The ridge part of the wire is for the third grounding hole in an electrical socket.
Replacing an electrical cord that has a ridge, no matter the color, is a little more difficult than replacing a non-rdiged electrical cord as that ridge is for the ground wire. Grounding wire is a safety precaution for higher voltage electrical components to prevent a short in the component which could bring down the rest of your home's electrical grid. When replacing this cord, properly hook up the grounding wire or else you lose any protection that a grounded wire might provide.
Instructions
1. Turn the appliance off that is connected to the power cord. Unplug the power cord from the wall and move the appliance to a well-lit area. If the appliance uses a plug-in power cable arrangement than all you will need to do is take the old cable out and put a new cable into the existing plug at the back of the appliance.
Open the appliance by removing the screws that keep on the back plate, unscrew the plug wires and remove the cord. Attach the new power cord in the same manner as you removed the previous one. If the appliance cannot be opened, move onto the next step.
2. Snip the power cable four inches away from the appliance and four inches from the plug end. Cut the plastic between the three wires inside of the power cable with a razor, separating the positive, negative and ground wires from each other four inches. Do this for both the appliance cord, the plug cord and the replacement power cord at both ends.
3. Strip one inch from each of the wires -- there will be 12 now, three for the appliance cord, three for the plug cord and six in total on the replacement cord. Twist the ground wire of the appliance end to the ground wire on the replacement cord, both will be marked white. Twist the ground wire on the plug with the free ground wire on the replacement cord, again both will be marked white.
4. Twist the remaining power wires together, matching colors -- red to red, black to black. Then wrap the raw wire with electrical tape until no more metal is visible, wrap each wire individually; do not wrap all three wires together or you will short the appliance. When all three are wrapped individually and completely covered by electrical tape, wrap them together with electrical tape, one wrap will do. Plug the cord into a surge protector and turn the appliance on to test the replacement cord.
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