Balance of System

UL provides balance of system (BOS) equipment certification covering fuses, holders, combiner boxes and end products such as meters.

• UL Subject 248-19 and UL Subject 2579 for fuses
• UL 98B and UL 508I for disconnects
• UL 489B circuit breakers
• UL Subject 4248-18 and UL Subject 4248-19 for fuse holders
• UL 1741 combiner boxes