An associate is labeling a residential supply-side job with modules, inverter, and battery already tagged, and must identify the remaining balance-of-system parts for the as-built: main panelboard, fused disconnect, metal conduit run, PV conductors, and breaker protection. Which statement best identifies balance-of-system parts and their roles?

The correct statement identifies the panelboard, fused disconnect, conduit, PV conductors, and breaker as balance-of-system (BOS) components. Together, these supporting parts connect equipment and route, isolate, and protect electrical circuits beyond the modules, inverter, and battery; they do not all perform the same job. A breaker is not inverter equipment: it is a circuit-protection device commonly installed in a panelboard or another suitable enclosure. PV conductors also belong in the BOS because they carry power between system components, so a list that excludes them is incomplete. A fused disconnect can provide overcurrent protection through its fuses, but that function does not mean it replaces breaker protection where a breaker is installed or required; the two can serve distinct protective or isolation roles. Identify both in the as-built when both are present. Exam caveat: BOS boundaries and required protective devices depend on system architecture and applicable electrical codes, so do not infer a device’s rating or exact circuit location from its name alone. Practical check: compare the as-built labels and one-line diagram with field-verified equipment, conductor routes, disconnect fuses, and breaker locations and ratings.