Transformer Vault : A transformer vault is an underground structure or room in which power transformers, network protectors, voltage regulators, circuit breakers, meters, etc. are housed
US Department of Labor, Electric Power eTool: Glossary of Terms, Occupational Safety & Health Administration OSHA, Washington, D.C., USA 2010. https://www.osha.gov/SLTC/etools/electric_power/gl ossary.html, (OSHA/ Electr Pwr - Amer) {618}