You might not need to use it often, but electrical tape is a pain to work with when you do. To make things a little easier, try dispensing it from a normal sticky tape dispenser.
Instructables user Joe Bass shows you how it's done. The ridged plastic teeth of a standard tape dispenser won't do much to cut off strips of electrical tape, so step one is to attach a razor blade in their place. (Needless to say, you'll want to be careful with the finished product.)
Once that's done, just add a small screw to keep the tape from falling off the reel, and you're good to go. For complete instructions, check out the source link.
Electrical Tape Dispencer [Instructables]