Outdoor use extension cords and many equipment cords have a tough outer layer designed to protect the inner wires. If the outer jacket is damaged, the softer inner insulation around the wires can easily become damaged. Does this mean whip out the tape to repair it? No, no, no. Damage to an extension cord jacket, or any cord for that matter, should never be fixed by wrapping it with tape. Even electrical tape does not have sufficient strength or abrasion resistance to make a permanent repair as required by OSHA. A taped-up extension or power cord to a piece of equipment is an easy OSHA citation and would make the inspector’s day.

 

So what to do if you have a damaged cord? Cut off the plug and throw it out. Replace it with a new cord. Alternatively, the cord can be cut at the point of damage and a new plug installed. If the female end is damaged, one must not use outlet boxes intended for structural use. These are not permitted if the box is designed to be surface mounted. The clue to easy identification are indentations (knockouts) on the side about the size of a nickel and small holes on the back. There are hard-walled outlet boxes that are approved for use on a flexible cord.

 

Next, where to plug it in? If you are in a wet or damp location, like almost any animal care area that gets washed down, or outside, look for outlets protected by Ground Fault Circuit Interrupters (GFCIs). GFCI are fast acting devices that detect small current leakage from electrical equipment. In other words, it senses electricity traveling to ground via something other than the wires, such as you. It shuts off the electricity within 1/40 of a second if sufficient current leakage is detected. It provides effective protection against shocks and electrocution. GFCI pigtails, very short cords with a GFCI built in, can be used with plug and cord equipment in areas without protected outlets. Although GFCI outlets are required by building codes in bathrooms, kitchens, rooftops, and garages, they are not always required near laboratory sinks. This requirement varies by locale and code enforcement authority. We think however it is a good idea and almost always recommend them on outlets within six feet of laboratory sinks.

 

Now, you are all set to go. Look for an outlet you can plug directly into. If that is not possible, choose the right cord, make sure it is in good shape, and protected from damage while in use. Remember, use GFCI protected circuits when outdoors or wet locations.

 

From Electrical Cords by the Safety Guys