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AD-25182501CHAPTER 3
Page 10
Revision 1.0.1
CHAPTER 3 INSTALLATION PROCEDURE
1. PRECAUTIONS
1.1 Power, Ground Cabling and LIU (for Australia)
(a) The power and ground cabling is to be installed only by an AUSTEL Licensed Contractor.
(b) The G.P.O. which provides the AC power should be on a dedicated circuit, and must be installed near the
PABX in an easily accessible position.
(c) An appropriate AUSTEL Approved Line Isolation Unit (LIU) is to be installed at I/O ports, as indicated in
Figure 2-1.
1.2 Grounding Requirements
The system protective grounding must have a specific resistance and AC noise level, and is to be connected to a
pre-determined terminal in the PABX, by use of a custom-built AC power cord. The TRC Earth connects to the
“GND” terminal on the PZ-PW86 power unit in every
PIM.
Standard grounding requirements are as shown below:
• Communication grounding: Less than 1 ohm. See figure 3-1 below.
• Protective ground for PIM: Less than 1 ohm. [Provided in the AC power cord(s)].
• Grounding to the Line Protection units on the MDF: Less than 0.1 ohm
Note:
The AC ripple on these various grounds should be less than 0.5 Vp-p.
Figure 3-1 TRC Earth Wiring
CAUTION
Grounding circuit continuity is vital for safe operation of telecommunication equipment. Never operate this
equipment with the grounding conductors disconnected.
GND
PZ-PW86
GND
PZ-PW86
GND
PZ-PW86
GND
PZ-PW86
GND
PZ-PW86
GND
PZ-PW86
GND
PZ-PW86
GND
PZ-PW86
PIM3
PIM2
PIM1
PIM0
PIM7
PIM6
PIM5
PIM4
TO TRC EARTH.