Plugging one power strip into another, or running a power strip off an extension cord, violates OSHA rules. Daisy-chaining power strips is treated by OSHA as using listed equipment outside the conditions of its safety certification, which is a citable violation of 29 CFR 1910.303(b)(2) and can carry penalties up to $16,550 per serious violation or $165,514 per willful one.1Occupational Safety and Health Administration. OSHA Penalties
The Rule That Makes Daisy-Chaining a Violation
The controlling regulation is 29 CFR 1910.303(b)(2). It requires that any listed or labeled electrical equipment be used according to the instructions that come with its listing or labeling.2Occupational Safety and Health Administration. 29 CFR 1910.303 – General Power strips are certified by a Nationally Recognized Testing Laboratory (typically UL or Intertek) with a specific instruction attached: plug the strip directly into a permanently installed wall outlet. Not into another strip. Not into an extension cord.
OSHA spelled this out in a 2002 interpretation letter from then-Director of Enforcement Programs Richard Fairfax. UL-listed Relocatable Power Taps, the letter said, must be connected directly to a permanently installed branch-circuit receptacle and are “not to be series-connected to other RPTs or connected to extension cords.”3Occupational Safety and Health Administration. Standard Interpretation: 1910.303(b)(2) – Installation and Use of Power Taps That language covers both common forms of the practice: strip-to-strip and cord-to-strip. A 1993 interpretation reinforced that equipment used outside the scope of its approval no longer counts as “approved” under the standard.4Occupational Safety and Health Administration. All Electrical Equipment Must Be Approved
If an inspector walks in and finds one strip plugged into another, the violation exists. It doesn’t matter how little current the connected devices draw or how briefly the setup has been in place.
Why the Chain Is Actually Dangerous
Every connection point between a plug and a receptacle introduces electrical resistance. One properly mated connection adds very little. A chain of three or four adds enough that heat starts building at the junctions.
Standard wall circuits in commercial and residential buildings are typically rated for 15 or 20 amps. Chaining strips doesn’t change the circuit’s capacity, but it does concentrate heat at connection points and along cords that were never designed to carry the cumulative load of multiple downstream strips. The first cord in the chain carries the full current for every device downstream. A lightweight strip meant for a desk lamp and a phone charger can overheat well before the building’s breaker trips.
The breaker not tripping is the part people misread. Circuit breakers protect against gross overcurrent. They don’t protect against localized heat buildup at loose or overloaded connection points. A daisy chain can run warm for months, slowly degrading plastic insulation and generating the kind of heat that eventually starts a fire, all without ever pulling enough current to pop the breaker. If the breaker hasn’t tripped, that isn’t proof the setup is safe.
The Related Cord Rules That Often Get Cited Too
A separate regulation, 29 CFR 1910.305(g)(1), limits what flexible cords and cables can be used for. Extension cords are approved only for a narrow set of applications: connecting portable lamps or appliances, wiring fixtures, permitting the interchange of stationary equipment, and a handful of similar uses. The same rule explicitly bans using flexible cords as a substitute for a building’s fixed wiring, attaching them to building surfaces, running them through holes in walls, ceilings, or floors, or routing them through doorways in a way that could pinch them.5eCFR. 29 CFR Part 1910 Subpart S – Electrical
Daisy chains often trigger these routing violations at the same time. A string of strips running from a single outlet across an office to reach a distant workstation is simultaneously a prohibited series connection and a substitute for fixed wiring. That’s two citations.
Then there’s the temporary wiring rule at 29 CFR 1910.305(a)(2). It permits temporary wiring only during remodeling, maintenance, or repair; for holiday decorative lighting or carnivals up to 90 days; and for emergencies or experimental work. Otherwise, temporary wiring must be removed “immediately upon completion of the project or purpose for which the wiring was installed.”6eCFR. 29 CFR 1910.305 – Wiring Methods, Components, and Equipment for General Use The 90-day allowance is specific to decorative lighting and similar seasonal use. It is not a general grace period. The extension cord that has powered a space heater under someone’s desk since last winter doesn’t get 90 days. It gets none.
