Eltek PRS Quick Start Manual page 19

Earthing
About AC, DC Earthing Systems
To prevent the risk of electric shock, all cabinet's chassis are to be electrically connected to AC
Earth (PE). Also, it is a common practice for telecom equipment to have its common DC output
rail (+ or -) connected to a separate "Telecom Earth" (TE) or DC Earth.
Earth connections are in particular important where frequent lightning might induce high
voltage levels in AC supply and in battery and load cables.
PE (Protective Earth)
TE (Telecom Earth)
EG (Exchange Ground)
AC Earth (PE) and DC Earth (TE) are usually connected to chassis via "Link 1" and "Link 2".
Remove the links ("floating earth") for compliance with other local earthing systems. Refer to
your system's specific drawings to identify how these links are implemented in your DC power
system.
Common Positive DC Output Rail is usual in 48 and 60V DC supply systems: Negative DC
Distribution. Common Negative DC Output Rail is usual in 24V systems: Positive DC
Distribution.
Quick Start Guide Flatpack PS System
AC Mains
PE
Chassis
Common DC Rail +
—
—
—
—
Negative DC
Distribution
356803.103, v4-2006-10
Miscellaneous
Link 2
Chassis
(DC Earth)
Common
DC Rail
EG
Link 1
(AC Earth)
Cabinet
Common DC Rail —
+
Positive DC
Distribution
TE
.
DC Load
Circuit
+
+
+
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