What kind of gloves do I need for working around electrical wires?
If the electricity has been turned off, and you have confirmed it's off via a non-contact tester, multi-meter, or some other method, then you don't need gloves to protect yourself from electrocution - there should be no risk if you've actually confirmed it's off. I even go as far as to put a piece of tape over the breaker so someone doesn't walk by and flip it back on.

I sometimes wear gloves to protect my hands from scrapes and cuts - any work glove you find comfortable for the job should work.

As DA01 said in a comment, a glove that would protect you from shock would likely make working with the wire/cable we find in residential difficult. They do however make insulated tools which can be used when working on live gear. Best to just turn the power off and not worry.