NEC 120 manual Precautions, Power, Ground Cabling and LIU for Australia, Grounding Requirements

Models: 120

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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.

PIM3

PIM2

PIM1

PIM0

PZ-PW86

GND

PZ-PW86

GND

PZ-PW86

GND

PZ-PW86

GND

PIM7

PIM6

PIM5

PIM4

PZ-PW86

GND

PZ-PW86

GND

PZ-PW86

GND

PZ-PW86

GND

TO TRC EARTH.

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.

CHAPTER 3

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NEC 120 manual Precautions, Power, Ground Cabling and LIU for Australia, Grounding Requirements

120 specifications

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