01
Unexpected startup
The equipment can move, cycle or re-energise while a person is exposed during covered servicing or maintenance.
29 CFR 1910.147
Lockout/tagout and machine servicing
A practical bridge between physical machine guarding and hazardous-energy control—so the safety concept still makes sense when someone has to enter, clean, clear, adjust or maintain the machine.
WHEN THE MACHINE STOPS BEING “NORMAL PRODUCTION”
What 1910.147 is for
The federal standard covers servicing and maintenance where unexpected energization or startup—or the release of stored energy—could injure employees. It establishes minimum performance requirements for controlling that energy.
02
Stored or residual energy
Hazardous energy may remain or reaccumulate after normal controls are turned off and needs to be addressed by the procedure.
03
Entry into danger
Work during production can fall within the standard when a worker must bypass a safeguard or place part of the body in a point of operation or associated danger zone.
DESIGN FOR BOTH STATES
Production guarding and servicing controls must meet at the access point
The fence can define the hazardous zone. The energy-control program governs covered interventions. A usable project connects the two.
Normal production
Use appropriate guarding and safeguarding devices to prevent exposure while the machine performs its intended work.
- Control access to moving hazards
- Plan material entry and exit
- Make authorized access deliberate
- Consider reset and restart behaviour
Covered servicing or maintenance
Apply the energy-control program and applicable energy-control procedure before work begins, including isolation and verification as required.
- Identify relevant energy sources
- Control stored and residual energy
- Use assigned locks or tags as applicable
- Verify isolation before intervention
PROGRAM BUILDING BLOCKS
More than hardware on a disconnect
OSHA frames the employer’s energy-control program around procedures, employee training and periodic inspections. The machinery and guarding layout should make the approved process practical to carry out.
01
Procedures
Document how covered equipment is shut down, isolated, secured, checked and returned to service, subject to the regulation’s requirements and exceptions.
02
People and roles
Authorized, affected and other employees need the training or instruction required for how the program applies to their work.
03
Periodic inspection
The program includes periodic inspection of energy-control procedures, with records and corrective follow-through as required.
04
Hardware
Provide suitable locks, tags and other isolating, securing or blocking hardware for the energy sources and procedures involved.
05
Stored energy
Relieve, disconnect, restrain or otherwise render potentially hazardous stored or residual energy safe, and address possible reaccumulation.
06
Verification
Before work starts, verify that isolation and de-energization have been accomplished in accordance with the procedure.
A BETTER PROJECT BRIEF
Questions to answer before finalizing the guard layout
These are not a substitute for an energy-control assessment. They are the practical inputs that stop access hardware, doors and isolators fighting the approved work process.
What work is performed?
List cleaning, inspection, adjustment, unjamming, tool changes, setup and planned maintenance tasks.
Where must people enter?
Map routine and exceptional access, including gates, removable panels, platforms and spaces inside the perimeter.
What energy is present?
Have competent personnel identify electrical, mechanical, pneumatic, hydraulic, thermal, gravitational and other relevant sources.
Can the process be executed?
Check whether isolators, locks, verification points and restoration steps are accessible and unambiguous in the finished layout.
COMMON QUESTIONS
Lockout/tagout and guarding FAQ
Does a perimeter guard remove the need for lockout/tagout?
No. A guard controls access during production; it does not by itself isolate energy for covered servicing or maintenance. The requirements can apply together.
Are normal production operations covered by 1910.147?
Generally not, but servicing performed during production can be covered where an employee must remove or bypass a safeguard or enter a point of operation or associated danger zone. Review the exact scope in the current standard.
What about minor tool changes and adjustments?
The standard contains a narrow exception for certain minor servicing activities during normal production when specified conditions and effective alternative protection are present. It is fact-specific and should not be treated as a blanket exemption.
Is turning off the control panel enough?
A normal stop command is not automatically energy isolation. Covered work requires control of hazardous energy through the applicable procedure and energy-isolating devices, including verification before work begins.
Can Machine Guards Direct design the energy-control program?
Our role is modular physical guarding and layout support. The employer and competent safety or engineering personnel remain responsible for the energy-control program, procedures, controls and complete machine-safety outcome.
Information is general and commercial in nature, not legal or engineering advice. Always verify the current regulation and have the site-specific program reviewed by competent personnel.
Make access work in the finished guarding system
Send the machine layout and tell us where operators and maintenance teams need to enter. We’ll help configure the physical perimeter around the real workflow.
Discuss your guarding project
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