Design requirements for electrical control cabinetLow voltage electric control cabinet of secondary lines, voltage lines minimum wire section 1.5 square, current loop minimum sectional area of 2.5 square, current loop, current transformer, ammeter, current power factor meter signal cable, current signal of transformer type meters, and so on, through the current of 5 amps. Power on the yellow, green and red, 0, blue or light blue (some are grey. Because international standards also differentiate is standard in Europe or the United States). Circuit line black line of at least 1.5 mm square, control line of 1.0 square red line AC voltage, DC voltage of 1.0 square blue line. Signal cable colour not required.