Electrical Safety

Electricity is one of the Focus Four — and contact can be instantly fatal. Treat every circuit as live until proven otherwise.

Core protections

• Lockout/Tagout (LOTO) — de-energize, lock, tag, and verify zero energy before working on equipment.
• GFCI protection — Ground-Fault Circuit Interrupters on construction-site power protect against shock; or use an assured equipment grounding program.
• Overhead power lines — keep yourself, ladders, scaffolds, and equipment a safe distance away; assume lines are energized.
• Inspect cords and tools — no damaged insulation, missing ground pins, or wet connections.

If you're not qualified

Only qualified workers should work on or near exposed energized parts. When in doubt, stop and get a qualified person.

Going Deeper (Intermediate)

Electricity kills through electrocution, shock, arc flash/blast, and fires. Core construction rules (Subpart K):

• GFCI protection on all 120V receptacles, or an Assured Equipment Grounding Conductor Program.
• Inspect cords: no missing ground pins, no damaged insulation; no cords through doorways/standing water.
• Maintain clearance from overhead lines (10 ft up to 50kV).
• Treat every conductor as energized until tested dead.

Advanced / Pro-Level

The qualified-worker layer:

• Lockout/Tagout (1910.147 / 1926.417): de-energize, isolate, lock, tag, and verify zero energy (test the tester on a known source, test the circuit, retest the tester). One lock per worker; only the owner removes their lock.
• Arc flash (NFPA 70E): working on/near energized gear requires a shock & arc-flash risk assessment, approach boundaries, and rated arc-flash PPE (cal/cm² category). The first rule of 70E is de-energize whenever feasible — live work needs an energized work permit.
• Approach boundaries: Limited / Restricted (qualified persons only, with PPE).
• Temporary power, bonding/grounding, and proper OCPD sizing keep the rest of the site safe.

Practice Challenge

Before servicing a powered conveyor, a tech locks the disconnect and starts work. What critical LOTO step did they skip, and why is it deadly? (Answer: verify zero energy — test that the circuit is actually dead (and check for stored energy/capacitors). A locked-but-still-live or back-fed circuit has killed workers who assumed the lock meant safe.)

In Practice

An electrician assumes a circuit is dead and grabs it — but someone re-energized it. Lockout/tagout and 'test before touch' exist precisely because assumptions kill.

Common Mistakes to Avoid

• Assuming a circuit is dead without verifying
• Skipping lockout/tagout
• Working near overhead power lines without clearance

Takeaway: Treat every circuit as live: use LOTO and GFCI, keep clear of overhead lines, and leave energized work to qualified people.

⚠️ Educational overview — this is not official OSHA certification. Get OSHA 10/30 training from an OSHA-authorized trainer, and always follow your employer's safety program and current OSHA standards (29 CFR 1926 for construction).