What does the letter 'H' indicate regarding conductor properties?

The letter 'H' in conductor properties signifies that the conductor is heat resistant to temperatures of up to 167°F (75°C). This designation is critical in selecting electrical conductors for applications where they may be subjected to higher thermal environments. Conductors rated with 'H' are designed to maintain their performance and structural integrity even when exposed to elevated temperatures, which is particularly important in scenarios involving enclosed spaces or high ambient temperatures where heat build-up could compromise the efficiency and safety of the electrical system.

Understanding this designation is essential for ensuring that the selected materials will function adequately under specific environmental conditions while mitigating risks associated with overheating, which could potentially lead to insulation failure or electrical hazards.