Contractor Safety Toolbox Talk

Contractor safety during lock out tag out can get complicated fast. Subcontractors, vendors, service techs, operators, and other trades may all be working around the same equipment or system. If each crew does not understand the LOTO plan, a lock may be missed, a valve may be opened, or equipment may be restarted while someone is still exposed.

This talk focuses on how contractors coordinate lock out tag out work on a shared jobsite. The crew needs to know who is authorized, which procedure applies, how locks and tags are controlled, and how communication will happen between contractors before, during, and after the work.

Why This Matters

• Different contractors may have different LOTO procedures, training, and equipment.
• One crew’s work can expose another crew to electrical, hydraulic, pneumatic, mechanical, gravity, thermal, or chemical energy.
• Poor coordination can lead to missed energy sources, removed locks, unclear tags, or unsafe restarts.
• Contractors must understand who controls each lockout point before work begins.
• Clear communication protects every worker, not just the crew performing the repair or service.

Common Hazards

• Starting work before confirming which contractor is responsible for the lock out tag out.
• Using one contractor’s lockout procedure when it does not match the equipment or site rules.
• Assuming another trade has isolated all energy sources.
• Removing or bypassing another contractor’s lock, tag, hasp, or lock box.
• Contractors working under someone else’s lock without approved group lockout protection.
• Vendors or service techs entering the equipment area without being added to the LOTO plan.
• Shift changes where incoming contractors do not know what is locked out or who controls the keys.
• A subcontractor connecting temporary power, air, water, fuel, or hydraulic lines to equipment another crew believes is fully isolated.

Safety Checklist

Before Work Begins

• Identify all contractors, trades, operators, vendors, and supervisors affected by the lockout.
• Review the site LOTO rules and the equipment-specific lock out tag out procedure.
• Confirm who is authorized to apply locks, tags, verify zero energy, and remove lockout devices.
• Identify every energy source and isolation point before shutdown begins.
• Decide whether group lockout, a lock box, or multi-lock hasp is required.
• Make sure each authorized contractor worker has their own lock, tag, and key.
• Communicate what equipment is locked out, why it is locked out, and what work is being performed.
• Confirm how contractors will handle testing, temporary re-energization, shift changes, and restart.

During Work

• Do not begin work until all required energy sources are isolated, locked, tagged, and verified.
• Keep each contractor’s locks and tags visible, readable, and attached to the correct control points.
• Use group lockout procedures when multiple contractors are exposed to the same hazardous energy.
• Do not remove, move, cover, bypass, or ignore another contractor’s lock or tag.
• Stop new workers, vendors, or trades from entering the work until they are briefed and protected.
• Communicate changes immediately if the task, equipment, energy source, or lockout point changes.
• Before restart, confirm all contractors are clear, tools are removed, guards are replaced, and affected workers are notified.

Crew Talking Points

• Which contractors or trades are affected by today’s lock out tag out?
• Who is coordinating the lockout between crews?
• Are all contractor workers using their own locks, tags, and keys?
• Do all crews understand the energy sources, isolation points, and verification steps?
• How will we communicate testing, handoffs, changes, and restart?
• Does anyone have a question or concern about another contractor’s work, lock, tag, or energy source?

Stop Work If

• Contractors are not clear on who controls the lockout.
• A contractor worker is exposed without personal lockout protection.
• Another crew’s lock, tag, or procedure is unclear, missing, or being bypassed.
• A new trade, vendor, or service tech enters the work without being added to the LOTO plan.
• Temporary power, pressure, fuel, water, air, or controls are connected without notifying affected contractors.
• There is confusion about whether equipment is locked out, being tested, or ready to restart.

Final Reminder

Contractor LOTO work depends on coordination. Know who controls the lockout, use your own protection, communicate changes, and never assume another crew has you covered.