Electrical Safety in the Workplace: OSHA Requirements

Most general industry employers aren't electrical contractors, but they still have significant electrical compliance obligations. The equipment your workers use every day — machinery, tools, extension cords, electrical panels — is governed by OSHA's electrical standards. The violations that show up most in general industry inspections aren't about complex electrical systems; they're about clearance in front of panels, damaged cords, missing knockouts, and unqualified workers opening electrical enclosures.

Two Different Standards

OSHA has separate electrical standards for general industry and construction:

• 29 CFR 1910 Subpart S — General Industry. Covers electrical systems and equipment in manufacturing, warehousing, healthcare, retail, and other non-construction workplaces.
• 29 CFR 1926 Subpart K — Construction. Covers electrical safety on construction sites, including temporary power and work near overhead lines.

If you're a manufacturer, warehouse operator, or any non-construction employer, Subpart S is your standard. If you're a contractor doing construction work, Subpart K applies on the site — and Subpart S may apply in your shop or office.

Qualified vs. Unqualified Workers

OSHA's electrical standards distinguish between qualified and unqualified workers, and the distinction matters for what tasks each can perform.

A qualified worker has received training in safety-related work practices and has demonstrated skills and knowledge related to the construction and operation of electrical equipment. Qualified workers can work on or near energized electrical equipment within established safety boundaries.

An unqualified worker has not received that training. Unqualified workers must maintain safe clearance distances from energized electrical parts and are not permitted to open electrical enclosures, work on energized systems, or perform electrical maintenance.

This matters for general industry employers whose maintenance workers occasionally open electrical panels to reset breakers or troubleshoot. If those workers haven't received formal electrical safety training, they're unqualified — and unqualified workers should not be opening energized panels.

Electrical Panel Requirements

Working space clearance (1910.303(g)(1))

The most commonly cited electrical violation in general industry isn't about complex wiring — it's about stuff stored in front of electrical panels. OSHA requires clear working space in front of all electrical equipment requiring examination, adjustment, servicing, or maintenance while energized. The minimum dimensions are:

• Depth: 3 feet in front of the panel (for equipment rated 150 volts to ground or less) — measured from the front of the panel enclosure
• Width: At least 30 inches, or the width of the equipment if wider
• Height: At least 6½ feet above the working space floor

Storage in front of electrical panels is prohibited. Shelving, equipment, boxes, furniture — all of it must stay out of the required working space. This is one of the most consistent findings during general industry inspections precisely because it's easy to overlook when storage space is limited.

Panel covers and knockouts

Electrical panels must be kept closed. Open knockouts — the circular holes in panel enclosures where conduit entries haven't been installed — allow access to energized components and are a violation. Plug unused knockouts with appropriate inserts. Panel covers and doors must be kept closed and latched except during authorized maintenance.

Labeling

Circuit breakers must be legibly identified as to their purpose or use — a panel with blank or illegible labels creates problems both for safe operation and for emergency response. OSHA requires that each disconnecting means be legibly marked to indicate its purpose unless it's located so that its purpose is evident.

GFCI Requirements

Ground fault circuit interrupters (GFCIs) detect imbalances between current flowing in and out of a circuit and trip within milliseconds — fast enough to prevent electrocution in many situations. OSHA requires GFCI protection in specific locations:

• All 125-volt, single-phase, 15- and 20-ampere receptacles in bathrooms, rooftops, and certain other wet or damp locations
• Temporary power in construction (all temporary receptacles)
• Areas where portable electric tools are used in proximity to water

In general industry, OSHA's GFCI requirements are less prescriptive than in construction, but employers are required to protect workers from electrical shock in wet or damp work areas. Assured equipment grounding conductor programs are an alternative to GFCI protection for some situations, but they require documented inspection and testing procedures.

Extension Cords

Extension cord violations are common across almost every industry. The rules:

• Extension cords must not be used as permanent wiring — they're for temporary use only
• Extension cords must be rated for the load they carry
• Cords must be inspected before each use — damaged cords with cuts, fraying, cracked insulation, or damaged plugs must be removed from service and repaired or discarded
• Three-prong grounded plugs must not be modified to fit two-prong outlets by removing the ground prong
• Extension cords must not be run through walls, ceilings, or floors, or under doors or floor coverings where they can be pinched or damaged
• Cords must not be secured with staples, hung on nails, or suspended by wire

A workplace where extension cords run under rugs, through walls, or have been in place for years as "temporary" wiring has visible, citable violations that an inspector will document during any walk-around.

Grounding Requirements

Electrical equipment must be grounded to provide a safe path for fault current and reduce the risk of electrical shock. Specifically:

• All metal parts of electrical equipment that could become energized must be grounded
• Frames and metal enclosures of motors, controllers, and other equipment must be grounded
• Grounding conductors must not be modified, bypassed, or disconnected
• Equipment must not be used if the grounding plug is damaged or missing

Lockout/Tagout for Electrical Equipment

Electrical energy is the most common energy type covered by OSHA's Lockout/Tagout standard. Before any maintenance on electrical equipment — resetting, cleaning, unjamming, or any task that requires removing guards or reaching into machinery — the equipment must be de-energized and locked out. This applies even if the task seems quick. See our full LOTO guide for the complete requirements.

A point that causes confusion: turning a machine off at the control switch is not lockout. The energy isolating device must be locked — the breaker thrown and locked, the disconnect opened and locked. Turning the machine off and beginning work without locking the energy isolating device is not compliant and is not safe.

Arc Flash in General Industry

Arc flash — a sudden release of electrical energy through the air — is primarily addressed in NFPA 70E rather than in OSHA's standards directly, but OSHA uses 70E as the benchmark for what constitutes adequate electrical safety practice for energized work. General industry employers whose workers perform any energized electrical work should evaluate their arc flash exposure and ensure appropriate PPE and safe work practices are in place.

For most general industry employers, the practical answer is that workers should not be performing energized electrical work at all — equipment should be de-energized and locked out before maintenance. When energized work is unavoidable, it requires a qualified worker, an energized work permit, and arc-rated PPE appropriate to the incident energy level.

Common Electrical Violations in General Industry