Tennessee Code Title 68. Health, Safety and Environmental Protection § 68-120-111

(1) Listed in accordance with the standards of Underwriters Laboratories, or another testing agency or laboratory accepted by the state fire marshal; and

(2) Installed in accordance with the building construction safety standards adopted pursuant to § 68-120-101 and in accordance with the manufacturer's directions, unless those directions conflict with applicable standards adopted by the state fire marshal. Notwithstanding the building construction safety standards adopted pursuant to § 68-120-101, battery-operated smoke alarms shall be permitted when installed in buildings without commercial power.