Marina Electrical Services

Powering Safer Marinas. Protecting People. Keeping You Compliant.

Marinas are among the most demanding electrical environments. Constant exposure to water, corrosion, weather, high-current shore power, and the interaction of AC and DC electrical systems create unique challenges that require specialized expertise. At O'Neill Electric Inc., we help marina owners, municipalities, yacht clubs, boatyards, and docking facilities design, install, maintain, and modernize electrical systems that are safe, reliable, and fully code compliant. Whether you're installing a new dock system, upgrading aging shore power, troubleshooting complex electrical issues, or planning a complete marina renovation, our experienced team understands the unique requirements of waterfront electrical systems and the latest NEC Article 555, NFPA 70, NFPA 70B, NFPA 70E, and NFPA 303 standards - delivering solutions that protect people, preserve your investment, and keep your marina operating safely.

Proudly serving Minnesota, Wisconsin, and the Upper Midwest.

Complete Marina Electrical Solutions

Installation Services

From new marina construction to dock expansions and equipment replacements, we provide complete installation services designed to meet today's electrical codes and tomorrow's boating demands.

Our installation services include:

  • Complete electrical service installations for new dock systems

  • Shore power service installations

  • Dock circuit installations

  • Dock pedestal installations and replacements

  • Dock pedestal upgrades and repairs

  • Marina distribution equipment installation

  • Feeder and branch circuit installations

  • Ground-fault protection equipment (GFPE) installation and replacement

  • Utility coordination

  • Permit assistance

  • Inspection coordination

Every installation is completed with safety, reliability, and long-term performance in mind.

Marina Electrical Design Services

A successful marina project starts with proper planning.

Our electrical design services help marina owners, engineers, contractors, and developers create systems that are efficient, expandable, and fully compliant with the latest National Electrical Code requirements.

Our design capabilities include:

  • New marina electrical system design

  • Dock electrical layouts

  • Electrical construction drawings

  • Project specifications

  • Electrical load calculations

  • Service sizing

  • Feeder sizing

  • Branch circuit sizing

  • Voltage drop calculations

  • Conductor sizing

  • Raceway sizing

  • Grounding and bonding design

  • NEC Article 555 compliance reviews

Whether you're building from the ground up or renovating an existing marina, we'll help ensure your electrical infrastructure is designed correctly before construction begins.

Maintenance & Troubleshooting

Electrical problems on the waterfront require more than trial-and-error troubleshooting.

Our technicians specialize in identifying difficult electrical faults while minimizing downtime and improving safety for your marina and customers.

Our troubleshooting services include:

  • Leakage current testing

  • Shore power troubleshooting

  • Ground-fault protection troubleshooting

  • GFCI troubleshooting

  • Nuisance breaker trip investigations

  • Dock pedestal testing and repair

  • Shore power receptacle testing

  • High-impedance AC voltage-in-water testing

  • DC stray-current troubleshooting

  • Corrosion-related electrical investigations

  • Electric Shock Drowning (ESD) hazard investigations

  • High-impedance AC fault troubleshooting

  • Grounding and bonding inspections

  • Infrared electrical inspections

  • Preventive electrical maintenance

Our goal is simple:

Find the problem quickly. Fix it correctly. Keep your marina operating safely.