When cables are installed and exposed to chemical solvents, what must they be?

In the context of the National Electrical Code (NEC), when cables are installed in environments where they may be exposed to chemical solvents, it is essential that the cables are resistant to chemicals. This characteristic is crucial because chemical exposure can compromise the integrity of the insulation and the overall functional capability of the cables. If cables are not resistant to chemicals, they can degrade, leading to potential failures, hazards, or safety risks in the electrical system.

Cables designed to be resistant to chemicals are formulated with materials that can withstand the harsh effects of solvents without losing their insulating properties or structural integrity. This resistance helps to ensure that the electrical system remains safe and reliable, adhering to the necessary standards for installation in susceptible environments.

Other options might suggest protective measures or specific installation requirements, but the primary focus should be on the inherent properties of the cables in question to ensure that they can withstand exposure to the chemicals they may encounter.