What type of compound is required to seal the end of a raceway containing conductors operating at over 1,000 volts that enters from an underground system?

The requirement for a compound to seal the end of a raceway containing conductors operating at over 1,000 volts is based on safety and performance standards. The correct choice involves using a compound that is identified for the specific purpose of sealing such electrical installations.

In this context, an "identified" compound refers to materials that have been tested and approved for use in electrical environments, particularly under conditions where high voltage is present. These compounds are designed to provide a reliable seal against moisture, dust, and other environmental factors that could compromise the integrity of the electrical system. Their identification ensures compliance with relevant codes and standards, thus promoting safety and performance reliability.

This specificity is crucial because using an inappropriate or non-identified compound could lead to electrical failures, safety hazards, or damage to the conductors due to environmental exposure. Proper sealing is essential in applications with high voltage to ensure that the insulation remains intact, and the system operates safely.