Safety, Standards, and Industry Best Practices
Core concepts
Safety underpins every task. Know electrical hazards: shock, arc flash, and burns, and the role of lockout/tagout, personal protective equipment, and verifying absence of voltage. Understand grounding and bonding for personnel and equipment protection, and the purpose of overcurrent protection. Recognize the importance of following applicable codes and standards, manufacturer instructions, and site procedures, and of using the right tool for the job. Practice good housekeeping, proper ladder and lift use, and safe handling of batteries and chemicals. Know that standards exist to ensure interoperability, safety, and quality, and that deviations require documented justification.
Traps
Questions test whether you verify de-energization rather than assume it, and whether you treat PPE as optional under time pressure. Another trap is confusing bonding (equalizing potential) with grounding (earth reference). Watch for items that imply a shortcut is acceptable because a task is routine.
Worked example
Before servicing a panel, apply lockout/tagout, then verify absence of voltage with a tested meter on the correct setting. Rule of thumb: test the meter on a known live source before and after the absence-of-voltage check to confirm the instrument works. Never rely on a breaker position alone as proof of de-energization.