General Industry (29 CFR 1910)

Wiring Methods, Components, and Equipment

Verified vs OSHA sources · 2026-10-05

29 CFR 1910.305

29 CFR 1910.305 governs wiring methods, components, and equipment in general industry: flexible cords may not substitute for fixed wiring, conductors must be spliced and enclosed in approved boxes, and equipment must be properly grounded. It is where OSHA cites the everyday extension-cord and open-box hazards.

29 CFR 1910.305 at a glance

What it requires: Safe wiring methods, components, and equipment for general electrical use
Flexible cords: May NOT substitute for fixed wiring, run through walls/doorways, or be concealed in structure
Boxes & fittings: Pull/junction boxes and fittings must have covers; unused openings closed
Bonding: Metal raceways and enclosures must be effectively bonded for electrical continuity
Max penalty (2026): $16,550 per serious violation; $165,514 per willful
The #1 confusion: Extension cords are temporary: using them as permanent building wiring is a violation

What 29 CFR 1910.305 requires (plain English)

29 CFR 1910.305 sets the requirements for wiring methods, components, and equipment for general electrical use in general industry: the "how it must be installed" companion to the general requirements of 1910.303. It covers permanent wiring methods (raceways, cable, boxes, and cabinets), the proper use and limits of flexible cords and cables, and the grounding and bonding that make an electrical system safe to touch. Its purpose is to prevent shock, arcing, and fire from improperly installed or misused wiring.

One of the most-cited parts of the standard concerns flexible cords and cables (extension cords and equipment cords). Flexible cords are for temporary and portable use; they may NOT be used as a substitute for the fixed wiring of a structure, run through holes in walls, ceilings, or floors, run through doorways, windows, or similar openings, attached to building surfaces, or concealed behind building walls, ceilings, or floors. When an extension cord becomes the permanent power source for a machine or an area, it is being misused: a frequent and dangerous violation that leads to overheating, damage, and fire.

The standard also requires that boxes and fittings be sound and closed: pull boxes, junction boxes, and fittings must be provided with covers identified for the purpose, unused openings in boxes and cabinets must be effectively closed, and conductors entering boxes must be protected from abrasion. Metal raceways, cable armor, boxes, and enclosures must be effectively bonded so that they safely conduct any fault current to ground rather than energizing the metal a worker might touch. Together with 1910.303 (general requirements), these installation rules form the design side of Subpart S.

The regulatory text

“Unless specifically permitted otherwise..., flexible cords and cables may not be used: (A) As a substitute for the fixed wiring of a structure; (B) Where run through holes in walls, ceilings, or floors; (C) Where run through doorways, windows, or similar openings; (D) Where attached to building surfaces; [or] (E) Where concealed behind building walls, ceilings, or floors.”

29 CFR 1910.305(g)(1)(iv)

Key facts about 29 CFR 1910.305

Governs wiring methods, components, and equipment for general use: the installation companion to 1910.303.
Flexible cords may NOT substitute for fixed wiring, or be run through walls/ceilings/floors, doorways, or windows.
Flexible cords may NOT be attached to building surfaces or concealed behind walls, ceilings, or floors.
Pull, junction, and outlet boxes and fittings must have covers identified for the purpose.
Unused openings in boxes, cabinets, and fittings must be effectively closed.
Metal raceways, boxes, and enclosures must be effectively bonded to safely conduct fault current.
Conductors entering boxes/cabinets must be protected from abrasion, and cords protected from damage.

Scope: who 29 CFR 1910.305 applies to

Regulatory framework: General Industry (29 CFR 1910)
Citation reference: 29 CFR 1910.305
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 1910.305

#	Employer obligation
1	Use appropriate wiring methods for location
2	Protect wiring from physical damage
3	Properly support and secure conductors
4	Use approved electrical fittings and boxes
5	Maintain covers on junction boxes

Summarized from the text of 29 CFR 1910.305. Always read the full regulation for the binding language.

Common Electrical Wiring Methods violations

Deficiencies OSHA cites under 29 CFR 1910.305 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.

Flexible cords used as a substitute for fixed wiring or run through walls/doorways (1910.305(g)(1)(iv)).
Junction/pull/outlet boxes without covers, or unused openings not closed (1910.305(b)).
Damaged flexible cords (missing ground pin, cut insulation) kept in use (1910.305(g)).
Metal raceways/boxes/enclosures not effectively bonded/grounded (1910.305(g)/1910.304).
Conductors entering boxes not protected from abrasion, or cords not secured/protected (1910.305(b)).

