Chapter 5 of Residential Rehab explains how to inspect and evaluate residential electrical systems to determine whether they are safe, functional, and capable of meeting current and future electrical demands. It begins with an overview of the electrical system, emphasizing the importance of assessing older systems and having qualified electricians perform detailed evaluations. The chapter covers inspection of the service entry, including overhead conductors, electric meters, service entrance conductors, and service capacity. It then discusses the main panelboard, focusing on proper location, grounding, amperage and voltage ratings, overcurrent protection, and recognizing signs of overload or unsafe modifications. The final section examines branch circuits, wiring methods, grounding, GFCI protection, and acceptable wiring types such as NM, UF, AC, MC, and EMT. Special attention is given to older knob-and-tube wiring and aluminum wiring, identifying hazards, deterioration, and proper corrective measures. The chapter concludes by stressing safe installation practices, proper testing procedures, and the importance of functioning smoke detectors for occupant safety.