What must be ensured before adding to or altering an installation?

Ensuring safety precautions are followed before adding to or altering an installation is crucial for several reasons. First, working with electrical systems poses inherent risks, including electrical shock, fire hazards, and damage to equipment. Therefore, following established safety procedures, such as using personal protective equipment (PPE), de-energizing circuits, and utilizing lockout/tagout systems, minimizes these risks.

Additionally, adhering to safety precautions helps to comply with regulations and standards set by governing bodies, which protect both workers and the general public. It ensures that any modifications or additions to the installation are performed in a manner that maintains the integrity of the entire system and mitigates the possibility of future issues or failures.

This principle is foundational in electrical installation and maintenance practices, emphasizing that safety is paramount and must be prioritized over all other considerations. Other options, such as ensuring installations are only partially tightened or loosely installed, would compromise the functionality and safety of the electrical system. Similarly, having the power alive during alterations or additions increases the risk of accidents and should always be avoided.