HOLT Electricians Practice Exam

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Dry-type transformers rated over what voltage must be installed in a vault?

25,000 volts
35,000 volts
50,000 volts
60,000 volts

The correct answer is: 35,000 volts

For dry-type transformers, the requirement to install them in a vault is specifically focused on safety, fire prevention, and protection from damage. The threshold for requiring a vault for dry-type transformers is based on voltage, with 35,000 volts being the standardized limit. When transformers operate above this voltage, the potential risks associated with electrical failure or fire hazards increase significantly, necessitating additional protective measures. Vault installations help contain any potential incidents, providing a barrier that mitigates the risk of fire and protecting surrounding structures and individuals. This requirement aligns with safety codes and industry standards designed to ensure the safe operation of electrical equipment. Therefore, recognizing that 35,000 volts is the voltage threshold for the installation of dry-type transformers in a vault reflects a key understanding of electrical safety protocols.