What the Penalties Actually Are
OSHA adjusts penalty amounts annually for inflation. As of 2026, a serious violation carries a maximum of $16,550 per occurrence, and a willful or repeated violation can reach $165,514 per occurrence. Failure to abate a previously cited violation adds up to $16,550 per day beyond the abatement date.1Occupational Safety and Health Administration. OSHA Penalties One inspection that finds daisy-chaining in multiple locations can generate multiple citations, because each instance is a separate occurrence.
Daisy-chaining is usually classified as serious, because the hazard (fire, electrocution) could cause death or serious physical harm. It escalates to willful when OSHA can show the employer knew and didn’t correct it. An employer who was warned during a previous inspection, or whose written safety policy prohibits daisy-chaining while staff do it openly without enforcement, is in willful territory. OSHA specifically lists “improper use of extension and flexible cords” among the most frequent causes of electrical injuries in the workplace,7Occupational Safety and Health Administration. Electrical – Overview and inspectors actively look for it on walkthroughs.
Who Gets Cited in a Shared Workplace
In office buildings, industrial parks, and other shared sites, OSHA doesn’t limit citations to whoever plugged in the offending chain. Under the multi-employer citation policy, an employer can be cited for creating the hazard, exposing employees to it, being responsible for correcting it, or controlling the worksite.8Occupational Safety and Health Administration. CPL 2-00.124 – Multi-Employer Citation Policy
A building management company that knows tenants are daisy-chaining and does nothing can be cited as a controlling employer. A staffing agency whose temps work in an area with chained strips can be cited as an exposing employer, even though the agency didn’t set up the wiring, provided it knew or should have known through reasonable diligence and failed to fix it or ask the controlling employer to fix it.8Occupational Safety and Health Administration. CPL 2-00.124 – Multi-Employer Citation Policy
Construction Sites and Healthcare Facilities
General industry standards under 29 CFR 1910 apply to offices, warehouses, factories, and most other workplaces. Construction sites are governed by a parallel set of rules under 29 CFR 1926, Subpart K. The daisy-chaining prohibition still applies through the same “used in accordance with listing” principle, and the construction rules add stricter cord-handling requirements: 29 CFR 1926.416(e) prohibits worn or frayed cords, fastening cords with staples, hanging them from nails, or suspending them by wire.9eCFR. 29 CFR 1926.416 – General Requirements Temporary wiring on a construction site must be removed as soon as the work it was installed for is finished.10eCFR. 29 CFR 1926.405 – Wiring Methods for Construction
Hospitals and other healthcare facilities operate under both OSHA and the Centers for Medicare and Medicaid Services (CMS) survey requirements. A 2014 CMS categorical waiver allows power strips in patient care areas under strict conditions, and daisy-chaining is prohibited throughout the facility regardless of location.11Centers for Medicare and Medicaid Services. Survey and Certification Letter 14-46-LSC Failing a CMS survey over power strip misuse can jeopardize Medicare certification, which is a considerably more expensive outcome than an OSHA fine.
What to Do Instead
When workers daisy-chain, they are almost always solving a real problem: not enough outlets where they need power. Unplugging the chain doesn’t fix the shortage, and the chain will be back the next day if you stop there.
The durable solution is having a licensed electrician install additional permanent receptacles. That is the only approach OSHA and the National Electrical Code fully endorse for ongoing power needs. Rates vary by region, and jurisdictions may require permits for new electrical work.
A single power strip plugged directly into a wall outlet is still legal. So is a single extension cord used for a genuinely temporary purpose within the narrow uses the rules allow. The violation is the chain itself. If one strip with enough outlets reaches from the wall to the workstation without being routed through walls or attached to building surfaces, you are compliant. The moment a second strip or a feeding extension cord enters the picture, the setup has moved past what temporary equipment can lawfully do, and the answer is a permanent electrical fix rather than another strip.