The answer to 'junction box replacement schedule' is that junction boxes should be inspected and replaced as needed, typically every 25-40 years. Junction boxes are an essential component of a home's electrical system, housing the connections between wires and providing a safe, protected enclosure. Over time, the materials in the box can deteriorate, connections can become loose, and the box itself may become damaged.
As a general guideline, it's recommended to have a licensed electrician inspect your junction boxes every 5-10 years and replace any that show signs of wear or damage. This can help prevent electrical issues, fire hazards, and ensure your home's electrical system remains safe and up to code.