OSHA electrical standards and the law in the US

Electrical safety in US workplaces is governed by three overlapping systems. The Occupational Safety and Health Act and OSHA's standards set the duties of employers to protect workers from electrical hazards. Electrical codes, mainly the National Electrical Code adopted by states and cities, govern how installations are designed, installed and inspected, and state licensing laws decide who may do electrical work. Consensus standards, above all NFPA 70E Standard for Electrical Safety in the Workplace, describe the safe work practices that OSHA expects employers to follow. This lesson maps those systems so that you know where the rules come from.

Occupational health and safety law

The OSH Act's general duty clause, section 5(a)(1), requires every employer to provide a workplace free from recognized hazards likely to cause death or serious physical harm. OSHA's specific electrical standards are in 29 CFR 1910 Subpart S for general industry (1910.301 to 1910.399) and 1926 Subpart K for construction (1926.400 to 1926.449). Electric power generation, transmission and distribution work is covered by 1910.269 and 1926 Subpart V. Twenty-two states and territories run their own OSHA-approved state plans for private employers, which must be at least as effective as federal OSHA and sometimes go further; California's Title 8 electrical safety orders are an example.

Electrical codes and who may do electrical work

The National Electrical Code (NFPA 70) is the model code for electrical installations in the United States. It is revised every three years; the 2026 edition is the newest, but states and cities adopt editions on their own schedules, so a given site may be under the 2020, 2023 or 2026 code. Local authorities having jurisdiction issue permits and inspect installations. OSHA's Subpart S design requirements are based on older NEC concepts, and OSHA does not require compliance with the latest NEC, but local building and electrical codes do.

Electrical work is a licensed trade in most US states and many cities. Installing or altering wiring generally requires a licensed electrician or an apprentice under supervision, working for a licensed contractor, with a permit and inspection. Requirements vary by state and city, and a few states license electricians only at the local level. Unqualified workers are generally limited to simple tasks such as plugging in equipment and resetting breakers, and many employers set stricter internal rules than the law requires.

The workplace electrical safety standard

NFPA 70E Standard for Electrical Safety in the Workplace is the US consensus standard for safe electrical work practices. The current edition is the 2024 edition, revised on a three-year cycle. It covers the electrical safety program, risk assessment, establishing an electrically safe work condition, approach boundaries, arc flash risk assessment, energized electrical work permits, personal protective equipment, labeling and training. NFPA 70E is not itself an OSHA standard, but OSHA uses it to show what hazards are recognized and what protection is feasible, and citations under 1910.333, 1910.335 and the general duty clause often rely on it.

Qualified and unqualified persons

Both countries draw the same basic line. A qualified person has the training, knowledge and demonstrated skill to recognize and avoid the hazards of particular electrical equipment and tasks. Everyone else is unqualified for that task. Being qualified is not a job title: an electrician may be qualified for low-voltage panels but not for medium-voltage switchgear, and a technician may be qualified to test a specific machine but not to open a building's main distribution.

OSHA 1910.332 requires training for both groups. Unqualified persons must be trained in the electrically related safety practices needed for their jobs. Qualified persons must also be trained to distinguish exposed live parts, determine nominal voltage, and know the approach distances in 1910.333. NFPA 70E adds that qualified persons must be retrained at least every three years, and that employers must audit their work at least annually.

Shared duties

Employers must assess electrical hazards, provide safe equipment and installations, keep them maintained, train workers, set up an electrical safety program and supervise work. Supervisors must make sure the right people do the right tasks and that procedures are followed. Workers must use equipment as instructed, report damaged cords, tools and equipment, stay out of areas they are not qualified to enter, and refuse work they believe is dangerous. Suppliers must provide equipment that is certified or listed and comes with instructions.

OSHA requires electrical equipment to be approved, which normally means listed or labeled by a Nationally Recognized Testing Laboratory (NRTL) such as UL Solutions, Intertek (ETL) or CSA Group. Unlisted equipment, often bought online, is a frequent finding in inspections.

How the systems work together on a real job

Consider a contractor hired to replace lighting in a warehouse in Texas. The city or county electrical authority decides whether a permit is needed and who may do the wiring, based on the locally adopted NEC and state licensing rules. Federal OSHA decides how the work must be done safely: who is qualified under 1910.332, how equipment is de-energized and locked out under 1910.333 and 1910.147, and how far unqualified workers must stay from energized parts. NFPA 70E fills in the detail of the employer's electrical safety program, the risk assessment and the PPE. The warehouse owner, as a host employer, must also make sure its own workers stay out of the work area. Under OSHA's multi-employer policy, more than one employer on the same site can be cited for the same hazard.

Agencies also cooperate. OSHA, state licensing boards and local inspectors may all respond to a serious electrical incident: OSHA looks at the employer's procedures, training and supervision, while local electrical inspectors look at the installation, the equipment and whether licensed work was done properly. The US Chemical Safety Board and NIOSH's Fatality Assessment and Control Evaluation program also publish investigation reports that help employers learn from electrical deaths.

What the workplace standard asks of employers

The workplace electrical safety standard is organized in a way that mirrors the hierarchy of controls. It begins with the employer's electrical safety program and training. It then requires that, wherever practicable, work be done only after an electrically safe work condition has been established. Where energized work is justified, it requires a risk assessment for shock and arc flash, approach boundaries, an energized work permit for most tasks, appropriate PPE and other protective equipment, and barriers to keep unqualified people away. Annexes give guidance on calculations, labels, job briefings, lockout and the selection of PPE. Later lessons in this course explain the main parts from the point of view of a worker who is not qualified.

The standard also makes clear that its requirements apply to the employer and to employees. Employers must provide the program, the training and the equipment. Employees must follow the safe work practices and procedures they have been trained in. This shared responsibility matches the internal responsibility system that underpins occupational health and safety law in both countries.

Keeping up with change

Codes and standards change on regular cycles. The NEC and NFPA 70E are revised every three years, and state and local adoption of a new NEC edition may lag by several years. OSHA amends its standards less often, and its penalty amounts change every year. Employers should assign someone to track changes, update procedures and training, and check which edition applies on each site. Workers should not rely on old training materials without checking that they are still current.

Trade unions, contractor associations and safety organizations such as the Electrical Safety Foundation, the National Safety Council and the Associated General Contractors publish practical guidance that explains these rules for workers and supervisors. OSHA's free consultation service helps small employers find and fix hazards without penalties, and OSHA publishes electrical safety fact sheets and eTools.

Some states go further than federal OSHA. California, Washington, Oregon and Michigan, for example, run state plans with their own electrical safety orders, and several states license electricians at the state level with continuing education requirements tied to each NEC cycle. Employers working in several states must check each one.