2.4 Energized Work Permits & Live-Dead-Live

The Energized Electrical Work Permit (EEWP)

NFPA 70E 130.2(B) requires an Energized Electrical Work Permit (EEWP) before work is performed inside the Restricted Approach Boundary or within the Arc Flash Boundary of energized electrical conductors or circuit parts. The permit is a formal authorization that documents the conditions under which energized work will be done.

A complete EEWP includes, at minimum:

• A description of the circuit/equipment and the work to be performed
• Justification for why the circuit cannot be de-energized (the two acceptable justifications are below)
• A description of the safe work practices to be used
• Results of the shock hazard analysis (approach boundaries) and arc-flash hazard analysis (incident energy or PPE category)
• The arc-flash boundary and the PPE to be worn
• Means to restrict unqualified access to the work area
• Energized work approval signatures (typically supervisor and safety officer)
• A determination that the work can be done safely

Justification for Energized Work

NFPA 70E allows energized work only when de-energizing introduces additional or increased hazards or is infeasible. The two recognized justifications are:

1. Increased hazard — De-energizing would create a greater hazard. Examples: shutting off life-support ventilation, de-energizing a hazardous-area exhaust fan that maintains a non-flammable atmosphere, or interrupting power to a volatile process that would create a runaway reaction.
2. Infeasibility — The task cannot be done with the power off. Examples: diagnostic testing (voltage measurement, current measurement, thermography), some insulation-resistance tests, and certain calibration tasks that require the equipment to be running.

Routine maintenance, convenience, or "we don't want to schedule an outage" are not valid justifications. Diagnostic testing that requires the equipment energized is the most common legitimate EEWP trigger for NETA technicians.

Trap: "Any electrical work" and "only on weekends" are common wrong answers. The permit is triggered by the boundary, not the calendar or the work type alone.

The Live-Dead-Live Verification Sequence

Before touching conductors presumed de-energized, the worker must verify the absence of voltage with an adequately rated tester. The live-dead-live sequence is the industry-standard verification:

1. Test a known live source — Verify the meter reads a voltage on a known energized circuit (e.g., the line side of the disconnect, or a nearby receptacle). This confirms the meter is functioning.
2. Test the target equipment — Verify the meter reads zero (or near zero) on each phase of the equipment presumed de-energized, phase-to-phase and phase-to-ground.
3. Re-test the known live source — Verify the meter again reads the expected voltage. This confirms the meter did not fail open-circuit during the target check (a meter with a blown fuse or failed input would read zero on both the known live and the target, giving a false "dead" indication).

The live-dead-live sequence is performed every time the worker returns to the work area after an absence, and after any change in the work condition. The tester must be rated for the voltage category (CAT III/CAT IV for industrial panels) and for the system voltage.

OSHA 1910.269 for MV/HV Work

OSHA 29 CFR 1910.269, Electric Power Generation, Transmission, and Distribution, covers work on generation, transmission, and distribution equipment at medium and high voltage. For NETA technicians testing substation or MV switchgear equipment, 1910.269 supplements the general-industry LOTO standard with rules for:

• Minimum approach distances by voltage (Tables R-6 through R-9)
• Fall protection for work on elevated structures
• Grounding for de-energized lines and equipment (temporary protective grounds — see Section 2.5)
• Hazardous energy control for employers performing work on capacitors, lines, and equipment
• Energized live work only when de-energizing is infeasible

MV Work Isolation

To prevent inadvertent re-energization during medium-voltage testing, the technician applies LOTO at the source disconnect (the upstream isolation point) and installs temporary protective grounds (TPGs) on the work side of the isolation. The combination protects against two distinct hazards: LOTO protects against re-energization by another worker or by automatic transfer schemes (ATS, autoreclose), and TPGs protect against induced voltage from adjacent energized circuits and against accidental energization by providing a low-impedance fault path that operates the source protective device. Per OSHA 1910.269 and NFPA 70E, both controls are required for MV work on de-energized lines and equipment.

Notification and the Work Permit Process

Before trip-testing a relay to an in-service breaker, the technician must notify the system operator/owner and follow the work permit process. The breaker should be racked out or the trip circuit otherwise isolated to prevent an unintended outage. This notification is part of the EEWP or the facility's switching clearance procedure, and it is a hard rule — not a courtesy.