NEC UNIVERGE NEAX 2000 IPS - Chapter 6 System Overview; Operating Environment; Grounding Requirements

CHAPTER 6 INSTALLATION, PROGRAMMING, AND MAINTENANCE
UNIVERGE NEAX 2000 IPS General Description Page 147
Issue 5
Chapter 6 System Overview
Operating Environment
Operating Condition Temperature Relative Humidity
Normal Operations
5
o
C - 30
o
C
41
o
F - 86
o
F
15% - 65%
Non-Condensing
Short Periods**
-0
o
C - 40
o
C
32
o
F - 104
o
F
15% - 90%
Non-Condensing
During Storage and Transit
-18
o
C - 50
o
C
0
o
F - 122
o
F
8% - 90%
Non-Condensing
**Not to exceed 72 consecutive hours or 15 days in a year.
Grounding Requirements
The system grounding must have a specific ground resistance and AC noise level, and is to be
connected to a predetermined terminal in the PBX. Standard grounding requirements are as
shown below:
 Communication grounding : Less than 10 ohm

Protective ground for PIM : Less than 10 ohm
Note: The AC ripple on these various grounds should be less than 0.5Vp-p.
The following specific requirements apply to ground wiring.
An equipment grounding conductor that is at least as large as the ungrounded branch-supply
conductors is to be installed as part of the circuit that supplies the PBX. Bare, covered, or
insulated grounding conductors are acceptable. Individually covered or insulated equipment
grounding conductors shall have a continuous outer finish that is either green, or green with one
or more yellow stripes. The equipment grounding connector is to be connected to ground at the
service equipment.
The attachment-plug receptacles in the vicinity of the PBX are all to be of a grounding type, and
the equipment grounding conductors serving these receptacles are to be connected to earth
ground at the service equipment.
CAUTION
Grounding circuit continuity is vital for safe operation of telecommunication
e
q
ui
p
ment. Never o
p
erate this e
q
ui
p
ment with the
g
roundin
g
conductor