12/20/11 888-2595-001 2-7
WARNING: Disconnect primary power prior to servicing.
Section 2 Installation
ZX Series
THE COMMON VOLTAGE REFERENCE TO ALL THREE PHASES. SHOULD THE
NEUTRAL CONNECTION BREAK, THE LINE-TO-LINE VOLTAGE OF EACH PHASE
WILL BECOME UNSTABLE AND INVARIABLY RESULT IN SEVERE DAMAGE TO ALL
LOADS FROM AN OVERVOLTAGE CONDITION. ACCORDINGLY, ALL NEUTRAL
CONNECTIONS SHOULD BE DOUBLE CHECKED FOR INTEGRITY, ESPECIALLY
WHEN MODULAR MAINS DISCONNECT PLUGS ARE IN USE. NEVER ALLOW THE
NEUTRAL TO BE BROKEN BEFORE THE INDIVIDUAL LINE CONNECTIONS. THIS
RECOMMENDATION HOLDS FOR ALL SINGLE-PHASE EQUIPMENT WITH A WYE-
DERIVED FEED, NOT JUST HARRIS ZX TRANSMITTERS.
If using metal conduit, install the AC mains wiring in a separate conduit from all exciter
input cables and small signal lines.
2.7 Surge Suppression Devices
Harris strongly recommends the use of surge protection devices on the incoming AC
mains lines. These devices protect against damages due to transients arising from both
natural and man-made sources. (e.g. lightning and inductive load switching). Clear
preference is to be given to “series” type surge protection devices -- featuring protection
by both a series inductance (choke) and a shunt threshold clamping device -- over
simple shunt-only devices. The surge protector must be connected to the building
ground system by short, direct connections. In the case where the shunt protection
elements are protected by a fuse, it is necessary to periodically check the integrity of the
fuse to ensure continued transient protection.
FAILURE TO FOLLOW THESE RECOMMENDATIONS MAY LEAD TO SHORTENED
EQUIPMENT LIFE AND REDUCED RELIABILITY.
2.8 Ground Requirements
Two separate ground connections are required for the ZX series transmitter: an AC
safety ground and an RF earth ground.
The AC safety ground prevents an electrocution hazard should a dangerous potential
from inside the unit accidentally contact an exposed metal surface. This is done by
ensuring all metal surfaces have an uninterrupted connection back to the physical earth
terminal (PE) at the AC mains service entrance. A physical earth connection is
typically tied to the return current terminal either indoors at the main distribution panel
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