u/Read_it_all-7735

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I am experiencing a consistent, time-specific undervoltage condition on one of two 30 A, 120 V shore-power circuits supplying my vessel in a marina slip. Each circuit uses a separate 30 A cable and feeds an independent electrical system aboard the boat.

Symptoms The affected pedestal receptacle exhibits the following behavior, repeatable on multiple mornings between approximately 09:00 and 11:00 AM:

• Voltage drops to 10–20 V
• Intermittently spikes to ~50 V
• Drops again, then slowly recovers to nominal 120 V

The companion receptacle on the same pedestal remains stable at 120 V throughout. Direct voltage measurements confirm the issue is isolated to the marina-supplied receptacle, not the boat-side wiring or appliances.

System Description The pedestal is fed from a marina distribution panel containing individual revenue meters for each slip. The meters are supplied by a nearby step-down (I assume its step down) transformer. The transformer primary is served from the utility through a main disconnect enclosure equipped with three 100 A fuses.

The marina has a high live-aboard population, resulting in sustained heavy loading on an aging dockside electrical plant.

Questions

1. For work on the dockside infrastructure—specifically the 100 A main fuses, transformer, metering section, feeders, and pedestal receptacles down to the point of attachment—does this require an electrician who is specially qualified or certified for marina and boatyard installations (NEC Article 555)? I fully understand that any work on the vessel side must use ABYC-compliant marine-grade components and methods.
2. Could a failing or intermittent 100 A upstream fuse/breaker (ahead of the transformer and meters) produce a low or fluctuating voltage condition isolated to a single downstream receptacle? If not, what are the most likely causes for an isolated voltage drop/fluctuation of this nature? (Examples: loose or failed termination, high-resistance or damaged conductor, neutral issues, meter socket or pedestal connection problems, etc.)

I am standing by for questions as needed.