Does the electrical cabinet need to reserve 20% space for wiring?

20% space should be reserved for wiring in the electrical cabinet. Wiring shall conform to the requirements of the electrical schematic diagram and wiring diagram specified in the equipment design. In the overall wiring, attention should be paid to using wires far away from heating elements as far as possible. For the heating element with the heating temperature of 100℃, the distance between the conductor and the heating element should be kept above 20 mm ..