8.3 Defining Mobile Equipment, Impaired Property & Your Work/Product
Key Takeaways
Mobile equipment is defined in Section V through six specific land vehicle categories designed primarily for off-road use or carrying specialized machinery, distinct from 'autos' designed for travel on public roads.
The critical boundary between CGL and Commercial Auto establishes that mobile equipment operated on a job site falls under CGL Coverage A, whereas mobile equipment being transported by or towed behind an auto is excluded under CGL and covered under Commercial Auto.
Impaired property is tangible property other than the insured's product or work that cannot be used or is less useful because it incorporates the insured's defective product/work or unfulfilled contract, provided it can be restored to full use simply by repairing, replacing, or removing the insured's work or fulfilling the contract.
The definitions of 'your product' and 'your work' broadly encompass goods manufactured, sold, handled, or work performed by or on behalf of the named insured (including subcontractors), along with warranties, representations, and instructions.
8.3 Defining Mobile Equipment, Impaired Property & Your Work/Product
To establish clear underwriting boundaries between commercial liability policies, business risk exclusions, and commercial auto forms, the ISO Commercial General Liability policy relies on three interlocking sets of definitions in Section V: "Mobile Equipment" versus "Auto," "Impaired Property," and "Your Product" versus "Your Work." These definitions determine whether liability arising from specialized machinery belongs on a CGL or a commercial auto policy, whether economic loss of use is covered or excluded as an uninsurable business risk, and whether subcontractor operations preserve coverage for completed construction defects.
1. "Mobile Equipment" (Section V.12) vs. "Auto" (Section V.2)
A persistent challenge in casualty risk management is distinguishing between a vehicle classified as an "auto" and a piece of machinery classified as "mobile equipment." The distinction determines which policy must respond:
- Commercial General Liability (CG 00 01): Covers liability arising from the ownership, maintenance, or use of mobile equipment.
- Commercial Auto Coverage Form (CA 00 01): Covers liability arising from the ownership, maintenance, or use of autos, while CGL Exclusion g strictly excludes auto liability.
The Definition of "Auto" (Section V.2)
Under Section V, Definition 2, an "auto" means:
"a. A land motor vehicle, trailer or semitrailer designed for travel on public roads, including any attached machinery or equipment; or"
"b. Any other land vehicle that is subject to a compulsory or financial responsibility law or other motor vehicle insurance law where it is licensed or principally garaged."
"However, 'auto' does not include 'mobile equipment'."
Crucially, if a state motor vehicle licensing law requires a vehicle to be registered and carry automobile liability insurance to operate on public highways, that vehicle is classified as an "auto" under the CGL, regardless of its physical characteristics.
The Six Categories of "Mobile Equipment" (Section V.12)
Section V, Definition 12 defines "mobile equipment" as any land vehicle (including any attached machinery or equipment) that meets any of the following six distinct categories:
- Off-Road Vehicles: Bulldozers, farm machinery, forklifts, and other vehicles designed for use principally off public roads.
- On-Premises Vehicles: Vehicles maintained for use solely on or next to premises owned or rented by the named insured (e.g., an unlicensed utility cart used exclusively within a lumber yard).
- Crawler Tread Vehicles: Vehicles that travel on crawler treads (e.g., tracked excavators, tracked bulldozers, or tracked cranes).
- Permanently Mounted Heavy Construction Machinery: Vehicles, whether self-propelled or not, maintained primarily to provide mobility to permanently mounted power cranes, shovels, loaders, diggers, or drills; or road construction or resurfacing equipment (such as asphalt pavers, road graders, scrapers, or steamrollers).
- Non-Self-Propelled Specialized Equipment: Vehicles not described in categories 1–4 that are not self-propelled and are maintained primarily to provide mobility to permanently attached specialized equipment, including air compressors, pumps, generators, spraying equipment, welding apparatus, building cleaning gear, geophysical exploration equipment, lighting plants, well-servicing equipment, or cherry pickers and similar devices used to raise or lower workers.
- Other Non-Transport Vehicles: Vehicles not described in categories 1–4 that are maintained primarily for purposes other than the transportation of persons or cargo. Important Limitation: Self-propelled vehicles with the following permanently attached equipment are autos, not mobile equipment: equipment designed primarily for snow removal, road maintenance (but not construction or resurfacing), or street cleaning; cherry pickers and similar devices mounted on an automobile or truck chassis and used to raise or lower workers; and air compressors, pumps, and generators, including spraying, welding, building cleaning, geophysical exploration, lighting, and well servicing equipment.
Overriding rule: "Mobile equipment" does not include any land vehicle subject to a compulsory or financial responsibility law or other motor vehicle insurance law where it is licensed or principally garaged. Such vehicles are autos.
