Monthly Archives: August 2019

What is Electrical Insulation Resistance Testing?

Have you ever wondered what happens to all that electrical power that flows through the circuits in our homes? Well, you might be surprised. Just like us, the insulation that covers the wires running through our walls ages with time. While we’d like to think that every bit of energy reaches its destination, that is often not the case. Finding out how much escapes is where Insulation Resistance Testing comes in.

Every wire in our home is protected by some type of insulation. Not all insulation used for wiring is created equal, and can decay at different rates. A crack or imperfection along the path of our circuit can allow electricity to leak. That leakage can be insignificant or it can be dangerous to our home. Electrical Insulation testing allows us to get a good idea if electricity is leaking at a small rate or at one which should have our full attention.

Insulation Resistance Testing (IR Testing) was developed in the 1900s. It is the most basic of this type of testing and continues to be used today. In simple terms, electrical insulation is tested by submitting a certain amount of voltage into the circuit and then measuring the output at the other end. While this may sound simple, it requires a professional electrician to use their mathematical skills to use those before and after numbers.

If you think your home’s electrical wiring is outdated or not working properly, and would like to have a home electrical system inspection, check out our current specials and give us a call. Douthit Electrical has been providing Charlotte with quality electrical services since 1990.


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How to Replace an Extension Cord Plug

Heavy duty extension cords can take a lot of abuse. They can be thrown around garages, driveways and even more unfriendly places. This abuse can oftentimes cause the plugs to get bent, broken, or just unusable. Depending on the length and quality of your extension cord, you may want to consider just replacing that plug, instead of purchasing a new extension cord.

You will need a utility knife, wire cutters, phillips screwdriver, and of course, the replacement plug. When you go shopping for that plug, make sure to buy the same gauge size and rating. Take a moment to check the old plug for the sizes you want to duplicate. It may save you a trip back to the store for an exchange.

First cut off the old plug with your utility knife. Make sure neither end is plugged or attached to anything. Then take care to safely make the cut on an appropriate surface. Use that same utility knife to cut the housing to reveal the three wires. Black (power) will attach to the brass screw, white (neutral) will attach to the silver screw, and green (neutral) on the green screw.

Use the wire cutters to strip each of these wires to leave about one half inch bare. Grab the replacement plug and attach each of these wires to its own terminal by wrapping each clockwise and then tightening the individual screws. Put the plug back together and check out your work.

If you enjoyed this project, be sure to click here for other electrical “how to” instructions at our blog that you may want to tackle.

Got an electrical project that needs the expertise of a professional electrician? Check out our current special offers and give us a call. Douthit Electrical has been providing Charlotte with quality electrical services since 1990.


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