An extension cord is not permanent wiring

The most common 1910.305 violation is treating a flexible cord (extension cord) as permanent building wiring. Flexible cords are designed for temporary, portable, or pendant use: they are not built to be run through walls and doorways, stapled to the building, hidden above ceilings, or left as the fixed feed for a machine or work area. Doing so exposes the cord to abrasion, crushing, and heat build-up (especially when coiled or run under carpet), which causes insulation failure, shock, and fire. If a cord is powering something permanently, the fix is to install proper fixed wiring, a receptacle on a branch circuit, not a longer or heavier cord. The same discipline applies to boxes: every junction box needs a cover, and every unused knockout must be closed.

What OSHA inspectors look for

A compliance officer looks for extension cords run through walls or used as permanent wiring, open junction boxes and missing knockout seals, damaged cord insulation, and missing equipment grounding. Daisy-chained power strips and cords used as building wiring are the classic findings.

Example: how a violation is cited

A shop powers a machine through a chain of extension cords run overhead as permanent wiring. OSHA cites 1910.305(g) because flexible cords cannot be used in place of fixed wiring: a common fire and shock hazard, with penalties from $16,550.

Illustrative example, not a specific OSHA case.

Electrical Wiring Methods compliance checklist

Use this to evaluate your compliance with 29 CFR 1910.305. Each item is a key requirement OSHA may verify during an inspection.

Use fixed wiring methods (raceway, cable) for permanent power, never a flexible cord as a substitute.
Do not run flexible cords through walls, ceilings, floors, doorways, or windows, or conceal them in the structure.
Provide covers for all pull, junction, and outlet boxes, and close every unused opening.
Effectively bond and ground metal raceways, boxes, and enclosures.
Protect conductors from abrasion where they enter boxes, and remove damaged cords from service.
Install proper receptacles/branch circuits where extension cords are being used permanently.

2026 penalties for 29 CFR 1910.305

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-method violations are found on nearly every industrial inspection. Serious violations reach $16,550 and willful or repeat violations $165,514; extension-cord misuse and open boxes are frequently cited together.

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 Electrical Wiring Methods compliance

Improvised wiring (cords as permanent circuits, open boxes, missing grounds) causes fires and shocks that a proper installation prevents. These are among the most frequently cited electrical hazards precisely because they are so easy to create and so easy to overlook.

Free compliance tools for 29 CFR 1910.305

LOTO Procedure Generator

Electrical Wiring Methods penalties by state

Penalties and enforcement vary by state. State-Plan states may impose higher penalties and additional requirements beyond federal 29 CFR 1910.305.

Alabama Arkansas Colorado Connecticut Delaware District of Columbia

View all 50 states + DC →

Frequently asked questions about 29 CFR 1910.305

Can extension cords be used as permanent wiring?

No. Under 1910.305(g)(1)(iv), flexible cords and cables may not be used as a substitute for the fixed wiring of a structure, run through holes in walls, ceilings, or floors, run through doorways or windows, attached to building surfaces, or concealed behind building walls, ceilings, or floors. Extension cords are for temporary and portable use; when a cord is powering something permanently, proper fixed wiring (a receptacle on a branch circuit) must be installed instead.

Do all junction boxes need covers?

Yes. Under 1910.305(b), pull boxes, junction boxes, and fittings must be provided with covers identified for the purpose, and in completed installations each outlet box must have a cover, faceplate, or fixture canopy. Unused openings (knockouts) in boxes, cabinets, and fittings must be effectively closed. Open junction boxes and unclosed knockouts expose live parts and are a common electrical citation.

What does 'effectively bonded' mean for electrical wiring?

Bonding means connecting the metal parts of the electrical system (raceways, boxes, enclosures, equipment) together and to ground so they form a low-resistance path that safely carries fault current back to the source, tripping the protective device. Under 1910.305(g) and 1910.304, metal raceways, cable armor, boxes, and enclosures must be effectively bonded to ensure electrical continuity. Proper bonding keeps the metal a worker might touch from becoming energized during a ground fault.

Why is running a cord under a carpet or through a wall dangerous?

Because flexible cords are not built for those conditions. Running a cord under a carpet traps heat and subjects it to foot traffic that crushes the insulation; running it through a wall or doorway exposes it to abrasion and pinching. Either can break down the insulation and cause a short circuit, shock, or fire. That is why 1910.305(g)(1)(iv) prohibits these uses and requires permanent power needs to be met with fixed wiring.

Regulatory history of 29 CFR 1910.305

1910.305 is part of Subpart S (Electrical), derived from the National Electrical Code (NFPA 70). Subpart S separates the installation-safety requirements (1910.302–308, including how wiring must be installed) from the safety-related work practices (1910.331–335, how workers interact with electrical systems). 1910.305 is the general-use wiring-installation core of that framework.

Related glossary terms

Key terms that appear in 29 CFR 1910.305, each with a full plain-English explainer.

GFCI Electrocution Hazardous Energy

Related guides & articles

Electrical Safety Construction Guide (OSHA & NFPA 70E)

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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