HARBOR SYSTEM MASTER PLAN - City and Borough of Sitka

The panel board is a 200 ampere, single
phase rated load center with plug-in
type circuit breakers. This panel serves
and protects circuits for numerous
receptacles and lighting. The load
center is installed inside a non-metallic,
NEMA 4 rated enclosure and mounted
on a free standing frame fastened to
the deck.
The system neutral is bonded to
ground at the service equipment on
shore. The grounding system is
configured with a conductor in the
bundle to the panel board on the Work
Float. The system includes a second
electrode on the Work Float immersed
into the water through the float near
the pole supporting the panel board.
The second electrode is copper clad
steel.
Receptacles for equipment power,
vessel shore power, and convenience
power are located on the panel board
support structure and on a pole near
the structural pilings on the East end of
the float. The convenience receptacles
are 120 volt, single phase with ground
fault protection integrated into the
receptacle. The equipment receptacles are rated 50
amperes with a maximum impressed voltage of
125/250 volts. And the vessel shore-tie receptacles
are NEMA L6-30 type.
Each equipment receptacle (4 each) is protected
with a 50 ampere, two pole circuit breaker. The
shore-tie receptacles (2 each) are protected with 30
ampere, single pole circuit breakers, and the lighting
and convenience receptacles are protected with 20
ampere, single pole circuit breakers.
The panel board and receptacles are supported with
the pole also supporting the luminaire on both ends.
The poles and supporting structures are hot-dipped
galvanized steel.
Lighting:
The luminaires on the Approach Dock and on the
Work Float are cobra head type typically used for
street lighting. They appear to utilize 100 watt high
pressure lamps and incorporate an illumination cutoff
characteristic. All of the luminaires include
integrated photoelectric cells.
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Sitka Harbor System Master Plan
Condition Inventory