Contractor Lockout/Tagout Coordination Under OSHA 1910.147
Bring an outside crew onto your floor to service a press, a boiler, or a packaging line, and you have a second energy control program operating inside yours. The standard does not let those two programs run on separate tracks. 1910.147(f)(2) ties them together. The host has to tell the contractor how it controls hazardous energy on that equipment, the contractor has to tell the host how its crew will do the same, and the host has to make sure its own people respect the contractor's locks. When that exchange does not happen, the machine ends up protected by assumptions instead of locks. This guide covers what 1910.147(f)(2) actually requires, who owns the lock during contractor work, how multi-employer citations attach, and the handoff gaps that put a citation on both companies. It pairs with our group lockout procedures guide and the employee classification piece, because contractor coordination only works when both sides know exactly who is authorized.
What 1910.147(f)(2) Actually Requires
1910.147(f)(2) is short, and people misread it as a one-way notice. It is not. It has two halves. First, the on-site employer (the host) and the outside employer (the contractor) inform each other of their respective lockout or tagout procedures. Second, the on-site employer makes sure that its own employees understand and comply with the restrictions and prohibitions of the outside employer's energy control program.
Read those two halves together and the duty is clear. The host cannot just hand a contractor a binder and walk away. It owns an ongoing obligation to keep its production and maintenance staff from defeating the contractor's locks, restarting equipment, or reentering an isolated zone. The contractor cannot just show up and assume the host's machines match a generic procedure. Each side has information the other needs, and the standard makes the exchange mandatory.
The exchange has to be real. A line in the master service agreement that reads "contractor will comply with all applicable OSHA standards" is not the exchange. Procedures are specific to machines. The host's machine-specific energy control procedure for that exact boiler or that exact line is the document that has to change hands, the same document we cover in our machine-specific procedure guide.
Who Owns the Lock During Contractor Work
This is where most plants get fuzzy, and fuzziness on a lock is how people get hurt. The rule underneath the coordination requirement is the same rule that governs every other lockout. Each authorized employee exposed to the hazard applies their own lock and keeps the key for the duration of their exposure. A contractor technician working inside a machine is protected by the contractor technician's lock. Full stop.
Sharing hardware is allowed. The host can let the contractor use the host's hasps, the host's lockbox, or the host's group lockout system, and on many jobs that is the cleanest setup. What is never allowed is one crew relying on the other crew's lock for protection. If a host maintenance lock is the only thing on the disconnect and the host removes it at shift end, the contractor still inside the machine is now exposed and does not know it.
When both crews work the same equipment at the same time, a group lockout with a shared lockbox solves the ownership problem. Every authorized employee, host and contractor alike, hangs a personal lock on the box. The machine cannot be released until the last lock comes off. The coordination plan names who controls the box. Our group lockout guide walks the lockbox sequence in detail.
How Multi-Employer Citations Attach
OSHA's multi-employer worksite policy is the reason contractor LOTO coordination is a both-companies problem. The policy recognizes several roles, and a single hazard can put two or more employers in the citation.
| Role | Who it usually is | How the citation attaches |
|---|---|---|
| Exposing employer | The contractor whose crew is in the hazard | Its employees were exposed to uncontrolled energy |
| Creating employer | Whoever created the hazardous condition | Left a procedure gap or a defeated isolation |
| Controlling employer | The host, with authority over the site and equipment | Failed to exercise reasonable care to ensure coordination |
| Correcting employer | Whoever was responsible for fixing the condition | Did not correct a known coordination failure |
The practical takeaway. A host that thinks contractor safety is purely the contractor's problem is reading the wrong policy. As the controlling employer with authority over the floor and the machine, the host has a reasonable-care duty to verify the contractor has a compliant program and that the coordination actually occurred. When an incident happens, the inspector reads both programs and the coordination record, and the gaps land on whoever had the duty.
The Handoff Gaps That Draw Citations
Three failure patterns account for most of the 1910.147(f)(2) findings we see during gap analysis and incident review.
No documented exchange
The contractor showed up, the host pointed at the machine, work happened. Nobody exchanged written procedures, nobody signed a pre-job briefing, nobody named the authorized employees. When OSHA asks for proof the coordination occurred, there is none. A verbal "we talked about it" does not survive an inspection. The fix is a dated coordination record that names the equipment, the procedures exchanged, and the people on both sides.
