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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.

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Sparks Fly Between Us and Our Customers

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4792 reviews

4.8

4792 reviews

Sparks Fly Between Us and Our Customers

Read Our Reviews

toni tones

Words can't express the glee and satisfaction I have with the work of Ricky Bobby! When I tell you this dynamic duo were the light of my world is an understatement. I 150,000 percent recommend these two for your electrical work! And the love...priceless!

sabina gavord

I just want to give a 5-star rating to Miguel Garcia and his crew for doing such an amazing job on this THREE-DAY project. Our 70-year-old house has never gotten any electrical work done to it so if these guys did was absolutely amazing. Miguel was very professional and answered all our questions no matter how many questions we had and he did it patiently and respectfully the entire time. The whole crew was very respectful and polite throughout the entire process. Thank you Sparky, thank you Miguel Garcia, and thank you to the rest of the crew for doing such a wonderful job on our house! I would definitely recommend this company to anybody else who's having electrical problems in their home.

Jerome Dixon

Team Goop was amazing! Raymond, Scott, and Savva communicated perfectly from start to finish. Made sure all request were met and explained the full process to our comfort level. Wouldn't recommend anyone else! (P.S. Fake cousins don't play fantasy. IYKYK)

Carmen Longoria

We couldn’t be any happier with the service we received today from Kevin w/Mr. Sparky plus when we called the tech was sent out the very next day. Our issue was related to a repetitive light in closet not turning on or sometimes flickering & not fully turning on. We finally decided today is the day! Electrician Kevin gave us a couple of options, explained how both options would go, and we chose the smartest option in which he replaced the faulty ballast within minutes plus necessary rewiring for using the new LED lights. These come with 10-15 yr warranty and the price was not bad at all. Thanks to Mr. sparky the issue is now solved and we look forward to having a lasting membership with them. 9/29/26 We have just had another job completed with Mr Sparky’s electrician Kevin Lafferty. We are very happy to have our new electrician taking care of all our electrical needs in our home. I feel good knowing this company sends very qualified workers that are licensed & bonded to do the work professionally and they check for Safety things we sometimes don’t remember, like checking for such things as replacing our smoke alarms and carbon monoxide detectors replaced every ten years. Kevin came and quickly took care of installation of our new ceiling fans and efficiently replaced all smoke alarms & carbon monoxide detectors. Thank you so much!

Sophia McCutchen

Mark, Miguel, and Alexi were absolutely outstanding in the job they came to do. Mark was knowledgeable, provided me options that worked best for me, and laid out expectations of next steps very clearly. When Miguel and Alexi came to do the work, he walked them through everything we discussed, and assured me he’d be available for any questions throughout. Miguel and Alexi were quick, clean, and very polite throughout the repairs. They included me in the process, and made sure I saw the job well done once it was completed. Thank you three for your help!!

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