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AC Power and Grounding Requirements
Addendum
AC Power Requirements
The KVH antenna system is designed to run on 3-wire single-phase
AC power (hot, neutral, and ground). Voltage between hot-neutral
and hot-ground should each measure between 100-240 VAC.
Many large ships use two-phase, split-phase, or delta power instead
(3 wires: hot, hot, and ground; no neutral). In this case, voltage
between hot-hot measures the proper voltage (100-240 VAC); while
hot-ground measures only half the voltage (50-120 VAC). Although
KVH antenna systems can operate on this type of power, the excess
voltage present on the second phase will cause a small amount of
current to leak onto ship's ground. This leakage current might be
unacceptable on some vessels. So be sure to check with the customer
or ship's electrician and get permission before you run the antenna
system on two-phase power. Also be sure to ground the system, as
explained on the next page.
If two-phase power is the only available power source onboard, and if
leakage current is unacceptable, KVH recommends that you install a
suitable isolation transformer to supply single-phase power to the
antenna system and run a ground wire from the transformer to ship's
ground. In addition, since ground fault protection devices cannot
detect faults behind a transformer, you will also need to install a
ground fault monitoring device between the isolation transformer and
the antenna system if ground fault protection is required on the vessel.
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