What is the practical reason for maintaining required distances from heat sources when routing cables?

• A. To prevent interference
• B. To protect insulation and maintain protection from mechanical damage
• C. To improve aesthetics
• D. To simplify labeling

Answer: (B)

The main idea is to keep cables out of heat so their insulation stays in good condition and remains protected. When a cable sits near heat sources, its insulation can heat up, age faster, or even soften or melt. That weakens the insulating layer and the jacket, making the cable more vulnerable to mechanical damage like abrasion, cuts, or compression. By maintaining distance, the insulation remains within its rated temperature, the protective cover stays intact, and the risk of faults or fires due to damaged insulation is reduced. Interference, aesthetics, and labeling aren’t the primary reasons for this spacing.