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Idaho Low Voltage Practice study materials
Idaho Low Voltage Practice study resources

Idaho Low Voltage Practice: Safety, tools, and job-site practices

Idaho Low Voltage Practice · Work through your exam, one topic at a time.

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Safety, tools, and job-site practices

Scope

Safety, tools, and job-site practice questions test NFPA 70E, OSHA electrical safety, lockout/tagout, PPE, meter selection, and common job-site hazards. The exam expects you to choose the safe procedure, not just the fast one.

Core rules

  • De-energize and lock out before working on exposed conductors. Verify absence of voltage with a meter rated for the installation category.
  • Use the prove-test-prove method: test the meter on a known live source, test the circuit, then retest the meter.
  • CAT ratings matter: a CAT III meter is for distribution-level circuits; a CAT II meter is not a substitute on a 480 V feeder.
  • PPE follows the incident-energy and shock-risk assessment: voltage-rated gloves, arc-rated clothing, face shield, and insulated tools as required.
  • Use GFCI protection for temporary receptacles, inspect cords and ladders, and keep clear working space.

Worked example

A technician must verify a 480 V feeder is off. The meter must be CAT III or CAT IV rated for the location. The technician applies lockout/tagout, tests the meter on a known live source, checks phase-to-phase and phase-to-ground on all phases, then retests the meter. A non-contact voltage tester alone is not acceptable for the final verification.

Traps

Relying on a non-contact tester; using a meter with the wrong CAT rating; wearing ordinary gloves; working alone without a rescue plan; and treating 24 V as always harmless when wet or implanted connections are involved.