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It’s possible to distinguish a positive black wire from a negative black wire if you know what type of circuit the wires are in. If it’s an alternating current (AC), then black wires are positive. If it’s a direct current (DC), then black wires are negative. 

Sometimes, a circuit has two black wires. In that case, the positive black wire will be solid black while the negative black wire will have a white stripe on it. If you’re still unsure, you can use a multimeter to check.

Yes, electricians must be licensed, certified, and in most cases, insured. Licensing requirements vary by state and local municipality, but most U.S. municipalities require electricians to hold an electrical contractor’s license. It's always a good practice to confirm requirements with your local municipality. Even if licensing is not required in your area, hiring a licensed and experienced electrician often leads to a better end result.

A license is a legal requirement to operate a business and is necessary for pulling project permits. Certifications, on the other hand, are typically voluntary and demonstrate a certain level of expertise. In some cases, a certified electrician may send an apprentice or journeyman to perform the work, but they must operate under a primary electrician who holds the proper license.

Before hiring, you should verify the electrician's license, insurance coverage, and any third-party certifications. You can use Angi’s contractor licensing search to confirm a pro's license status. Additionally, businesses with the “Angi Approved” badge on our platform meet strict criteria, including having the required state and local licenses, passing a background check, and maintaining a high average rating.

If you've ever tried to run your dishwasher while drying your hair, you’ll understand why dedicated circuits are essential for preventing blown fuses. Appliances that require more electricity than the circuit can handle could blow fuses, trip breakers, overheat, and risk an electrical fire. 

Having a dedicated circuit ensures that your appliance gets the current it needs without overloading the other circuits in your home.

Buying a house with aluminum wiring requires careful consideration due to potential fire risks. Ensure a thorough inspection by a licensed electrician to assess the condition and identify necessary safety upgrades—factor in these additional costs when deciding. While it may not be a total deal-breaker, understanding the risks and required maintenance is necessary. Also, you should consult your insurer about coverage for homes with aluminum wiring to know whether the house is insurable.