Lockout Tagout Products and Solutions

Group Lockout/Tagout: Multi-Employee LOTO Best Practices and OSHA Requirements

Group lockout/tagout (LOTO) is required under OSHA 29 CFR 1910.147(f)(3) whenever more than one authorized employee services or maintains the same machine simultaneously. Each worker must have personal control over their own protection before work begins and retain it until their portion of the work is complete. This guide covers when group LOTO applies, how group lockout boxes and lockout hasps are configured to meet the standard, what the primary authorized employee role requires, and what the standard requires for shift-change handoffs, the requirement most facilities get wrong.

What Does OSHA 1910.147 Require for Group Lockout/Tagout?

OSHA 29 CFR 1910.147(f)(3) requires that group LOTO procedures afford each authorized employee the same protection they would receive under individual personal lockout. Three specific requirements govern every compliant setup:

  1. A primary authorized employee must be designated with overall responsibility for coordinating the group LOTO and tracking each worker’s exposure status throughout the job.
  2. Each authorized employee in the group must apply their own personal padlock to the group lockout device, a lockout box or lockout hasp, before beginning work.
  3. The machine cannot be re-energized until every individual has removed their own padlock. No one may remove another person’s lock.

The “one person, one lock, one key” principle is the enforcement basis for OSHA citations under 1910.147(f)(3). An employee whose lock is missing from the group device has no personal protection from re-energization, regardless of what others have done.

When Is Group LOTO Required Instead of Individual Lockout?

Group LOTO is required whenever more than one authorized employee works on the same equipment at the same time. The trigger is simultaneous exposure. Individual LOTO still applies on multi-isolation-point machines where a single authorized employee performs all isolation, applies all locks, and retains full personal control throughout. The moment a second authorized employee begins work on the same machine, the group lockout provisions apply.

Common Group LOTO Scenarios

Maintenance crews with multiple trades (electricians, millwrights, pipe fitters) working on the same machine simultaneously; machines with multiple energy sources serviced by different technicians; scheduled shutdowns involving both facility employees and contractors; and repair jobs that extend across shift changes.

How Does a Group Lockout Box Work?

The primary authorized employee applies individual lockout devices at each energy isolation point and places the keys inside the group lockout box. The box is then locked with one personal padlock from each authorized employee working on the machine. The equipment cannot be re-energized until every personal padlock is removed, because the isolation device keys remain locked inside.

How to Set Up a Group Lockout Box: The Compliant Sequence

  1. A primary authorized employee identifies all energy isolation points and applies a lockout device to each one.
  2. Keys to those lockout devices are placed inside the group lockout box.
  3. The primary authorized employee locks the box with their personal padlock.
  4. Each additional authorized employee applies their own personal padlock to the box before beginning work.
  5. Each employee removes only their own padlock when their work is complete.
  6. When every padlock is removed, the primary authorized employee retrieves the isolation device keys and restores energy.

How Many Isolation Points Can a Group Lockout Box Handle?

Group lockout boxes are available in configurations handling 6, 12, 20, or more isolation points. The efficiency advantage grows with complexity: a job with 12 isolation points and 5 crew members requires 60 individual lock applications using hasps at each point. The same job using a central lockbox requires 12 isolation locks plus 5 personal padlocks on the box, 17 applications total. For large shutdowns with multiple contractor crews, that difference is significant.

How Does a Lockout Hasp Work and When Should You Use One?

A lockout hasp is a multi-lock attachment placed on an energy-isolating device, such as a circuit breaker, valve, or disconnect. Each authorized employee attaches their personal padlock to the hasp. The equipment cannot be re-energized until every employee removes their lock and the hasp can be released. Most multi-lock hasps hold 6 to 13 padlocks.

Single-Point and Low-Complexity Hasp Applications

Hasps are best suited for jobs with one or two isolation points and a small crew on a short-duration repair. Three electricians working on a single circuit breaker: one hasp through the breaker handle, one isolation lock, three personal padlocks on the hasp. Each person has individual protection with no lockbox required.

Hasp vs. Group Lockout Box: Choosing the Right Device

Use a hasp when the job has one or two isolation points, a small crew of six or fewer, and no shift change is expected. Use a group lockout box when the job has three or more isolation points, a large or multi-trade crew, or work continues across shift changes. A common error is using hasps at each of 10 isolation points on a large machine with eight workers that requires 80 individual lock applications and creates 80 opportunities for a missed lock. A single lockbox cuts that to 18 applications and consolidates accountability.

The Primary Authorized Employee: Role and Accountability Under OSHA 1910.147(f)(3)(ii)(C)

OSHA 1910.147(f)(3)(ii)(C) requires one authorized employee be designated as primary. This role carries specific responsibilities beyond applying a personal lock:

  1. Identifying all energy isolation points and verifying every point is locked out before authorizing crew members to begin work.
  2. Tracking each authorized employee’s status throughout the job: who is currently working, who has completed and removed their lock, who has not yet applied theirs.
  3. Managing crew changes during the job, including workers who must leave temporarily and return.
  4. Taking overall accountability for the integrity of the group LOTO for the duration of the job.

What Happens When the Primary Authorized Employee Must Leave Before the Job Is Complete?

