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3.12 Electrical Connections, Grounding and Bonding
All a/c units have a terminal strip mounted inside the electric box. The terminal strip is labeled
for proper connections of the electrical supply, ground wires and pump circuits. A wiring diagram
is provided in the electrical box and later in this manual. The wiring diagram in the electrical box
supersedes any found in this manual and ABYC standards. The correct size circuit breaker should
be used to protect the system as specified on the a/c unit's data plate label. A minimum of 12 AWG
boat cable should be used to supply power to the a/c unit and the seawater pump. All connections
shall be made with ring or fork terminals. Turn off a/c power supply circuit breaker before
opening electric box.
Each a/c installed requires its own dedicated circuit breaker. If there is only one a/c installed,
the seawater pump does not require a circuit breaker; the wiring from the seawater pump is
connected to the terminal strip in the electric box. If two or more a/c use the same seawater pump,
the pump wires will be connected to a pump relay, Please refer to the wiring diagram. Electrical
connections in the bilge and/or below the waterline should use heat shrink type butt splices. Field
wiring must comply with ABYC electrical codes. Power to the unit must be within the operating
voltage range indicated on the data plate. Properly sized fuses or HACR circuit breakers must be
installed for circuit protection. See data plate for maximum fuse/circuit breaker size (MFS) and
minimum circuit amperage (MCA). All units must be effectively grounded to minimize the hazard
of electrical shock and personal injury. The following can be observed: AC (alternating current)
grounding (green wire) must be provided with the AC power conductors and connected to the
ground terminal (marked "GRND") at the AC power input terminal block of the unit(s), per ABYC
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