This video shows real on-site footage of electrical installation, demonstrating safe and standardized wiring methods used by professionals. In this video, we'll walk you through the process of wiring a home distribution box with a detailed connection diagram. What is Distribution Board? Distribution board. The standard electrical wire color code mandated by the National Electrical Code (NEC) is a critical safety system for licensed electricians. For typical building AC circuits (commonly up to 600 volts nominal), the NEC specifies identification rules for grounded conductors (neutral), requirements. The IEC 60446 standard, “Basic and Safety Principles for Man-Machine Interface, Marking, and Identification,” establishes global guidelines for identifying electrical equipment terminals, conductors, and wiring colors. Proper identification prevents hazards, streamlines maintenance, and ensures. Material preparation: Prepare the required circuit breakers, wires, wiring ties and other materials, and ensure that they meet the design drawings and installation requirements. The colors help us determine each wire's function and purpose. When the three-phase load is symmetrical, the vector sum of the current flowing into the neutral.