Transformer rooms are not automatically required to be enclosed in fire-rated construction. However, there are situations in which a transformer room may require a fire-rated enclosure.

Where an electrical vault is provided for conductors and equipment operating at over 600 volts, nominal, the vault must be enclosed with a minimum 3-hour fire-rated construction in accordance with NFPA 70. The 3-hour fire-rating is permitted to be reduced to a 1-hour fire-rated construction where the vault is protected with a suppression system.

No, water is not required to be discharged every year during the annual fire pump flow test. NFPA 25 permits closed-loop flow testing every 2 out of 3 years. On the 3rd year, annual flow testing must be performed by discharging water via hose streams or to a drain or suction reservoir. In order to perform closed-loop testing, the fire pump must be equipped wit...