Page 3-89
Installation
INTER-TEL
®
AXXESS
®
MANUAL VERSION 11.0 – May 2008
Equipment Chassis Grounding
INSTALLATION
3
9.12 To ground the system (see Figure 3-46 on the following page):
1. Ensure that the system’s AC power source is properly grounded. DO NOT defeat (or
leave floating) the ground wire in the AC power cord.
2. For a U.S. system only, install an AC surge/spike protector with a built-in ground lug
and connect it to:
a. The ground lug (indicated by the symbol ) on the left, inside wall of the equip-
ment chassis.
b. The ground lug (indicated by the symbol ) on each Single-Line Adapter, if
used.
c. Battery compartments, if used.
d. Trunk gas discharge tubes, if used.
9.13 If AC power-related problems appear on the system while in operation, one of the fol-
lowing three methods can be used to test the ground.
• Use a digital multimeter to measure the difference of potential between the chassis
ground point and the power neutral, and between the chassis ground point and the third
wire ground. If the voltage measurement exceeds 0.5V, noise may develop on the sys-
tem. If this occurs, call an electrician.
• Use a Megger to test the ground point. (A Megger should be available through the local
power company.) The reading should be 5 ohms or less.
• (For a U.S. system only) Unplug the AC power cord from the outlet and insert a ground
isolation plug into the outlet. Plug the AC power cord into the ground isolation plug. If
the problem ceases, call an electrician. When finished, remove the ground isolation plug
to restore ground protection.
NOTE: For information about how to properly ground Inter-Tel telephone systems or updated
ground information, refer to the Inter-Tel System Equipment Grounding Guidelines (part no.
835.2845).
Figure 3-46. Equipment Chassis Grounding
CHASSIS
GROUND
#10 (6 mm2) GROUND
SURGE/SPIKE PROTECTOR
WITH GROUND LUG
AC OUTLET
GOOD GROUND
LUG
WIRE
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