What does RHH represent in conduction/wire insulation?

RHH stands for "Heat Resistant Rubber." This designation indicates that the insulation material used in electrical conductors is specifically formulated to withstand higher temperatures, making it suitable for applications where heat exposure is a concern. Heat resistant rubber ensures that the electrical cables maintain their integrity and performance under elevated thermal conditions, thereby reducing the risk of insulation breakdown, which could lead to electrical faults or fire hazards.

In many electrical applications, especially in environments exposed to high temperatures, the insulation needs to provide reliable protection while remaining flexible and resilient. The properties of RHH insulation make it ideal for use in various industrial and commercial settings where heat could adversely affect the performance of electrical systems. Understanding such designations is critical for fire safety inspectors, as it helps in assessing whether the materials used in electrical installations meet safety standards and are suitable for specific operational conditions.