get it to perform correctly he hired Tesla, an engineer and graduate of The Polytechnic Institute, who studied electromagnetism, promising him $100,000 if he could correct the problems Edison was having with his research and invention. Tesla corrected the problems but was not given the money. Tesla resigned and Edison spent the rest of his career trying to discredit Tesla’s research and work with electricity.

Today, nearly every home and business in the world is powered using Tesla’s alternating current. The ability of alternating current to travel over long distances and efficiently power everyday home and business electrical equipment eventually overtook Edison’s research on direct current. Edison did not lose out completely, as most battery-powered devices, fuel cells and light emitting diodes use direct current. As the push for alternative energy sources is on the rise, many manufacturers are looking at how batteries and electricity can change the way we look at fuel and the way goods are produced. Whether the electricity being used is AC or DC, Tesla helped us get where we are today.

For some reason, some homeowners seem to think that their ceiling fans are more fashionable than they are functional. This could not be further from the truth, though. While your ceiling fans are not going to actively cool the air in your home, as an air conditioner will, they are able to help distribute cooled air throughout the house more effectively. This can help to make your home feel more comfortable, allowing you to raise the temperature at the thermostat a bit. They also use far less energy than ACs, so put them to use, rather than your air conditioner, on stuffy nights that aren’t quite intolerably hot.

Not only will ventilating your home when the sun goes down help you to boost the quality of the air in your home, but it can also take a serious amount of strain off of your air conditioning system. It sounds simple, but simply shutting down your AC and opening up the windows when the air outside cools down can make a big difference. Close the windows early in the morning when you wake up in order to trap cool air therein.

While there are many ways in which you may go about cooling your home more efficiently, the best is simply to dial our number and to schedule routine air conditioning maintenance service. Our professional technicians will thoroughly inspect your system and tune it up as needed. This will allow it to cool your home with as little energy consumption as possible. Contact us today to schedule maintenance with professional technicians you can trust.