Host employees defeating the contractor's lockout
A production supervisor sees a line down, does not know a contractor is inside it, and restarts it or sends someone to clear a jam. This is the exact harm 1910.147(f)(2) tries to prevent, and it is a host failure to make its own people understand and comply with the contractor's program. The fix is affected-employee notification on every contractor job, plus visible lock and tag presence the host staff are trained to never touch.
Broken continuity at shift change
The contractor crew leaves for the day with the machine still open and partially isolated, and the locks do not transfer cleanly to host maintenance or the next crew. 1910.147(f)(4) requires continuity to be maintained, and a sloppy handoff is where a machine ends up protected by a lock whose owner has gone home. The fix is a written transfer step in the coordination plan that says who holds the box across the change and how the transfer is verified.
Building a Coordination Procedure That Holds Up
Treat contractor coordination as a documented step in your energy control program, not an informal courtesy. A coordination procedure that survives an audit runs in this order.
- Pre-qualification: verify the contractor has a written 1910.147 program and trains its own authorized employees before the contract is signed.
- Procedure exchange: the host provides machine-specific energy control procedures for the equipment in scope, the contractor provides its program and the procedure it will follow.
- Pre-job briefing: a dated meeting naming the equipment, the energy sources, the authorized employees on both sides, and who controls the lockbox.
- Affected-employee notice: host production and maintenance staff are told a contractor lockout is in effect and which equipment is off limits.
- Hardware plan: whose locks, whose hasps, whose lockbox, and how group lockout applies if both crews work the same machine.
- Continuity and transfer: the written step for shift change and crew handoff so the machine is never left protected by a departing worker's lock.
- Close-out: verified removal of all locks, confirmation the machine is clear, and the signed record retained for the file.
Tie the coordination record to the people. The authorized and affected employee classification has to be clear on both sides, because the coordination plan only protects the workers it actually names. A briefing that lists "contractor crew" without names is the same specificity gap that sinks machine-specific procedures.
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Request Your AssessmentFrequently Asked Questions
What does OSHA 1910.147(f)(2) require for outside contractors?
It requires a two-way exchange. The host employer and the outside servicer must inform each other of their respective lockout or tagout procedures. The host then makes sure its own employees understand and comply with the contractor's energy control program. It is a mutual obligation, not a one-way handoff, and the exchange has to actually happen before work starts, not sit unread in a contract packet.
Who is responsible if a contractor gets hurt on the host's equipment?
Both employers can be cited under OSHA's multi-employer worksite policy. The contractor is the exposing and often the creating employer for its own crew. The host can be the controlling employer with authority over the site and the equipment. A coordination failure under 1910.147(f)(2) frequently lands citations on both, because each had a duty the other relied on.
Can a contractor use the host plant's locks and procedures?
Only if the arrangement is coordinated and documented. The standard does not forbid sharing hardware, but each authorized employee servicing the equipment still needs their own lock applied during their exposure. A contractor cannot rely on a host lock alone for protection. If both crews work the same machine, a group lockout with a lockbox is the clean way to keep every worker's lock in play.
Does the host have to train contractor employees on LOTO?
No. The contractor trains and authorizes its own employees under 1910.147(c)(7). The host's duty is to inform the contractor of the host's procedures and to make sure host employees understand the contractor's program. Training of contractor staff stays with the contractor, but the host has to verify the contractor actually has a compliant program, not just assume it does.
What documents prove contractor LOTO coordination happened?
Inspectors look for a written exchange of energy control procedures, a signed coordination or pre-job briefing record naming the equipment and the authorized employees, and the host's machine-specific procedures provided to the contractor. A purchase order that says comply with all safety rules is not coordination. The proof is a dated record that names the machine, the procedure, and the people.
How does shift change affect contractor lockout?
Continuity has to be maintained under 1910.147(f)(4). When a contractor crew hands off to host maintenance or another contractor, the locks transfer through an orderly procedure so the machine is never left protected only by a departing worker's lock. The coordination plan names who owns the lockbox across the handoff and how the transfer is verified before anyone leaves.