With thousands of homes in the "Morris Towns" without electricity, many people have been using generators to keep their refrigerators and TVs running.

But that doesn't mean everyone knows what they're doing.

Enter: New Jersey Department of Community Affairs Commissioner Lori Grifa, who issued a warning to residents regarding the potential dangers of portable generators and "backfeeding" in the aftermath of Hurricane Irene.

“Even though power may be out in your immediate area, improperly connected portable generators are capable of ‘backfeeding’ power lines thought to be inactive,” Grifa said. “In addition, as the utility’s power is restored, your portable generator and house wiring may be severely damaged from improper usage.”    

Here are some portable generator safety tips from the DCA.

• Never connect a generator directly to your home's wiring unless your home has been wired for generator use. This can cause backfeeding along power lines and electrocute anyone coming in contact with them, including lineworkers making repairs. Have a licensed electrician install the equipment necessary to safely connect emergency generators to your home.
• Always plug appliances directly into generators. Connecting the generator to your home's circuits or wiring must be done by a qualified, licensed electrician who will install a transfer switch to prevent backfeeding.
• Use heavy-duty, outdoor-rated extension cords. Make sure extension cords are free of cuts or tears and the plug has three prongs. Overloaded cords can cause fires or equipment damage.
• Ensure your generator is properly grounded.
• Never overload a generator. A portable generator should only be used when necessary to power essential equipment or appliances.
• Turn off all equipment powered by the generator before shutting it down.
• Keep the generator dry. Operate it on a dry surface. Always have a fully charged fire extinguisher nearby.
• Never fuel a generator while it is operating.
• Read and adhere to the manufacturer's instructions for safe operation. Never cut corners when it comes to safety.

The Division of Fire Safety serves as the central fire service agency in the State. The Division is responsible for the development and enforcement of the State Uniform Fire Code, as well as for implementing public education and firefighter training programs.