Most workplace injuries in California are handled exclusively through workers’ compensation.
But Labor Code § 4558 creates one of the most important—and most misunderstood—exceptions to that rule.
When an injury involves a power press, employer immunity can disappear, allowing injured workers to pursue a civil personal injury lawsuit against their employer in addition to workers’ comp benefits.
This exception exists because power press injuries are often catastrophic, preventable, and tied to deliberate safety decisions.
What Is the Power Press Exception?
Labor Code § 4558 allows an injured worker to sue their employer in civil court when:
- The injury is caused by a power press, and
- The employer removed or failed to install a required safety guard or safety device, and
- The employer knew or should have known that the safety device was required
When these elements are met, workers’ compensation exclusivity does not apply.
What Is a “Power Press”?
A power press generally refers to industrial machines that:
- Use mechanical or hydraulic force
- Stamp, punch, form, or shape metal or other materials
- Operate with high-speed, high-force repetitive motion
Common examples include:
- Punch presses
- Stamping presses
- Mechanical or hydraulic presses used in manufacturing
These machines are inherently dangerous — which is why strict safety guard requirements exist.
Why Labor Code § 4558 Exists
Power press injuries are often:
- Amputations
- Crush injuries
- Permanent hand, finger, or arm damage
- Life-altering industrial accidents
The Legislature recognized that when employers:
- Remove guards to increase speed
- Disable safety devices to boost production
- Ignore known machine hazards
they should not be shielded by workers’ comp immunity.
Required Safety Guards and Devices
Power presses are subject to mandatory safety requirements, including:
- Point-of-operation guards
- Presence-sensing devices
- Two-hand controls
- Physical barriers
If an employer:
- Removes a guard
- Fails to install one
- Bypasses or disables a safety device
and an injury results, § 4558 may apply.
Knowledge Matters: “Knew or Should Have Known”
Employer liability under § 4558 does not require an admission of intent.
It is enough to show that the employer:
- Knew a safety device was required, or
- Should have known based on industry standards, regulations, or manufacturer instructions
This often turns on:
- OSHA regulations
- Manufacturer manuals
- Prior inspections or citations
- Training records
How the Power Press Exception Changes a Case
When § 4558 applies, an injured worker may pursue:
- Workers’ compensation benefits and
- A civil lawsuit against the employer
That civil case may allow recovery for:
- Pain and suffering
- Emotional distress
- Full wage loss
- Future earning capacity
- In some cases, punitive damages
This can increase the value of a case dramatically.
Workers’ Comp vs. Civil Lawsuit Under § 4558
| Workers’ Compensation | Power Press Lawsuit |
|---|---|
| No fault required | Fault must be proven |
| Limited benefits | Full damages available |
| No pain & suffering | Pain & suffering allowed |
| Employer immunity | Immunity removed |
Common Employer Defenses (and Why They Often Fail)
Employers frequently argue:
- The worker misused the machine
- The guard was optional
- The injury was the employee’s fault
But § 4558 focuses on employer safety decisions, not employee mistakes.
If a required guard was missing or disabled, those defenses often fall apart.
Power Press Claims Often Involve Third Parties Too
Many power press cases also involve:
- Machine manufacturers
- Maintenance companies
- Safety device suppliers
These third-party claims can exist alongside a § 4558 employer lawsuit, further expanding recovery.
Why Power Press Cases Are Fought Aggressively
Employers fight § 4558 claims because:
- They face jury trials
- Damages are uncapped
- Public safety decisions are scrutinized
- Verdicts can be substantial
That makes early investigation and evidence preservation critical.
Key Takeaway
Labor Code § 4558 is one of the most powerful exceptions to workers’ compensation exclusivity.
When employers remove or ignore required power press safety guards, they can lose immunity — and face full civil liability for devastating injuries.
These cases are complex, fact-driven, and high stakes — but when handled correctly, they provide real accountability.
Workers’ Comp vs. Personal Injury: Key Differences
| Workers’ Comp | Personal Injury |
|---|---|
| No fault required | Fault must be proven |
| Limited benefits | Full damages available |
| No pain & suffering | Pain & suffering allowed |
| No jury | Jury trial available |
Exclusivity determines which path—or both—are available.
Get Help From WIN Injury & Accident Trial Lawyers
Why Legal Representation Matters
Insurance companies often undervalue pain and suffering—offering minimal settlements that ignore your daily struggles. A skilled attorney can:
- Present powerful evidence of your emotional and physical suffering
- Retain expert witnesses to quantify your losses
- Use verdict data to justify higher multipliers or per diem rates
- Argue your case persuasively before a jury
At WIN Trial Lawyers, our team fights to ensure that your recovery reflects the full extent of your suffering—not just your bills.
At WIN Trial Lawyers, we know how personal injury claims can be can be. Victims often face mounting medical bills, lost wages, and emotional trauma. Our team has successfully taken on insurance companies and third parties, recovering millions for injured clients.