The primary cannot simply remove their padlock and leave if other employees’ locks remain on the device. A documented transfer of primary responsibility must occur. The outgoing primary performs a written handoff to a new designated primary, who confirms they understand the current job status, the isolation points locked out, and the workers currently under the group LOTO. The incoming primary applies their lock before the outgoing primary removes theirs. An undocumented mid-job transfer creates a compliance gap under the group LOTO provisions.

Shift-Change Handoff Procedures: What OSHA 1910.147(f)(4) Actually Requires

OSHA 1910.147(f)(4) requires that the outgoing authorized employee cannot remove their personal padlock until the incoming authorized employee has applied theirs. Both locks must be physically on the group lockout device simultaneously during the transition. There is no acceptable gap in coverage between shifts, even for minutes while one employee removes their lock and another retrieves theirs.

For example, one facility discovered during a program audit that outgoing employees routinely removed their locks before the incoming shift had applied theirs. Although no injuries occurred, the practice created an unprotected window that violated OSHA’s shift-change requirements. Updating the procedure and retraining employees eliminated the compliance gap.

The Required Simultaneous Lock Application During LOTO Shift Change

Both the outgoing and incoming employees must be physically present at the group lockout device during the handoff. The incoming employee verifies the lockout status, confirms which isolation points are locked and which tasks remain incomplete, and applies their personal padlock before the outgoing employee removes theirs. Facilities that allow outgoing employees to leave and trust incoming employees to add their locks later violate the shift-change requirements. That gap is a compliance violation regardless of whether a re-energization event occurred.

Documentation for Lockout Tagout Shift-Change Handoff

The LOTO shift-change handoff must be documented in a sign-on/sign-off log capturing: outgoing employee name and lock removal time; incoming employee name and lock application time; machine and isolation points locked out; task status at handoff; and confirmation both employees were present at the device during the transition. This log is the primary compliance evidence an OSHA inspector will request for a multi-shift LOTO job.

Multi-Employer and Contractor Group LOTO

When contractors work alongside facility employees on the same machine, OSHA 1910.147(f)(2) requires the host employer and contractors to inform each other of their respective LOTO programs and coordinate to ensure equivalent protection. A single group lockout device for the combined crew is standard practice; color-coded padlocks (one color per company) help track accountability. The host employer’s primary authorized employee coordinates the combined group LOTO, and each contractor acknowledges the host employer’s control in writing before work begins.

Multi-employer group LOTO is where many facilities’ written LOTO programs fall short: individual LOTO procedures are documented, but group LOTO for mixed crews is left to informal practice. An OSHA citation for multi-employer LOTO violations targets both parties when neither can produce a documented joint procedure.

Frequently Asked Questions About Group Lockout/Tagout

These answers cover the compliance requirements and device decisions safety coordinators most often encounter when setting up or auditing a group LOTO program.

Is group LOTO required when only two employees are working on the same machine?

Yes. The group lockout provisions apply whenever more than one authorized employee is servicing or maintaining the same equipment simultaneously. There is no minimum crew size threshold. Two authorized employees working on the same machine must each apply their own personal padlock to a group lockout device before beginning work.

Can one trusted employee hold a lock on behalf of the group?

No. The OSHA standard requires each authorized employee to apply their own personal lock and remove it only when their work is complete. Having one employee hold a lock for others removes individual personal control from every worker who did not apply their own lock. Those workers are exposed to re-energization if the lock-holder makes a unilateral decision. OSHA cites this as a group LOTO violation regardless of the trust relationship between employees.

What are the documentation requirements for group LOTO under OSHA 1910.147?

The OSHA energy control standard requires documented procedures for each machine with the potential for unexpected energization. Group LOTO procedures must address how the primary authorized employee is designated, how each crew member applies and removes their personal lock, and how shift-change continuity is maintained under the regulation’s handoff provisions. The annual inspection requirement under 1910.147(c)(6) requires documentation of who performed the inspection, the date, the equipment covered, and any deficiencies found.

What are the most common OSHA citations for group LOTO violations?

The most common group LOTO citations involve: failure to designate a primary authorized employee under 1910.147(f)(3)(ii)(C); employees not applying personal padlocks to the group device before beginning work; shift-change handoffs that leave a gap in protection; and multi-employer jobs where host and contractor LOTO procedures were not documented and coordinated. LOTO consistently ranks as #5 in OSHA’s 2026 top-10 most-cited standards.

Develop or Audit Your Group LOTO Program with Rockford Systems

A group LOTO procedure written for individual lockout and adapted informally for group work is the most common program gap RS encounters, and the one OSHA inspectors find. A compliant group LOTO program requires written procedures that address every scenario your maintenance teams face: multi-trade crews, shift changes, contractor coordination, and primary authorized employee transitions. Rockford Systems provides LOTO program development, gap analysis, and on-site procedure development workshops for industrial facilities. Rockford Systems’ Lockout Tagout product catalog also supplies Group Lockout Boxes, Lockout Hasps, and individual padlocks to equip every authorized employee with the devices their written procedures require. To evaluate your group LOTO program or develop documented group procedures, contact Rockford Systems.