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.

Ask any parent what they spend a large portion of their day doing and many, if not the majority, are going to say worrying. There are loads of potential dangers out there, and as parents we are vividly aware of all of them. They exist everywhere, and we can’t really mitigate literally all of them. But we certainly have control over the dangers in our homes!

Wondering about childproofing your outlets and how best to go about it? The team at Hoffman Electrical has you covered! Our certified professionals take safety as our number one priority, and we can give you the lowdown on what works, what doesn’t, and how you can make your home safer for you and your children.

The question is a simple one, but the answer takes a bit of doing. There have been many types of “childproof” outlets or safety measures offered throughout the years. Some are great and work as well as anyone could hope. Others, on the other hand, are a bit lackluster.

These methods offer some protection, but don’t tend to do as well as anyone would really like:

The trouble with these solutions is that kids are super curious. Outlets are a strange, interesting thing that is right at their level and they see us fiddling with them all of the time. Bottom line, simple covers aren’t going to dissuade an inquisitive mind.

From island lighting to crystal chandeliers, 2015 marks the International Year of Light.  Make your home a haven for relaxation and a haunt for partying it up with your best friends–the right lighting design dictates the mood, so spend a little extra time mapping out your lighting plan and selecting the right light fixtures and light sources.

Ceiling fixtures from Quoizel Lighting add a festive finishing touch to this handsomely tailored den.

Never underestimate the power of a great lighting design.  For personal assistance in customizing your lighting plan, visit with a professional lighting consultant at a Capitol Lighting showroom or 1800lighting.com.