The number one use, by far, for gaffers tape is to secure cables temporarily to the floor in order to eliminate tripping hazards.
Whether you are securing audio cables to a stage or using an extension cord on carpet, taping down the cable wherever anyone might be walking is essential to making your environment safe.
Gaffers tape works so well for this application because it has a high quality synthetic adhesive that will lot leave residue on the cable or the floor when it is removed.
The Good Buy Guys have a great video that gives you tips about properly taping down cables.
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