OSHA requires every construction worker who faces electrical hazards to receive training in the safety-related work practices specific to their job, and only qualified persons may work on equipment that has not been deenergized and locked out.
Who on your crew needs electrical safety training?
Any employee who faces a risk of electric shock or other electrical hazards that are not reduced to a safe level by the electrical installation requirements must receive training in safety-related work practices. That is the core rule in 29 CFR 1910.332(b)(1).
On a construction site, you are managing two categories of workers. Unqualified persons are those who have not met the qualified-person standard. They still need training sufficient to recognize hazards and understand the limits of their role. An unqualified person may cross the Limited Approach Boundary only under the direct supervision of a qualified person. Otherwise, they must stay clear.
A qualified person is defined in 29 CFR 1910.399 as one who has received training in and has demonstrated skills and knowledge in the construction and operation of electric equipment and installations and the hazards involved. NFPA 70E Article 100 sharpens that definition by adding that the individual must have received safety training to identify and avoid the hazards involved. Job title alone does not make someone qualified.
Only qualified persons may work on electric circuit parts or equipment that have not been deenergized under lockout/tagout procedures per 29 CFR 1910.333(c)(2). That rule contains no voltage threshold. It applies whether the system is 120 volts or 12,000 volts. Hazards can exist below 50 volts, so do not assume low voltage means low risk.
What must OSHA electrical safety training cover?
The training must be of the classroom or on-the-job type, and the degree of training provided must be determined by the risk to the employee according to 29 CFR 1910.332(c). A laborer who sweeps near conduit needs a different level of detail than an electrician terminating gear.
For qualified persons, the training must build the depth required by 29 CFR 1910.399. That includes understanding the construction and operation of the specific equipment they will touch and the hazards involved.
Workers must know the OSHA clearance distances. Under 29 CFR 1910.333(c)(3), unqualified persons and the longest conductive object they may contact must stay at least 10 feet from unguarded energized overhead lines at 50 kV or below, plus 4 inches for every 10 kV over 50 kV. Qualified persons may not approach exposed energized parts closer than the minimum approach distances in Table S-5, including 1 foot 0 inches for circuits over 300 volts but not over 750 volts.
PPE selection is another training pillar. OSHA requires in 29 CFR 1910.335(a)(1)(i) that employees working in areas where electrical hazards are present use protective equipment that is appropriate for the specific parts of the body to be protected and for the work to be performed.
Because OSHA enforces the General Duty Clause for recognized hazards beyond the CFR, most qualified-person programs also cover NFPA 70E concepts. Workers must understand the arc flash boundary, defined as the distance where incident energy equals 1.2 calories per square centimeter. They must know how to read arc flash labels to select PPE, whether by incident energy analysis or by the NFPA 70E category tables. The tables establish four categories: Category 1 at 4 cal/cm² or less, Category 2 greater than 4 but not exceeding 8 cal/cm², Category 3 greater than 8 but not exceeding 25 cal/cm², and Category 4 greater than 25 but not exceeding 40 cal/cm². Workers must also know that undergarments worn under arc-rated gear must be non-melting, such as 100 percent cotton. Synthetic fabrics can melt to the skin even when outer layers hold.
Who is allowed to work on energized electrical parts?
Only qualified persons may work on electric circuit parts or equipment that have not been deenergized under the procedures of 29 CFR 1910.333(b). That restriction is found at 29 CFR 1910.333(c)(2), and it applies at any voltage. There is no de minimis exemption for low-voltage work.
When energized work is necessary, NFPA 70E requires an energized electrical work permit when work is performed within the restricted approach boundary or when the arc flash boundary is crossed by any part of the body. Valid justifications for energized work are limited to two conditions: de-energization creates a greater hazard, such as loss of power to life support, or the task is inherently impossible to perform de-energized, such as diagnostics and troubleshooting.
What lockout and verification procedures must workers know?
