Limit switches, as the name suggests, are precision switches that are designed to work as limiting devices. The switch is typically snap-action and designed to sense the presence, absence, or be triggered by an excess or lack of physical contact at the position where it is installed.

The flexibility and adaptability of limit switches to different tasks and environments has made them very popular as components of conveyor belt systems.

Industrial conveyor belts are considered to be amongst the greatest inventions for boosting production, as well as reducing time, costs and manpower requirements. They are commonly used in production, mining, assembly lines and just about every major industry or sector today.

They typically consist of a number of pulleys that rotate under a continuous belt. Some of these pulleys are powered and they drive the belt, keeping any material on top continuously moving towards its destination.

Conveyor belts can be broadly classified into two classes, which are:

These conveyors are used for transporting smaller volumes of material like packaged goods, or lighter materials like boxes.

These are heavy duty conveyor systems which are designed to carry heavier loads or bulky materials, like industrial and agricultural goods.

While conveyor belts can tremendously increase efficiency, they are prone to jamming from over-loading unless the correct safety measures are put in place. Limit switches help prevent this by measuring the height or number of individual products passing through the conveyor system. In case the switch senses an object that may cause an obstruction, it shuts the system down to prevent damage or spillage.

Depending on the environment and purpose, there are a variety of limit switches which can be used in conveyor systems:

The Better Business Bureau, which is known to many as the BBB, is in existence to maintain trust between consumers and businesses. Since 1912, the Better Business Bureau has been providing consumers with reviews on businesses in the United States and Canada. In addition, the BBB works to reconcile issues that a consumer has with a business. Businesses that are trustworthy will receive high ratings. Businesses that do not do well, have many complaints, and have substandard business practices will receive low ratings.

Suppose that a homeowner or a business is seeking an electrical subcontractor.  There are plenty of businesses and individuals who specialize in this trade. However, talk is cheap, and references can be forged. The Better Business Bureau has put hours of research into determining which companies are  trustworthy, and provided each of these companies an exemplary rating.  This means that the BBB has officially looked into the credentials and claims of electrical subcontractors. Some have received a high BBB rating while others have not. A benefit of the BBB is that it has already done the homework for what company or companies will do the work correctly. This information can provide peace of mind and reassurance to someone who is looking to hire a Denver electrical subcontractor.

Having a non-profit organization do research to find what businesses are trustworthy makes a big difference in saving money, providing quality work and hiring with confidence.   The Denver Better Business Bureau is a fine example. When in need of a trustworthy business, go to the BBB.

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.