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