Periodic inspections of electrical installations in homes are important for safety. Visual inspections alone are not sufficient, as wiring may look intact but still pose a fire risk. Measurements of insulation resistance are needed to detect deterioration that cannot be seen. International standards recommend inspection and testing once every 10 years at a minimum to check for aging, damage, and increased electricity usage over time that could lead to overheating and fires if defects are present. Tests should include measuring insulation resistance of wiring to check for potential faults.