The Critical Coverage Boundary: Transit vs. Site Operation
The interaction between CGL Exclusion g (Aircraft, Auto or Watercraft) and the mobile equipment definition creates a clear coverage boundary based on how the machinery is moving:
┌────────────────────────────────────────────────────────────────────────┐
│ MOBILE EQUIPMENT COVERAGE MATRIX │
├────────────────────────────────────────────────────────────────────────┤
│ 1. Operation at the Job Site: │
│ • Bulldozer excavating a trench strikes an underground gas line │
│ ► COVERED under CGL Coverage A (Mobile Equipment) │
│ │
│ 2. Self-Propulsion Across a Road Between Adjacent Worksites: │
│ • Tracked excavator drives 50 feet across a road to adjacent lot │
│ ► COVERED under CGL Coverage A (Unless required to be auto-reg.) │
│ │
│ 3. In Transit On, Carried By, or Towed Behind an Auto: │
│ • Backhoe loaded onto a flatbed trailer towed by a dump truck; │
│ backhoe shifts during transit, falling off and crushing a car │
│ ► EXCLUDED under CGL Exclusions g and h(1) │
│ ► COVERED under Commercial Auto Policy (CA 00 01) │
└────────────────────────────────────────────────────────────────────────┘
When mobile equipment is being transported on, carried by, or towed behind an auto owned, operated, rented, or borrowed by an insured, any bodily injury or property damage arising from that transit is treated as an auto loss, excluded under the CGL and covered under the commercial auto policy. Exclusion h(1) removes the transportation of mobile equipment by such an auto, and Exclusion g removes the use of the towing auto itself.
2. Defining "Impaired Property" (Section V.8)
One of the most complex concepts in commercial casualty underwriting is "impaired property." The term appears in Exclusion m (Damage to Impaired Property or Property Not Physically Injured), which reinforces the principle that CGL insurance covers accidental tort damage to third parties, not the insured's failure to perform contractual specifications.
The Four-Part Definitional Test of Impaired Property
Under Section V, Definition 8, property qualifies as "impaired property" only if all four of the following conditions are satisfied:
- Tangible Property Other Than Your Product or Work: It must be tangible property belonging to a third party (e.g., finished machinery, a building, or an assembled product).
- Inoperable or Less Useful: The property cannot be used or is rendered less useful.
- Causation: The loss of use occurs because:
- It incorporates "your product" or "your work" that is known or thought to be defective, deficient, inadequate, or dangerous; OR
- You failed to fulfill the terms of a contract or agreement.
- The Restoration Condition (The Decisive Test): The property can be restored to complete utility simply by the repair, replacement, adjustment, or removal of "your product" or "your work," or by your fulfilling the contract.
┌────────────────────────────────────────┐
│ Third-Party Tangible Property Unable │
│ to Function Due to Insured's │
│ Defective Component Part │
└───────────────────┬────────────────────┘
│
Can the property be restored to use
SIMPLY by repairing, replacing, adjusting,
or removing the defective component?
│
┌────────────────────┴────────────────────┐
▼ ▼
YES: NO:
Property is IMPAIRED PROPERTY Physical Injury Occurred or
Loss of use is EXCLUDED Property Cannot Be Restored
under CGL Exclusion m Loss is COVERED Property Damage
Impaired Property vs. Covered Property Damage: Realistic Case Study
To illustrate the boundary between excluded impaired property and covered property damage, consider an electric motor manufacturer:
- Scenario A (Impaired Property — Excluded): An insured manufacturer supplies 500 electric motors to a commercial bakery equipment maker, which installs them into commercial dough mixers. Due to a manufacturing defect, the motors overheat and shut down after ten minutes of use. The mixers themselves suffer no physical burning or breakage, but the bakery equipment maker cannot sell them. By unscrewing four bolts, removing the insured's defective motors, and installing replacement motors, the mixers will function perfectly. The equipment maker sues the motor manufacturer for the lost rental revenue and storage costs incurred while the mixers sat idle. Because the mixers can be restored to full use simply by replacing the defective motors, the mixers are impaired property, and the loss of use is excluded under Exclusion m.
- Scenario B (Physical Injury to Tangible Property — Covered): The same defective motors overheat, catch fire, and burn down the bakery equipment maker's testing facility, completely melting 100 mixer chassis and destroying the testing laboratory. Because physical injury to tangible property occurred, and the mixers cannot be restored to use simply by replacing the motor, the property is not impaired property. Coverage A responds to defend and indemnify the damage to the testing facility and mixer chassis (excluding only the cost of the insured's own defective motor under Exclusion k).
