Your automobile is the perfect example of a system that will last longer with routine maintenance. Like your automobile, your electrical distribution system may let you down, just when you need it the most unless you take care of it. With a car, you know you need to take it in for periodic oil changes and tune-ups at designated intervals. Based on NETA testing and NFPA 70B guidelines, knowing when to perform periodic maintenance of the electrical system is now a no-brainer. But how often should you consider performing the equivalent of that 50K or 100K-mile “tune-up” for your electrical equipment? A good target to consider is every five years.