Marina Power Pedestal Product

Overview

A shore power pedestal is the electrical distribution point at a marina slip, providing 30–50 A of 120/240 V or 208 V power to moored vessels. The Pedestal Pole is a stainless steel or aluminum post rising 1.5–2.5 m above the dock, housing receptacles, metering, and protection circuitry in a weatherproof [[shore-power-pedestal-housing|enclosure]]. Each pedestal serves a single slip and includes a Main Breaker Assembly for isolation, Sub-Metering Unit for billing, and [[shore-power-fault-protection|GFCI protection]] against electrocution.

Modern marinas deploy one pedestal per 30–50 feet of dock length. A typical 100-slip marina has 2–3 pedestals per dock section, totaling 6–9 units. The Conduit & Cable is run underground from a centralized service panel to avoid trip hazards and weather exposure. The Navigation Light dusk-to-dawn LED beacon aids vessel approach during low visibility.

How it works

The marina electrical service (typically 400 A 120/208 V or 277/480 V 3-phase) is distributed to a shore power control panel. From there, individual circuit breakers feed the Conduit & Cable underground to pedestals. Within each pedestal, the Main Breaker Assembly provides a lockable disconnect, allowing the shore power attendant to deactivate a slip during unoccupied periods or for maintenance.

The Sub-Metering Unit solid-state watt-hour meter integrates real-time power consumption and uploads cumulative kWh to the marina billing system via [[shore-power-meter-comms|wireless or Modbus communication]]. Vessel owners are billed monthly based on meter readings.

The Receptacle Outlets (typically NEMA 6-50R, a 50 A marine connector) are protected by the [[shore-power-fault-protection|GFCI module]], which detects stray currents (e.g., hull leakage or floating ground faults) and trips the outlet within 25 ms, preventing electrocution.

Safety design

GFCI protection is mandatory in marine environments per National Electrical Code (NEC) Article 555. Any conductive pathway to water (hull, seawater, wet deck) creates electrical shock risk. The GFCI detects differential current between hot and neutral; stray current >30 mA signals a fault and breaks the circuit.

The Pedestal Pole is bonded (electrically connected) to the dock structure and a grounding rod driven 5–8 feet into soil or seabed, establishing a low-impedance return path for fault currents. The [[shore-power-housing-drain|drain valve]] at the bottom of the Pedestal Enclosure prevents water accumulation during rain or high-humidity salt-spray conditions.

Power distribution example

A 50-slip marina operating at full capacity (average 5 kW per slip) draws 250 kW from the utility. Peak demand (all slips running AC and heating simultaneously) reaches 400 kW, requiring a 500 A service entrance and backup generator. The Sub-Metering Unit sub-meters track individual slip consumption, revealing usage patterns and enabling dynamic pricing (higher rates during peak hours).

Outdoor durability

The Pedestal Pole is fabricated from aluminum 6061-T6 or stainless 304/316 steel, resisting saltwater corrosion. Stainless is preferred in coastal marinas where galvanic corrosion is a concern. The Pedestal Enclosure enclosure is either stainless or epoxy powder-coated steel with at least 8 mil coating thickness. All fasteners are stainless A2-70 bolts; galvanized bolts oxidize in salt spray.

The [[shore-power-receptacle-surround|outlets are capped]] when not in use, protecting contacts from salt crystallization and corrosion. Vessel owners are responsible for plugging unused receptacles on their pedestal with dummy caps.

Installation standards

Shore power pedestals must comply with NFPA 70 (National Electrical Code) Article 555 and ABYC (American Boat and Yacht Council) standards. Service entrances are bonded together via a common bonding grid (copper bar or cable) at the marina control building, equalizing potential across all pedestals and preventing shock between adjacent slips.

Ground rods are driven to at least 8 feet depth; in marinas with poor soil conductivity, multiple rods in parallel may be required. The Conduit & Cable is buried 24 inches (0.6 m) below grade in conduit, protecting cables from anchor damage and freezing cycles. PVC Schedule 40 conduit is standard; Schedule 80 is used in high-traffic dock areas.

Maintenance

The Meter Display should be read monthly for trend analysis. Unusually high consumption may indicate a plugged heater or refrigeration unit aboard. The GFCI Module should be tested quarterly by pressing the TEST button; the outlet should de-energize. If the TEST button fails to trip, the GFCI is defective and requires replacement.

The Pedestal Enclosure door gasket should be inspected annually for cracking or hardening. The LED Ballast LED ballast may require replacement after 5–10 years of continuous outdoor operation. Corrosion on stainless fasteners or housing should be cleaned with freshwater and mild detergent; this prevents galvanic coupling between different metal types.

Future upgrades

Emerging marinas are upgrading to DC shore power (±400 V) to charge battery-electric vessels directly, bypassing onboard converters. The Sub-Metering Unit infrastructure enables time-of-use pricing, encouraging vessels to charge during off-peak hours (night) when grid power is cheapest. Smart pedestals with microcontroller-based charge control will become standard as electrification expands.