Warnings WARNING: Shock Hazard. May result in serious injury or death. Turn off circuit power at circuit breaker or disconnect power at source receptacle before installing unit. WARNING: Only trained and qualified personnel should be allowed to install, replace, or service this equipment. WARNING: Installation of this equipment must comply with local and national electrical and building codes. WARNING: Fall Hazard. When working at height, observe safe practices and use a suitably-attached safety harness.