If you or a loved one has been injured in an accident, don’t leave your future in the hands of the insurance company. You need experienced trial lawyers who know how to prove liability and fight for maximum compensation.
If you or a loved one has been injured, don’t face this alone. The sooner you act, the stronger your case will be.
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Frequently Asked Questions About Labor Code 4558 (Power Press Exception)
What is California Labor Code § 4558?
Labor Code § 4558 is a narrow but powerful exception to workers’ compensation exclusivity. It allows injured workers to sue their employer in civil court when a power press injury occurs due to missing or disabled safety guards.
What is the “power press exception”?
The power press exception applies when:
- The injury was caused by a power press, and
- The employer removed, failed to install, or bypassed a required safety guard or safety device, and
- The employer knew or should have known the safety device was required
When these elements are met, employer immunity can be lost.
What qualifies as a “power press”?
A power press is typically an industrial machine that:
- Uses mechanical or hydraulic force
- Stamps, punches, or forms materials
- Operates with high-speed, high-force motion
Common examples include punch presses, stamping presses, and metal-forming presses used in manufacturing.
Are all machines considered power presses?
No. The statute applies specifically to power presses as defined by law and safety regulations. Each case requires a machine-specific analysis.
What kinds of injuries trigger Labor Code § 4558 claims?
Power press injuries are often severe and include:
- Finger or hand amputations
- Crush injuries
- Permanent nerve damage
- Loss of use of a limb
These injuries are exactly why strict safety guard requirements exist.
Does the employer have to intentionally remove the guard?
No. The law does not require proof of intent. It is enough to show that the employer:
- Removed a required guard, or
- Failed to install one, and
- Knew or should have known the guard was required
Negligence combined with knowledge is often sufficient.
What does “knew or should have known” mean?
It means the employer can be held responsible if safety requirements were clear through:
- OSHA or Cal/OSHA regulations
- Manufacturer instructions
- Industry standards
- Prior inspections or citations
Employers cannot avoid liability by claiming ignorance.
Can I still receive workers’ compensation benefits?
Yes. A § 4558 claim does not replace workers’ compensation. You may pursue:
- Workers’ comp benefits and
- A civil lawsuit against the employer
The two cases proceed on separate tracks.
What damages can I recover in a power press lawsuit?
Unlike workers’ comp, a civil lawsuit may allow recovery for:
- Pain and suffering
- Emotional distress
- Full wage loss
- Loss of future earning capacity
- In some cases, punitive damages
This can significantly increase case value.
What if my employer says I caused the accident?
Employer defenses often focus on worker error, but § 4558 centers on employer safety decisions, not employee mistakes.
If a required safety guard was missing or disabled, employee fault arguments often fail.
Does it matter if the guard was “optional”?
Yes — but only if it was truly optional. Many guards are mandatory under safety regulations or manufacturer guidelines. Employers often mislabel required guards as optional.
What if the machine was old?
Older machines are not exempt from safety requirements. Employers must still comply with applicable guard and safety standards.
Can supervisors or managers be personally liable?
In some cases, individuals involved in disabling safety devices may face personal exposure depending on their role and conduct.
Are third parties involved in power press cases?
Often, yes. Many cases also involve claims against:
- Machine manufacturers
- Maintenance or repair companies
- Safety device suppliers
Third-party claims can exist alongside a § 4558 employer lawsuit.
How common are power press exception cases?
They are less common than standard workers’ comp cases, but when they apply, they are often high-value, high-stakes cases.
Why do employers fight § 4558 claims so aggressively?
Because these cases:
- Remove workers’ comp immunity
- Allow jury trials
- Expose employers to large verdicts
- Focus on conscious safety decisions
They represent significant legal and financial risk.
Is there a deadline to bring a § 4558 claim?
Yes. Civil lawsuits are subject to strict statutes of limitation. Delay can permanently bar the claim.
What evidence is important in a power press case?
Critical evidence often includes:
- Machine manuals
- Safety guard specifications
- OSHA regulations
- Inspection and maintenance records
- Witness statements
- Photos of the machine as-used
Preserving evidence early is essential.
How do I know if my injury qualifies under Labor Code § 4558?
These cases are highly fact-specific. Determining whether § 4558 applies requires:
- Reviewing the machine
- Identifying required safety devices
- Analyzing employer knowledge
An experienced injury lawyer can assess this quickly.
What should I do after a power press injury?
You should:
- Seek immediate medical care
- Report the injury
- Document the machine and missing guards
- Preserve evidence
- Speak with a lawyer experienced in power press cases
Waiting can cost you critical rights.
Bottom Line
Labor Code § 4558 exists to hold employers accountable when production is prioritized over safety.
When required power press safety devices are removed or ignored, employer immunity can vanish — and civil liability may follow.
