General Industry (29 CFR 1910)

Wiring Design and Protection

Verified vs OSHA sources · 2026-10-05

29 CFR 1910.304

29 CFR 1910.304 sets the wiring design and protection requirements for general industry: the path to ground from circuits, equipment, and enclosures must be permanent, continuous, and effective, receptacles in higher-risk locations such as bathrooms and rooftops must have ground-fault circuit interrupter (GFCI) protection, and circuits must have proper overcurrent protection.

29 CFR 1910.304 at a glance

What it requires: A permanent, continuous, effective ground path; GFCI protection in wet areas; overcurrent protection
Who it covers: General-industry employers
Ground rule: The path to ground must be permanent, continuous, and effective (1910.304(g)(5))
GFCI rule: Required on 125-V receptacles in bathrooms and on rooftops (1910.304(b)(3))
Max penalty (2026): $16,550 per serious violation; $165,514 per willful
The #1 confusion: A defeated or broken equipment ground silently defeats the whole protection

What 29 CFR 1910.304 requires (plain English)

29 CFR 1910.304 governs the design and protection of electrical wiring in general industry: how circuits are grounded, protected against overcurrent, and safeguarded in areas where shock risk is high. Its protections work behind the walls and inside the equipment to make a fault safe rather than deadly.

Two provisions anchor the standard. First, the equipment grounding conductor path from circuits, equipment, and enclosures to ground must be permanent, continuous, and effective, so a fault trips the breaker instead of energizing a metal surface. Second, ground-fault circuit interrupters are required on 125-volt receptacles in higher-risk locations such as bathrooms and rooftops, tripping in milliseconds when current leaks to ground. Circuits must also carry overcurrent protection sized to the conductors.

1910.304 works with the general electrical requirements (1910.303), wiring methods (1910.305), and safe work practices (1910.333), and it parallels the construction wiring-design standard (1926.404), which adds the GFCI-or-assured-grounding program for temporary power. Together they keep energized parts controlled and faults survivable.

The regulatory text

“The path to ground from circuits, equipment, and enclosures shall be permanent, continuous, and effective.”

29 CFR 1910.304(g)(5)

Key facts about 29 CFR 1910.304

The path to ground from circuits, equipment, and enclosures must be permanent, continuous, and effective (1910.304(g)(5)).
GFCI protection is required on 125-V receptacles in bathrooms and on rooftops (1910.304(b)(3)).
Circuits must have overcurrent protection sized to the conductors.
A broken or bypassed equipment ground defeats the shock protection.
A GFCI trips in milliseconds when current leaks to ground, preventing electrocution.
It works with 1910.303 (general), 1910.305 (wiring methods), and 1910.333 (work practices).
Construction's parallel is 1926.404, which adds the assured grounding program option.

Scope: who 29 CFR 1910.304 applies to

Regulatory framework: General Industry (29 CFR 1910)
Citation reference: 29 CFR 1910.304
Enforcement status: In force and enforced
Jurisdiction: Federal OSHA (29 State-Plan jurisdictions may be stricter)

State-Plan states (e.g. California, Washington, Michigan) operate OSHA-approved programs that must be at least as effective as federal OSHA and frequently impose higher penalties or additional requirements. Confirm the rule as adopted in your state.

Key requirements of 29 CFR 1910.304

#	Employer obligation
1	Use GFCI protection for wet/damp locations
2	Properly ground all electrical circuits
3	Provide overcurrent protection
4	Install wiring per NEC standards
5	Protect flexible cords from damage

Summarized from the text of 29 CFR 1910.304. Always read the full regulation for the binding language.

Common Wiring Design violations

Deficiencies OSHA cites under 29 CFR 1910.304 include the ones below, in no particular order. Distinct deficiencies can be cited as separate items, and each serious item carries up to $16,550 (2026). Broader per-instance stacking exists but is a discretionary, case-by-case OSHA enforcement policy, not an automatic multiplier.

Equipment ground path broken, bypassed, or not continuous (1910.304(g)(5)).
Missing GFCI protection on required 125-V receptacles (bathrooms, rooftops): 1910.304(b)(3).
Overcurrent devices oversized or defeated (1910.304(b)).
Ungrounded metal enclosures and equipment (1910.304(g)).
Reversed polarity or improper circuit identification (1910.304(a)).

A broken equipment ground quietly defeats the protection

The most dangerous and common wiring-design failure is a defeated equipment ground: a broken ground pin, a cheater adapter, or a bootleg ground. 1910.304(g)(5) requires the ground path to be permanent, continuous, and effective for a reason: if the ground is intact, an internal fault trips the breaker; if it is broken, the same fault silently energizes the tool's metal case and waits to shock whoever touches it. The equipment looks and runs normally right up until it electrocutes someone, which is why inspectors check grounds closely and why GFCI protection is required where the risk is highest.

What OSHA inspectors look for

A compliance officer checks that equipment grounding is continuous and effective (not relying on a broken or bypassed ground), that GFCI protection is present on required receptacles such as bathrooms and rooftops, that overcurrent devices are sized and not defeated, and that circuit identification is correct. A defeated ground pin and a missing GFCI are common findings.

Example: how a violation is cited

A worker uses a grounded tool through an adapter with the ground pin broken off, and a fault energizes the tool's metal case, shocking the worker. OSHA cites 1910.304(g) because the ground path must be permanent, continuous, and effective, with penalties from $16,550.

Illustrative example, not a specific OSHA case.

