Electrical Safety and OSHA Requirements
OSHA requirements for low voltage work center on 29 CFR 1910 Subpart S (general industry) and 1926 Subpart K (construction), plus the general duty clause and Subpart I for personal protective equipment. Candidates must understand hazard identification, the hierarchy of controls (elimination, substitution, engineering controls, administrative controls, PPE last), lockout/tagout under 1910.147, and safe work practices for energized versus de-energized work. De-energizing and verifying absence of voltage is the default; energized work requires justification and additional controls. Know the purpose of an arc flash risk assessment and incident energy labeling, and the difference between shock protection (insulated tools, gloves rated for voltage) and arc-rated clothing.
Question traps include treating low voltage as inherently safe (a 48 V DC battery plant can deliver enormous fault current and cause burns), confusing approach boundaries (limited, restricted, prohibited) with simple "keep away" rules, and forgetting that test instruments must be rated for the category of the circuit (CAT III/CAT IV ratings). Another trap: assuming lockout/tagout applies only to electricians - it applies to anyone servicing equipment with hazardous energy, including data center and BAS technicians. Also expect questions on ladder safety, confined spaces, and fall protection when working above ceilings.
Worked rule of thumb: the "test before touch" sequence - identify all energy sources, isolate, lock and tag, verify the tester on a known live source, test the conductor, re-verify the tester. If a tester cannot be proven, the circuit is not verified de-energized.
Documentation of training and PPE inspection records is frequently tested.