UL/cUL Listed, California CTEP approved. Conform to ANSI C12.1 and C12.20 national accuracy standards. Revenue-grade 0.5% accuracy. Comes with a lower cover which has two 3/4" knockouts to connect the conduits. One in-inline fuse with holder is attached for you to connect hot wire A to VA of the meter. The meter is powered by VA and VN. VB and VC just take the reference of voltage from hot wire B, C. They do not need in-inline fuse. DAE Cloud Metering (2nd picture) available with DAE CC2030 Gateway. CC2030 will collect energy data from DAE electrical meters and send them to Cloud Server through Ethernet. With PC, cell phone or tablet, landlords or property managers can get access to real time data, monthly kWh and billing reports to their tenants. TOU (Time of Use) billing reports are also available. No IT guy required. Just connect wires as per a simple picture (see video) & ready to go. For existing building, hard to draw cable between electric meter (close to electric pan