188 • Section 8 — Electrical Systems - House Cayman 2006
WARNING:
Avoid the risk of electrical shock or component damage by disconnecting from shore power
during electrical storm activity. Use the Inverter/Charger or start the generator, if AC power
is needed.
Power Supply:
Different amperage supplies vary greatly in the amount of available current.
• The continuous amount of current through a breaker or fuse is only 80% of its rated capacity.
• 50 Amp 240 Volt AC shore power service consists of two power supply conductors (120 Volts AC each), a
neutral and a safety ground. The 50 Amp breaker simultaneously limits each power supply conductor to no
more than a short-term maximum of 50 Amps for each conductor. The 50 Amp 240 Volt service actually
provides 80 continuous amps.
• Use care when hooked to anything less than 50 Amp shore service. Shore power service less than 50 Amps
consists of one power supply conductor, a neutral and a safety ground; 30 Amp shore service is limited to
24 continuous Amps; 20 Amp shore service is limited to 16 continuous Amps.
Electrical Adapters:
There are many different electrical adapters to suit a variety of needs. Only UL approved adapters should be
used. The most common adapter is a 50-30 Amp adapter. The type of connector adapts the 50 Amp shore cord to a
30 Amp shore power outlet. Another common adapter is the 30-20 Amp adapter. Always install the adapter to the
cord prior to making the connection to the outlet.
060164
Typical 50-30 Amp Adapter
060174
Typical 30-20 Amp Adapter: Adapts 30 Amp Shore Cord to 20 Amp Shore Power Outlet
060121c
Three types of shore power outlets most commonly used.
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