What is one of the first rules when dealing with electrical wires and equipment?

When dealing with electrical wires and equipment, one of the first rules is to assume they are energized. This principle is critical for ensuring safety when working with or near electrical systems. Assuming that equipment is energized means that precautions must be taken as if there is an active electrical current flowing through the wires. By adopting this mindset, individuals can prevent accidental electrocution, electrical burns, or other dangerous situations that could arise from assuming that equipment is safe or off without verification.

This approach is particularly important because electrical systems can sometimes have unexpected faults, or disconnecting methods may not work as intended, leaving wires live even when they appear to be inactive. Maintaining this caution helps reinforce best practices in electrical safety, including proper lockout/tagout procedures to ensure that energy sources are properly controlled during maintenance or repair work.