Employers must establish a specific sequence for creating an electrically safe work condition under 29 CFR 1910.333(b)(2). Your training program must teach it step by step. Workers must identify all sources of electrical supply to the equipment, open the disconnecting device for each source after load is interrupted, release stored electric energy so capacitors are discharged and high-capacitance elements are short-circuited and grounded, apply lockout or tagout devices, have a qualified person verify that the equipment cannot be restarted, and then test circuit elements and electrical parts to verify deenergization.
Testing must occur at the point of work, not merely at the disconnect. If a worker will contact conductors at a location remote from the breaker, absence of voltage must be verified at those conductors specifically. A common and dangerous misconception is that throwing a breaker is sufficient. Industry studies indicate that up to 30 percent of circuit breakers may fail to open completely. Disconnects can also be mislabeled or not control all sources, including backfeed from secondary sources or induction.
Test instruments and all associated leads, cables, power cords, probes, and connectors must be visually inspected for external defects and damage before use, and they must be rated for the circuits to which they will be connected under 29 CFR 1910.334(c). Where the circuit to be tested is over 600 volts nominal, the qualified person must functionally check the test instrument immediately before and immediately after the absence-of-voltage test under 29 CFR 1910.333(b)(2)(iv)(B). If the tester fails the post-use verification, the worker must assume the circuit was not actually deenergized and repeat the entire deenergization procedure.
Non-contact voltage detectors or proximity testers have limitations and cannot serve as the sole or primary means of verification for qualified persons establishing an electrically safe work condition. A contact-based voltmeter rated for the environment is necessary.
How often is retraining required?
OSHA does not set a fixed calendar interval for electrical safety retraining in 29 CFR 1910.332. The degree of training provided must be determined by the risk to the employee under 1910.332(c).
That said, NFPA 70E requires retraining for qualified persons at intervals not exceeding three years. The 2024 edition places this requirement under Section 110.6(A)(3). NFPA 70E also requires retraining after any incident involving an electrical hazard and when standards or work processes change.
Qualified person status is not a permanent credential. You must constantly re-evaluate skills and environmental conditions. A worker who was qualified five years ago but has not touched energized gear since is not automatically qualified today.
Are training records required by OSHA?
No. Under 29 CFR 1910.332, OSHA imposes no training-documentation or record-retention duty for electrical safety training. The only written-record duty in Subpart S is the written lockout/tagging procedure required by 29 CFR 1910.333(b)(2)(i).
Keeping training records is considered industry best practice, not a Subpart S requirement. You should still track who was trained, on what topics, and when refresher training is due.
Jobsite tracks OSHA compliance, training, certifications, and inspections for contractors. You can see exactly who on your crew is qualified, when their three-year NFPA 70E refresher is due, and whether your written lockout procedure is current. Visit the training platform.
FAQ
Does OSHA require a specific electrical safety certification?
No. OSHA does not require a specific certification. A qualified person is defined by demonstrated skills, knowledge, and training per 29 CFR 1910.399 and NFPA 70E Article 100, not by a certificate or job title alone.
Can an unqualified worker enter an electrical room?
An unqualified person may cross the Limited Approach Boundary only under the direct supervision of a qualified person. Otherwise, unqualified persons must remain outside the approach limits established for exposed energized conductors.
Is a non-contact voltage detector enough to prove a circuit is dead?
No. Non-contact voltage detectors or proximity testers have limitations and cannot serve as the sole or primary means of verification for qualified persons establishing an electrically safe work condition. A qualified person must use a contact-based voltmeter rated for the environment.
What is the difference between OSHA and NFPA 70E training rules?
OSHA's regulations in 29 CFR 1910.331 through 1910.335 are enforceable law. NFPA 70E is a consensus standard that OSHA may reference under the General Duty Clause for recognized hazards. NFPA 70E provides the three-year retraining interval and detailed PPE category tables that many employers follow to prove compliance with OSHA's performance-based requirements.
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About the author
The Jobsite Editorial Team — Construction safety & OSHA compliance
The Jobsite Editorial Team writes the safety and compliance library behind Jobsite, the construction safety, OSHA compliance, and training platform for contractors. Every article starts from the primary regulatory text — the CFR section itself, not a summary of it — and is fact-checked against that source before it publishes, so what you read here is what the standard actually requires of small and mid-size contractors in the field.