GHX-308A/616
HYBRID KEY TELEPHONE SYSTEM
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3.5 KSU GROUNDING
To ensure proper system operation and for safety purposes, a good ground is required. A metallic COLD water pipe
usually provides a reliable ground. Carefully check that the pipe does not contain insulated joints that could isolate the
ground path. If insulated joints exist, another earth ground source must be used or, if allowed, the joints may be bridged.
A #14 AWG or larger copper wire should be used between the ground source and the KSU. The
wire should be kept as short as possible, it is recommended that the wire be no longer that 8 meters(about 25 feets).
3.6 POWER LINE SURGE PROTECTION
The GHX-308A Hybrid Key Telephone System should be equipped with a power-line transient surge protection device.
System equipped with such devices are more resistant to damage from power line surge than unprotected systems.
Power line surges often occur during switching operations and especially during violent thunderstorm activity.
Installation if a surge protector meeting the specifications described in the following paragraph with prevent or minimize
the damage resulting from power-line surges.
The surge protector shall be a 15 amp self-contained unit that plugs into a standard, grounded 110/220VAC wall oulet.
The wall outlet must be designed to accept a 3-prong plug(2 parallel blades and group pin). The protector should be fast
operating and capable of protecting for transients greater than 220/400 volts.
The AC power cord should not be plugged in at this time.