Wiring Design compliance checklist

Use this to evaluate your compliance with 29 CFR 1910.304. Each item is a key requirement OSHA may verify during an inspection.

Verify the equipment grounding path is permanent, continuous, and effective throughout circuits and enclosures.
Provide GFCI protection on 125-V receptacles in bathrooms, on rooftops, and other required locations.
Size overcurrent protection to the conductors and never defeat or oversize breakers or fuses.
Test receptacles for correct grounding and polarity, and repair broken grounds immediately.
Bond and ground metal enclosures and equipment as required.
Coordinate with 1910.305 wiring methods and 1910.333 work practices for a complete electrical program.

2026 penalties for 29 CFR 1910.304

Maximums set by 29 CFR 1903.15(d). 2026 amounts unchanged from 2025 (no CPI adjustment; OMB M-26-11). Not an increase. The 2025 OSHA penalty levels remain in effect for 2026; OSHA made no inflation adjustment for 2026. 29 CFR 1903.15 identifies January 15, 2025 as the effective reference for these amounts, while OSHA's public penalties page currently references penalties assessed after Jan. 15, 2026.

Violation type	Minimum	Maximum	When it applies
Serious	$1,085	$16,550	Substantial probability of death or serious physical harm.
Other-Than-Serious	$0	$16,550	Relates to safety/health but unlikely to cause death or serious harm.
Willful	$11,823	$165,514	Intentional, knowing, or voluntary disregard of the requirement.
Repeated	$4,256	$165,514	A substantially similar violation cited within the last 5 years.
Failure to Abate	None	$16,550/day	up to $16,550 per day; total capped at 30x the daily amount (FOM Ch.6)

Wiring-design violations appear on most industrial electrical inspections. Serious violations reach $16,550 and willful or repeat violations $165,514; broken grounds and missing GFCI protection are the usual findings.

Maximums and the willful minimum are set by 29 CFR 1903.15(d); the serious and repeated minimums are OSHA policy floors from its annual penalty adjustment memo. OSHA applies gravity-based and size, good-faith and history reductions (FOM CPL 02-00-164 Ch.6). Estimates only, not legal advice.

The business case for Wiring Design compliance

A reliable ground path and a GFCI are the two protections that turn a wiring fault from a fatal shock into a tripped circuit. When the ground is broken or a GFCI is missing in a wet area, a simple insulation failure can put line voltage on a tool's metal case and electrocute the user.

Free compliance tools for 29 CFR 1910.304

Weekly Site Safety Inspection Job Hazard Analysis Builder Inspection Action Plan

Wiring Design penalties by state

Penalties and enforcement vary by state. State-Plan states may impose higher penalties and additional requirements beyond federal 29 CFR 1910.304.

Alabama Arkansas Colorado Connecticut Delaware District of Columbia

View all 50 states + DC →

Frequently asked questions about 29 CFR 1910.304

What does 1910.304 require for grounding?

Under 1910.304(g)(5), the path to ground from circuits, equipment, and enclosures must be permanent, continuous, and effective. A reliable equipment ground ensures that an internal fault trips the circuit's overcurrent device instead of energizing a metal surface a worker could touch. A broken or bypassed ground defeats this protection.

Where does OSHA require GFCI protection in general industry?

Under 1910.304(b)(3), ground-fault circuit interrupter protection is required on 125-volt, single-phase, 15- and 20-ampere receptacles installed in bathrooms and on rooftops, among other locations. A GFCI monitors the current going out and coming back and trips within milliseconds if the difference indicates current is leaking to ground through a person.

Why is a broken equipment ground so dangerous?

Because the equipment keeps working normally while the protection is gone. With an intact ground, an internal insulation fault trips the breaker; with a broken or bypassed ground, that same fault silently puts line voltage on the tool's metal case, which will shock or electrocute the next person to touch it. That is why 1910.304 requires the ground path to be permanent, continuous, and effective.

What is the difference between 1910.304 and 1926.404?

1910.304 is the general-industry wiring-design and protection standard, and 1926.404 is its construction counterpart. Both require effective grounding and overcurrent protection, but construction's 1926.404 adds a requirement to protect workers on temporary power with either GFCI protection or a documented assured equipment grounding conductor program, reflecting the rougher, wetter conditions of a jobsite.

Regulatory history of 29 CFR 1910.304

1910.304 derives from the National Electrical Code (NFPA 70) provisions OSHA adopted for general industry, and OSHA has periodically updated it to track newer NEC editions, including expanded GFCI-protection requirements. The permanent-continuous-and-effective ground-path rule has remained the core protection against shock from equipment faults.

Related glossary terms

Key terms that appear in 29 CFR 1910.304, each with a full plain-English explainer.

Personal Protective Equipment (PPE)Hierarchy of Controls Engineering Controls Competent Person

Related guides & articles

Electrical Safety Construction: OSHA & NFPA 70E OSHA Top 10 Most-Cited Violations 2026

Related OSHA standards

29 CFR 1910.137

Electrical PPE

29 CFR 1910.268

Telecommunications

29 CFR 1910.269

Electric Power Operations

29 CFR 1910.303

Electrical General

Primary sources

OSHA figures on this page are imported from HazComFast's verified regulatory module (verified 2026-10-05 against eCFR, OSHA.gov, and the Federal Register).

This page is an educational summary, not legal advice. OSHA standards and penalty amounts change; confirm requirements against the current regulation and your applicable State-Plan before acting.

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