Exposed wire = shock + fire risk.
Exposed copper or damaged insulation on electrical wiring creates shock risk for anyone touching it and fire risk if the bare conductor contacts grounded metal or moisture.
By Steven Lockhart · Reviewed by Alex Towery, C-10 #989290
Updated 2026-06-16
Exposed wiring: don't touch, isolate (turn off the circuit at panel if you can identify it; otherwise main breaker), call electrician same-day for repair. Common scenarios: pet/rodent damage to cable insulation, mechanical damage from construction/remodeling, weather damage to outdoor wiring, age-related insulation breakdown. Repair varies from simple splice/cover ($150-$300) to wire replacement section ($300-$800) or significant rewiring scope.
01Common causes and locations.
Pet and rodent damage: cats and dogs occasionally chew on accessible cables (cord damage is also a chewing risk). Rodents (rats, mice, squirrels) chew on wire insulation in walls, attics, basements, garages. Rodent damage often discovered in attics during seasonal inspections or after pest activity is noticed. Mechanical damage during construction/remodeling: contractor cuts through wires accidentally during demo, drywall work, or framing. Often noticed when circuit fails or visible damage is spotted.
Weather damage to outdoor wiring: UV exposure degrades cable jackets over years; physical damage from falling branches, lawn equipment, or wildlife. Outdoor receptacles and conduit transitions are vulnerable points. Age-related insulation breakdown: knob-and-tube wiring (in some pre-1950 Marin homes) and early cloth-insulated cables can develop brittle insulation that cracks and flakes off, exposing copper conductors. This is condition-based, often discovered during inspections or unrelated work.
02Response.
Don't touch
Even if you think the circuit is off, don't touch exposed wiring. Voltage can be present from sources you don't expect; conductors can be energized from cross-connections, induced voltage from nearby wiring, or backfeed.
Isolate
If you can identify which circuit serves the area: turn off that breaker at the panel. If not: turn off main breaker to fully de-energize. If exposed wiring is outdoors and you can't approach safely: call PG&E for service disconnect at the meter.
Cover area access
If exposed wiring is in an accessible location where people or pets might contact it: barrier the area (close door, place obstacle) until electrician arrives. Same-day repair appropriate; emergency only if fire risk is acute (wires touching combustible material, sparking).
03Repair approach.
Small damage in accessible location (single cable, short length of damaged insulation): repair often involves cutting out damaged section, splicing in new wire, junction box installation if needed (splices must be in accessible boxes per code, not buried in walls). Cost $150-$350 typical. Larger damage (longer wire section, multiple cables affected): replace damaged section with new wire run. Cost $300-$800 depending on length and access difficulty.
Whole-circuit or whole-home implications: if pattern shows widespread issue (extensive rodent damage, knob-and-tube replacement, age-related wire deterioration throughout home): larger scope work. Knob-and-tube replacement runs $5,000-$15,000+ depending on home size. Rodent damage cleanup often requires pest control collaboration to prevent recurrence. Major rewiring scope work is rare but does occur in older Marin homes — we assess and quote during diagnostic.
Common questions.
What if my pet chewed a cord — is the cord ruined?
For appliance/lamp cords (not in-wall wiring): replace the cord. Don't splice and tape damaged cords for ongoing use — the splice point becomes a heat/fire risk during operation. Most cords are easily replaceable. For in-wall wiring damage by pets (pets accessing wiring at outlets, holes, etc.): electrician repair, plus consider why pet accessed the location and prevent recurrence.
How urgent is exposed wiring really?
Same-day urgency for most scenarios. Active shock or fire risk (exposed wire in reachable location, sparks, smoke): emergency. Exposed wire in low-access area (attic, behind appliances) without active fault: same-day diagnostic. The risk doesn't usually escalate within hours, but it doesn't get better either — and forgetting to address it after first noticing creates ongoing risk.
Will my homeowner insurance cover this?
Depends on cause. Sudden damage events (rodent infestation discovered, mechanical damage from incident) often covered. Gradual deterioration (aging knob-and-tube) often considered maintenance, not covered. Document with electrician report; submit claim and let insurance determine coverage. Often partial coverage applies even when full coverage doesn't.
How do I prevent this in the future?
Pest control to prevent rodent damage (sealing entry points, ongoing monitoring); cord management to prevent pet/tripping damage; awareness during DIY projects (where are wires before cutting/drilling?); outdoor wiring inspection during routine home maintenance (annual visual check of accessible outdoor electrical components). Older homes with knob-and-tube: scheduled replacement as part of broader electrical upgrade is the proactive approach.
How do you handle pricing — flat fee or hourly?
Both, depending on scope. Routine service calls and predictable scope (panel replacement, EV charger install, transfer switch install, fixture replacement) are flat-fee quoted up front. Diagnostic visits and emergency scope are hourly because we don't know what we'll find. Either way, you get a written quote before work starts on anything significant, and we don't proceed beyond the quote without your sign-off.
How quickly can you schedule?
Depends on scope and season. Emergency dispatch: same-day across Marin County (1-3 hours business hours, 1-4 hours after-hours). Same-day standard service: 3-6 hours from call when capacity allows; otherwise next business day. Scheduled service work: 1-3 weeks typical. Larger projects requiring permits and PG&E coordination: 4-12 weeks depending on scope. We're upfront about timeline at the quote stage.
What warranty do you offer on work?
Our standard residential warranty: 2 years on labor, manufacturer warranty on parts (varies by product — typically 1-10 years). Major installs (panels, generators, EV chargers) often have longer manufacturer warranties (5-10 years). If there's an issue with our work in the warranty period, we come back and fix it at no cost. We also stand behind work past warranty — repeat customers and referrals matter more than a transactional fix.
Are you licensed and insured?
Yes. California State License Board C-10 Electrical Contractor #989290, in good standing. Carry general liability insurance and workers' compensation insurance as required by California law. Bondable on projects requiring it. Happy to provide proof of insurance to clients or property managers on request. License lookup: cslb.ca.gov.
Same-day diagnostic visit in Marin.
We bring the right test gear and most common parts. Single-visit repair on roughly 80% of diagnostics.