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.

Los Angeles is undertaking a quiet revolution, a switchover to electric cars. This is a revolution that promises bluer skies and greater freedom from foreign oil. At this writing, the Middle East is involved with its own, noisier revolutions, and the stock market is tumbling thanks to perennial shakes over skyrocketing oil prices. Everybody who wants to be independent of foreign oil right now, raise your hands!

Getting back to the other revolution, the quiet one, going on in Los Angeles… car makers and dealers, drivers, and electrical contractors are all involved in a switchover to electric vehicles (EVs). The government is backing it with tax credits and rebates. More on that in later posts.

In December 2010, Nissan started selling an electric car in L.A., the Nissan Leaf. Early this year, G.M. will start selling the electric Chevy Volt. This revolution isn’t confined to L.A. – all along the West Coast and some of the East Coast, deliveries of EVs to new owners are starting. But L.A. is out ahead of a lot of the rest of the country. The Leaf and Volt won’t go on sale, for example, in South Carolina until next December. Pike Research, a transportation analysis firm, has projected that only New York City will beat us out in electric vehicle sales. Pike Research projects 96,000 EVs will be sold in L.A. by 2017. Of course, EV sales could move faster if the price of gas shoots past projected levels.

Both the Nissan Leaf and Chevy Volt will be priced for middle income families. As electrical contractors in Los Angeles, we’ve already started installing chargers, including in home garages, apartment buildings, and commercial venues.

The Leaf is all-electric with an average range of 100 miles before its battery needs to be recharged. The Volt is a hybrid. With a fully charged battery, it can drive about 35 miles and then, it starts burning gas. Drivers can recharge their Leaf or Volt batteries by pulling out their special cord called a “Level 1 Charger” and plugging it into an outlet that carries regular house current.

The advantage of Level 1 charging is that it’s simple and inexpensive to set up. Hire an electrician to install a circuit in your garage or carport. It will need to be a dedicated circuit, meaning that no other appliances, like a washer, for example, will use it. The outlet will need to be the safety version usual in garages and outdoors (a GFI outlet). Also, your electrician will need to check whether your electrical panel should be upgraded in size to handle the increased power demand. Once the outlet is installed, the EV driver pulls out the Level 1 charging cord that comes with the car, starts charging, and lets the car sit … for a long time.

Level 1 charging is… well, slow. A Chevy Volt battery takes 10 hours from empty to full; a Nissan Leaf takes 20 hours. But help is on the way – Level 2 charging. More on that in my next post or click here for our article which talks about Level 2 Charging.

And did I mention that The Electric Connection website offers $25 off your first electrical job? Plus coupons for Whole House Surge Protectors and other services? Check it out.

Decorative LED path lights are the perfect gift for dads who want to add an upscale look to their yard. Shade styles include mushroom, frosted glass, offset cone, or hammered cone, and offset linear light heads are also available to direct illumination exactly where it’s needed. These LED path lights can be used for numerous applications, such as garden lights, patio lights, driveway lights, walkway lights, or sidewalk lights. The long-lasting fixtures emit up to 155 lumens of warm white illumination. They’re constructed of powder coated bronze or black aluminum and are weatherproof as well as rust resistant. Each path light comes with a screw-on ground stake.

This easy-to-install, low-profile light mounts directly to a junction box or in a can light housing. It’s perfect for low ceilings, basement, garage, hallway, closet, bathroom, workshop, and shed lighting. The long-lasting LED ceiling light consumes eight times less power than incandescent bulbs with equivalent output. It emits up to 1,100 lumens of natural white or warm white illumination and has a high color-rendering index (CRI) to show the true colors of objects and surroundings. A removable E26/E27 Edison screw base is included along with hardware for mounting to a junction box or in a can light housing.

Help him enhance the look of his boat while increasing nighttime visibility! LED underwater boat lights can be used as transom lights for colorful wakes, attracting fish, or for nighttime swimming and diving. Single-, double-, and triple-lens versions are available, and the underwater lights produce powerful red, green, blue, white, or RGB color-changing illumination. RGB underwater lights are capable of nine dynamic color-changing and single-color modes with an RGB controller and RF remote (sold separately). The LED lights are designed to last 42 times longer than underwater lights with incandescent bulbs.

one of 11 retrofit kits designed to replace existing Metal Halide and High Pressure Sodium lights in their existing fixtures. Multiple mounting options are included so you can use these lights in fixtures such as high bays, flood lights, area lights, shoe boxes, street lights or wall packs, to name a few. Installation is simple and easy and is no more difficult than a bulb and ballast replacement. Patent Pending Heat Sink technology allows this LED retro kit to run significantly cooler than other heat sink designs. Because of this, the head itself is warrantied for 10 years. Utilizing high efficiency Nichia LEDs, these kits produce an incredible amount of light while consuming very little power to do so. Compare these to the competition, you will save a lot of money on your utility bill using our Retrofit kits compared to the competitions.

LED Retrofits can be installed anywhere including

Since 1989 approximately 1 billion feet of CSST gas line or yellow gas line has been installed.  Nearby lighting strikes can cause an electrical surge and puncture the CSST line.  Bonding is considered electrical work and should only be performed by a qualified electrician.

In new construction we bond all gas lines.  Currently about 500,000 new homes per year have CSST gas line installed in them.  However, CSST gas line is considered safe when properly installed in your home.  Part of the installed properly guidelines refers to bonding your CSST gas line, your local electrician can do this for you.  If your home is more than two years old we recommended you have a licensed electrician check for proper gas line bonding.  Many real estate transactions and inspections require the CSST line to be bonded prior to the sale.   A good source of information on CSST lines can be found at CSSTSafety.com.

“CSST should NOT be confused with flexible gas appliance connectors – the product that joins a moveable appliance to your home or building’s gas supply line. The difference is flexible connectors attach directly to the moveable appliance from the wall or floor. CSST is usually routed beneath, through and alongside floor joists in your basement, inside interior wall cavities and on top of ceiling joists in attic spaces.” CSST Safety.com

If you would like more information or to check to see if your CSST line is properly bonded please feel free to Contact us anytime!  We bond CSST gas lines in the Des Moines area and surrounding communities.