Phoenixtec 4000UL is approved by ETL SEMKO Phoenixtec 4000UL is approved by ETL SEMKO for grid-connected Distributed inverters . 4000UL inverter complies with UL1741, IEEE1547, IEEE1547.1 and CEC, especially with protection degree in accordance with NEMA type 3R enclosure, which is suitable for indoor and outdoor use. [ Back ]