Causes of Loss: Named Peril vs. Open Peril (All-Risk)

Why Causes of Loss Matter on the Nevada P&C Exam

Property insurance never covers "everything that can happen to a building." Instead, payment depends on how the policy defines covered causes of loss—the events that trigger coverage. On the Nevada Property & Casualty combo exam (141 scored items, passing scaled score of 70), causes-of-loss language appears across dwelling policies, homeowners Section I, commercial property, and inland marine topics. Mastering named peril versus open peril (often marketed as all-risk) is essential because it controls both scope of coverage and burden of proof after a loss.

Nevada producers explain this distinction daily: a Henderson homeowner assuming "full coverage" after a monsoon may learn that water damage from surface flooding is excluded; a Reno landlord on a basic dwelling form may discover that weight of ice on the roof was never a listed peril. Your role is to match peril structure to the client's exposure—not just sell the lowest premium.

Named Peril Coverage: Only Listed Events

A named peril policy covers direct physical loss caused by perils specifically listed in the policy or attached causes-of-loss form. If the peril is not named—and no endorsement adds it—there is no coverage, even when damage is sudden, accidental, and financially devastating.

Traditional named perils include fire, lightning, windstorm, hail, explosion, riot, civil commotion, aircraft, vehicles, smoke, vandalism, malicious mischief, theft, and volcanic eruption (exact lists vary by form). The ISO Basic Causes of Loss form (CP 10 10) and Broad form (CP 10 20) are commercial examples built on enumerated peril schedules. Dwelling DP-1 and the rarely sold homeowners HO-1 follow the same narrow logic.

Burden of proof: On a named peril policy, the insured must prove that (1) a covered peril occurred and (2) that peril directly caused the loss. If the insurer disputes causation, the insured carries the initial burden. Exam questions often describe ambiguous damage—water stains, cracked foundations, spoiled inventory—and expect you to recognize that the insured loses unless they tie the damage to a listed peril.

Named peril policies are narrower and typically less expensive. They may suit very limited exposures but leave major gaps for water damage, falling objects, weight of snow or ice, and accidental discharge of plumbing—perils commonly added only when the form broadens.

Open Peril (All-Risk) Coverage: Everything Except Exclusions

An open peril policy covers direct physical loss from any cause except those specifically excluded or limited in the policy. The analytical question shifts from "Is this peril on the list?" to "Is this cause excluded?"

The ISO Special Causes of Loss form (CP 10 30) is the commercial open-peril standard. Homeowners HO-3 applies open-peril protection to Coverage A (dwelling) and Coverage B (other structures). HO-5 extends open-peril treatment to personal property as well. Dwelling DP-3 uses a special/open approach for the structure.

Burden of proof: Under open-peril coverage, the insurer must prove that an exclusion or limitation applies to deny payment. This reversal is heavily tested and practically important when adjusters evaluate chain-of-events losses—power surge after lightning, water following fire suppression, or spoilage after equipment breakdown.

Open peril does not mean unlimited coverage. Standard exclusions still apply: flood, earth movement, ordinance or law (unless endorsed), intentional loss, war, nuclear hazard, wear and tear, deterioration, rust, corrosion, gradual seepage, insects, vermin, and many mold scenarios. Nevada clients in Clark County still need NFIP or private flood coverage; labeling a policy "all-risk" does not cover flash-flood damage from desert downpours.

Comparison Table: Named vs. Open Peril

ISO Commercial Ladder: Basic, Broad, and Special

Commercial property exams love the Basic → Broad → Special progression:

• Basic (CP 10 10): Short named-peril list—typically fire, lightning, explosion, windstorm, hail, smoke, aircraft, riot, vandalism, sprinkler leakage, and limited additional perils depending on edition.
• Broad (CP 10 20): All Basic perils plus additional named perils such as breaking of glass, falling objects, weight of snow, ice, or sleet, and water damage from accidental discharge of sprinklers or appliances.
• Special (CP 10 30): Open perils subject to exclusions stated in the form—not a longer named list.

Exam trap: questions ask which peril is added when moving Basic to Broad, not which perils are excluded under Special.

Nevada Exam Scenarios

Reno rental (DP-1): A cigarette ignites living-room carpet. Fire is a named peril; dwelling coverage responds. Water damage from fire hoses may not be covered unless the form or endorsement broadens water-related perils—a classic named-peril gap.

Summerlin HO-3: A severe windstorm uproots a tree onto the roof. Open-peril Coverage A applies unless the insurer invokes a valid exclusion; the insured does not need to find "windstorm" on a peril list. Personal property inside damaged rooms may still require named-peril proof under Coverage C on HO-3.

Ely retail store (CP 10 30): Refrigerated inventory spoils after a lightning-caused power surge. The insurer must identify an applicable exclusion (e.g., utility interruption, mechanical breakdown) to deny the claim—open peril shifts the argument.

Common Exam Traps

1. "All-risk" is marketing language—exclusions always exist.
2. HO-3 is hybrid: dwelling open peril, personal property named peril.
3. Mysterious disappearance ≠ theft—coverage differs sharply.
4. Earthquake and flood require separate coverage or endorsements throughout Nevada.
5. Concurrent causation questions may combine covered and excluded events—know that anti-concurrent-causation language may apply in some policies.

Understanding named versus open peril is the gateway to every property form you will sell in Nevada. Clients who grasp burden of proof make better claims decisions; producers who do earn fewer E&O surprises after the next wildfire season.