Okay, this is a tricky situation and needs to be approached carefully to ensure safety and code compliance. Here's a breakdown of the relevant considerations and why a winch/pulley system is unlikely to be compliant, along with potential alternatives

Why a Winch/Pulley System is Problematic (Likely Violates Code):
Permanence and Secure Attachment

The NEC (National Electrical Code) emphasizes the permanency and security of electrical installations. A winch and pulley system inherently introduces instability and the potential for movement. While you might be able to design a robust system, proving it meets the intent of the code regarding secureness is difficult.

Strain on Conductors and Connections

Repeated raising and lowering would subject the conductors to flexing and strain, potentially leading to insulation damage, conductor breakage, and loose connections over time. This is a significant safety concern. Ordinary overhead conductors aren't designed for constant movement.

Clearances

The NEC has specific requirements for the height of overhead conductors above ground, water, and structures. A variable-height attachment point makes it very difficult to consistently maintain these clearances, especially as water levels fluctuate.

Weather Exposure

The winch, pulleys, and any connections would be constantly exposed to the elements, increasing the risk of corrosion and failure.

Unauthorized Adjustment

The ability to easily adjust the height of the wires could be a safety hazard. Someone untrained could adjust it incorrectly, creating a dangerous situation.

Relevant NEC Articles to Consider (Not an exhaustive list, consult a qualified electrician)



Article 225 (Outside Branch Circuits and Feeders)

This article covers overhead spans and requirements for clearances, supports, and conductor types.

Article 396 (Service Cables)

If the overhead line is a service cable (carrying power directly from the utility), Article 230 (Services) would also be applicable.

Article 310 (Conductors for General Wiring)

This article covers conductor types, ampacity, and installation methods.

Article 314 (Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures)

This article covers the secure and weatherproof installation of boxes and enclosures.

Article 390 (Cable Trays)

If the wires are in a tray or raceway, then these requirements must be met as well.

Article 392 (Cablebus)

Cablebus is an assembly of insulated conductors with fittings and terminations in a completely enclosed, ventilated protective metal housing.

Article 400 (Flexible Cords and Cables)

Only flexible cable types should be used, and only when permitted by the NEC.

110.3(B) Installation and Use

Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling.

Alternatives (with Cautions - Consultation with a Qualified Electrician is Crucial)


Extend the Pole Height

The most straightforward (and likely most code-compliant) solution is to increase the height of the support pole sufficiently to keep the overhead conductors above the highest expected water level. This may involve replacing the pole entirely or adding an extension. Considerations: Requires careful engineering to ensure the pole can withstand wind loads and the weight of the conductors. May require new permits.2.

Underground Wiring

Burying the wiring is a reliable solution, but it's more expensive and disruptive. You would need to trench from the shore power supply to the dock and use appropriately rated underground cable in conduit. Considerations: Requires trenching, proper burial depth, and protection from physical damage.3.

Floating Conduit

A rigid or flexible conduit that allows the cable to travel along with the changes in water level. Considerations: Requires secure mounting so that the conduit doesn't disconnect.

Crucial Steps



Consult a Qualified Licensed Electrician

This is the most important step. A licensed electrician familiar with the NEC and local codes can assess the specific situation, determine the safest and most compliant solution, and obtain any necessary permits.

Local Authority Having Jurisdiction (AHJ)

Talk to your local building inspector or electrical inspector. They have the final say on whether a proposed solution is acceptable.*

Documentation

Keep detailed records of any changes made to the electrical system, including permits, inspections, and documentation of the work performed.

In summary, while your customer's desire for an adjustable system is understandable, it's highly unlikely to be code-compliant due to safety and stability concerns. Focus on solutions that provide a permanent, secure, and code-compliant electrical connection. Flag for review