Incoming line part: Displays the incoming line source of the distribution box, which may be a single-line incoming line or multiple-line incoming lines (such as normal power supply and backup power supply), and marks the model and rated breaking current of the. Incoming line part: Displays the incoming line source of the distribution box, which may be a single-line incoming line or multiple-line incoming lines (such as normal power supply and backup power supply), and marks the model and rated breaking current of the. Electrical power enters a distribution box through the incoming lines using what we call a five-wire system. Each of these wires has a specific, non-negotiable purpose: The Phase Lines : You've got three of these bad boys – A, B, and C phases. By convention, we use yellow for A phase, green for B. If installation requires distribution system upgrades (unlikely), distribution company, at its discretion, would be allowed to apply to GNERC for direct recovery of the costs from the net metering applicant. Outgoing line. NOTES: LEGEND: 1. ALL DIMENSION ARE IN mm UNLESS OTHERWISE STATED. T PROGRAMMABLE TIMER WITH RS 232 INTERFACE UNIT 3. ALL ARCHITECTURE DETAILS TO ARCH'S APPROVAL.