Monthly Archives: May 2019

What is Knob and Tube Wiring?

When the wonder of electricity started to be brought into our homes in the late 1890s, the wiring system predominately used was referred to as “knob and tube wiring”. This wiring system was just the beginning of giving our homes the ability to deliver electrical power to serve our families.

As with most things, that system has been updated and improved several times over the course of 2 centuries. But you may be surprised to learn that it still exists and continues to be used in older homes across the country.

Construction

Rubberized cloth fabric was used to insulate each hot and neutral wire separately. The wiring was then run inside wall cavities. A porcelain knob was used to hold the wire in place. Unfortunately the insulation used at that time was only capable of doing its job for about 25 years. After that time, an increasing chance of failure is caused by cracking and wear.

Grounding

One of the major problems with knob and tube wiring is the lack of grounding. Today, our home’s electrical system is grounded in order to offer us protection from unwanted power surges and short circuits.  You can find out more about “What is a ground wire?” in one of our recent blogs.

While the knob and tube wiring was an inspired innovation of its time, they did not have the information to realize what a great importance our grounding system truly is in our homes.

If your home’s electrical system is in need of an upgrade, give us a call about a home electrical inspection. Douthit Electrical has been providing Charlotte with quality electrical services since 1990.


Written by:

What is a ground wire?

A typical circuit in your home is comprised of 3 wires. The live wire, the neutral wire, and a ground wire. These 3 wires work in unison to not only deliver power, but to do so safely. You can learn why electrical wire is different colors by clicking here.

In order for an electrical circuit to do its job, it needs a complete path. The combination of a live wire and a neutral wire allows it to do that. So why have a ground wire? A ground wire is a safety precaution in case anything should happen to change that circuit.

A short circuit may occur if any part of the circuit becomes disrupted, such as a wire becoming loose or frayed. When that happens, electricity no longer follows the path it is intended and creates its own “short” cut. The ground wire is there to give the electrical current a safe secondary path to follow. Remember, electricity follows along the path of least resistance. If it can find a shorter distance to complete the circuit, it will.

3 prong cords

Have you ever wondered why most appliances and some other devices have power cords with 3 prongs? That rounded extra prong actually contains its own grounding system that, when plugged into updated outlets, provides extra protection against electrical mishaps.

You may be tempted to use 3 to 2 adaptors in homes whose outlets need updated. Keep in mind, that the risk of a future short circuit is then increased. We highly recommend that older 2 prong outlets be updated by a professional electrician.

Home Electrical Inspection

Through the years, our homes protection against electrical dangers has become more advanced. Our circuit breakers warn us, our home’s surge protection guards us, and our ground systems try to protect us.

If you think your home’s electrical system may be in need of an upgrade, give us a call about a home electrical inspection.  Douthit Electrical has been providing Charlotte with quality electrical services since 1990.


Written by: