Class Code 5191: Electrical Wiring — Residential — CA Workers Comp Guide

What Class Code 5191 Covers

Class code 5191 applies to electrical contractors holding a California C-10 (Electrical) license who perform wiring and electrical installation in residential structures. Covered work includes rough electrical wiring in new residential construction (running wires through framing before drywall), finish electrical work (installing outlets, switches, panels, and fixtures), service upgrades and panel replacements in existing homes, electrical work for home additions and remodels, installation of EV charger circuits, solar panel electrical connections (DC side at the roof is often solar-specific, but AC side connection to main panel falls here), and low-voltage pre-wiring for data, audio, and security systems when performed by the same electrical contractor.

The key classification criterion is the type of structure: residential. Single-family homes, duplexes, townhomes, condominiums, apartment buildings of all sizes, and other structures classified as residential under the applicable building code are the defining characteristic. The type of electrical work being performed — whether rough wiring, finish work, or service upgrade — does not change the residential classification.

Residential electrical work in multi-family structures (apartment buildings, condo complexes) is still code 5191 because the structure is residential, even though the project scope may be large. An electrical contractor wiring a 200-unit apartment building uses 5191, not the commercial code 5190.

5191 vs. 5190: The Critical Rate Distinction

Code 5190 (Electrical Wiring — Inside) covers commercial and industrial electrical work — office buildings, retail, warehouses, hospitals, schools, industrial facilities. The 5190 rate is higher than 5191, reflecting the greater complexity and hazard of commercial electrical work (higher voltages, three-phase systems, working in occupied commercial buildings with live systems).

The distinction is entirely structural: the type of building determines the code, not the complexity of the electrical work. A residential-only electrical contractor uses only 5191. A contractor who wires both homes and commercial buildings splits payroll between 5191 and 5190 based on actual hours or payroll allocated to each type of project. Carriers and WCIRB auditors scrutinize this split because misclassifying commercial work as residential underreports premium.

Signs that a contractor may be improperly using 5191 for commercial work: performing work in office buildings or retail spaces, pulling commercial building permits, working on projects described as commercial by the general contractor. These indicators trigger detailed payroll and project reviews at audit.

Who This Code Applies To

Licensed electricians (C-10 license holders) performing residential wiring are the core 5191 population. California electricians are often trained through IBEW apprenticeship programs (4-5 year apprenticeship), producing journeyman wiremen who work for electrical contractors. Non-union residential electrical contractors may employ apprentices training through other programs or direct on-the-job training arrangements.

Electrical helpers and apprentices working under journeyman supervision are also coded 5191. Electrical estimators who work in the office and do not perform field work are coded 8810. Field supervisors and forepersons who oversee residential wiring crews and perform hands-on work with them are coded 5191.

Working owners of residential electrical contracting companies who regularly perform hands-on electrical work are typically coded 5191 unless they hold a qualifying exclusion. Corporate officer exclusions are available for 100%-owning shareholders — a meaningful option given that owner wages in electrical contracting can be substantial.

WCIRB Advisory Rate and Premium Calculation

At $5.82 per $100, residential electrical carries significant premium relative to lower-hazard trades. For a residential electrical contractor with 10 journeyman electricians averaging $85,000 annually (approximately IBEW journeyman scale in Southern California):

• Total electrician payroll: $850,000
• Manual premium: ($850,000 ÷ 100) × $5.82 = $49,470
• With 1.00 ex-mod and 1.05 LCM: approximately $51,944
• Plus CA surcharges: approximately $53,762 total

IBEW contractors with journeyman wages above California’s payroll cap ($99,000 per employee per year for WCIRB purposes in 2025) can cap individual employee payroll at the statutory maximum, reducing calculated premium. This cap benefits contractors with high-wage electricians on large residential projects.

Electrical Safety: Key Hazards and Cal/OSHA Requirements

Electrocution and electrical contact injuries are the defining catastrophic hazard of electrical contracting. Cal/OSHA’s electrical safety standards (Title 8 CCR 2299-2974) require: work on live circuits only when de-energizing is infeasible; lockout/tagout procedures for all work on or near energized equipment; insulated tools and PPE rated for the voltage level; arc flash PPE for work near energized equipment above 50 volts; and documented electrical safety training for all employees.

Falls from ladders are the second major catastrophic hazard. Electricians work extensively from ladders — routing wire through walls and ceilings, installing panels and light fixtures, connecting service entrances at eave level. Portable ladder safety requirements (angle, footing, height limitations, tie-off when required) apply throughout residential electrical work.

Arc flash incidents — explosive releases of energy when electrical faults occur near energized conductors — are a major injury pathway for electricians working near live panels. Arc flash can cause severe burns, eye damage, and blast injuries. PPE requirements and minimum approach distances are established by NFPA 70E standards.

Typical Injury Types in Code 5191

Electrocution and electrical burns from contact with live conductors represent the most severe injury potential. Direct contact with energized wiring, arc flash incidents near panels, and contact with improperly grounded equipment are the primary pathways.

Falls from ladders account for a significant proportion of serious injuries. An electrician falling from a 10-foot ladder while routing wire can sustain fractures, head injuries, and spinal injuries with significant medical and indemnity costs.

Lacerations from wire handling — cuts from sharp wire ends, scrapes from pulling wire through conduit or framing, and punctures from nails and screws encountered during rough-in work — generate consistent minor claim volume.

Musculoskeletal injuries from overhead work (reaching above shoulder height to install fixtures and wire through framing), sustained awkward postures in attics and crawlspaces, and manual handling of heavy panel equipment and conduit contribute to cumulative claim costs.

Underwriting Considerations

Residential electrical contractors are well-understood by California workers comp underwriters. Key factors: IBEW vs. non-union (union contractors typically have better safety training and loss experience); size and revenue; mix of new construction vs. service/repair work (service work involving live circuits in occupied homes has different risk characteristics than new construction rough-in); loss run review; and whether the contractor also performs commercial work requiring 5190 allocation.

Contractors with EV charger installation as a growing revenue line may see underwriters probe whether they are entering commercial EV charging installations (commercial parking structures, fleet charging) which would trigger 5190 exposure. The residential vs. commercial distinction is as relevant for EV charging as for any other electrical work.

Carriers Active in Code 5191

ICW Group is one of the most active carriers for residential electrical contractors in California. The Hartford and Travelers write residential electrical across all sizes. Liberty Mutual and Zurich are active for larger electrical contractors. EMPLOYERS and AmTrust write smaller residential electrical operations. IBEW contractors may have access to union-sponsored workers comp programs through their local union agreements, which can offer competitive rates for contractors with strong union safety training compliance. State Fund is available for contractors who cannot secure admitted market coverage.