Braxton's quickie for the day...
Email question: How often should I replace the lead wires for my power box?
If you are the type of person who is most comfortable with the assurance that your lead wires will always work, then replace them every six months, which presumes frequent usage.
On the other hand, you could probably save money by just keeping a spare around for the occasional failure. Seldom will you encounter complete failure...the lead wire will usually warn you first with an on / off performance, at which point it should be replaced.