Mister Sparky® of San Antonio
12829 Wetmore Rd San Antonio, TX 78247

Circuits & Wiring Services in San Antonio

What’s Happens When I Flick the Light Switch?

When you think of the electrical wiring system of a house, you might know it consists of wires and circuits. These wires and circuits provide a 360-degree delivery of electricity from the main electrical panel to an outlet, or series of outlets that service appliances, and then flows back to the panel. The electric circuits in a standard house electrical wiring system in the United States is generally comprised of 120-volts or 240-volts.

House electrical wiring in the United States is governed by the National Electrical Code (NEC), which is published by the National Fire Protection Association (NFPA 70). As an example, the current code dictates that three-pronged, polarized receptacles are to be used in all new home construction, in addition to, outlining the use of ground fault interrupters (GFI) in locations where an electrical appliance may be subjected to moisture.

The standard household electrical outlet consists of two three-pronged receptacles. Each receptacle has a 120-volt ‘hot’ wire, a neutral wire and a ground. For higher power applications like clothes dryers, electric ranges and air conditioners, a single receptacle is used where two of the prongs are a hot wire and the third a neutral, which can be used to produce a 240-volt circuit.

The two receptacles in a common outlet receive power from the same circuit leading from the main electrical supply panel. They are wired together so that two appliances which are plugged into the receptacle receive the same voltage, but can draw different amounts of electric current. This parallel wiring is the standard for 120-volt circuits in the entire house, making possible the independent use of all appliances, supplied by the same voltage.

The wider prong on the plug will permit it to be plugged in only with the correct polarity. The narrower prong is the ‘hot’ lead and the switch to the appliance is placed in that lead, guaranteeing that no voltage will reach the appliance when it is switched off.

Interruptions in circuit wiring are not only an inconvenience, but also present fire hazards. The Consumer Product Safety Commission estimates that 50 people die every year from accidental electrocutions involving residential wiring, panel boards, circuit breakers, and outlets. Another 40 electrocutions each year involve household appliances that are connected to the wiring of homes.

By making sure you have a thorough electrical inspection completed by a qualified Mister Sparky® of San Antonio electrician before buying, selling or remodeling a home, you can help ensure your home’s electrical system operates at the highest level of safety possible. Our trained technicians can provide whole house re-wiring and evaluation of your circuits to ensure the safe delivery of electrical current within your home.

Play It Safe & Choose Mister Sparky® of San Antonio
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Sparks Fly Between Us and Our Customers

    "We had a great experience with Mister Sparky's Varick Harris who diagnosed and fixed a very tricky electrical problem for us. He was smart, personable and a pleasure to do business with. Can't ..."

    - Bartol Stone Read More

    "We called Mister Sparky and they came fast. Roberto diagnosed our entire house quickly, answered all my questions, walked me through the entire issue, and fixed everything in a timely manner. He ..."

    - David D. Read More

    "Very Professional. Courteous. Fair. Pricing. Neatly dressed, wore foot coverings over shoes to protect flooring."

    - Patricia T. Read More

    "Thomas was dispatched to my house in Royal Harbor to identify and repair what appeared to be a bad circuit. After arriving, he was quickly at work up in the attic, down in the family room, and in the ..."

    - Pud P. Read More

    "I had previously written a review on 05/01/2022 but could not locate it. I had to be sure that both Jason Wallner and Jimmy Kelling were recognized for their professionalism and satisfactory services ..."

    - Yolanda N. Read More

    "We needed a 110v outlet installed for an upcoming gas range installation.. Thanks so much, Chris & Vince, for a great job. Well done."

    - Mark & Fran I. Read More
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