3. Defining "Your Product" (Section V.21) & "Your Work" (Section V.22)
The definitions of "Your Product" and "Your Work" establish the scope of the insured's commercial output. They serve as the baseline for the business risk exclusions: Exclusion k (Damage to Your Product) and Exclusion l (Damage to Your Work).
Dissecting "Your Product" (Section V.21)
Under Section V, Definition 21, "your product" means:
- Any goods or products, other than real property, manufactured, sold, handled, distributed, or disposed of by:
- You;
- Others trading under your name; or
- A person or organization whose business or assets you have acquired.
- Inclusions:
- Containers (other than vehicles), materials, parts, or equipment furnished in connection with such goods or products (e.g., product packaging, aerosol cans, glass bottles, shipping boxes).
- Warranties or representations made at any time with respect to the fitness, quality, durability, performance, or use of "your product."
- The providing of or failure to provide warnings or instructions.
- Exclusion: "Your product" does not include vending machines or other property rented to or located for the use of others but not sold.
Dissecting "Your Work" (Section V.22)
Under Section V, Definition 22, "your work" means:
- Work or operations performed by you or on your behalf; and
- Materials, parts, or equipment furnished in connection with such work or operations.
- Inclusions:
- Warranties or representations made at any time with respect to the fitness, quality, durability, performance, or use of "your work."
- The providing of or failure to provide warnings or instructions.
The Critical Subcontractor Distinction
Notice the vital phrase in the definition of "your work": "work or operations performed by you or on your behalf." When a general contractor hires trade subcontractors (such as framing, plumbing, or electrical subs), the work performed by those subcontractors legally constitutes "your work" from the perspective of the general contractor.
This interaction is vital when applying the business risk exclusions:
| Feature | "Your Product" (Section V.21) | "Your Work" (Section V.22) |
|---|---|---|
| Nature of Exposure | Goods, chattels, manufactured merchandise, and physical inventory | Services, construction, installations, maintenance, and manual labor |
| Real Property Status | Explicitly excludes real property (buildings, land) | Includes construction and renovation of real property |
| Work Performed by Others | Only goods manufactured or traded under your name | Explicitly includes work performed on your behalf by subcontractors |
| Relevant Business Risk Exclusion | Exclusion k (Damage to Your Product) | Exclusion l (Damage to Your Work) |
| Subcontractor Exception Available? | No Subcontractor Exception: Damage to your product arising out of the product is always excluded. | Yes — Vital Exception: Exclusion l does not apply if the damaged work or the work out of which the damage arises was performed on your behalf by a subcontractor. |
A commercial grading contractor operates a tracked excavator at a road construction site. At the end of the workday, the contractor drives the excavator onto a flatbed trailer owned by the contractor and hitches the trailer to a heavy dump truck. While the truck and trailer are traveling at 45 mph on a public highway to the contractor's storage yard, a tie-down chain snaps, causing the excavator to slide off the trailer and crush an oncoming passenger vehicle. How will the contractor's standard ISO CGL policy respond to the resulting liability claim?
The CGL policy will provide full primary coverage because a tracked excavator is classified as mobile equipment.
The CGL policy will pay 50% of the claim under Supplementary Payments and require Commercial Auto to pay the remainder.
The CGL policy will exclude the claim under Exclusions g and h(1), because mobile equipment being transported by an insured's auto is an auto liability exposure.
The CGL policy will cover the claim under Products-Completed Operations because the workday had ended.
A valve manufacturer supplies a specialized flow-control shutoff valve to a commercial boiler manufacturer. After installation into 50 finished boilers, testing reveals that the shutoff valves stick in the closed position due to a manufacturing tolerance flaw. The boilers have suffered no physical damage, but they cannot be operated or sold with the defective valves. The boiler manufacturer simply unbolts the defective valves, screws in properly machined replacement valves, and the boilers function normally. The boiler manufacturer sues the valve supplier for $40,000 in lost production time and testing expenses. How does the valve supplier's ISO CGL policy respond?
The loss is covered under Coverage A as physical injury to tangible property.
The loss is covered under Products-Completed Operations because the boilers were located off the valve maker's premises.
The loss is covered under Coverage B as an infringement of trade dress.
The loss is excluded under Exclusion m because the boilers constitute 'impaired property' that can be restored to full use simply by replacing the defective valves.
Under the Section V definition of 'your work' in the ISO CG 00 01 form, which of the following is specifically included?
Work or operations performed on the named insured's behalf by subcontractors, along with warranties, representations, and instructions.
Only work physically performed by direct, W-2 employees of the named insured.
Goods and products manufactured, sold, handled, or distributed by the named insured.
Vending machines and other equipment rented to or placed for the use of customers but not sold.
Sections you finish are checked off in the contents.