Installing the SH9HU, SH7HU, SH7HU-R and 1HU Equipment Shelves
140
Installation and Commissioning Manual
F
S
P
3000R
7 R
11
.1 8000
0015930
Issue
B
, ©
2012
ADVA AG Optical Netw
orking
ADVA Conf
idential
Earthing a Shelf
This section describes how to build individual earthing conductors and how to
earth an FSP 3000R7 shelf to the rack or cabinet.
The earthing of the 7HU shelf types and 1HU shelf types is functional earthing
and required for correct operation and to gain a high electromagnetic interfer-
ence (EMI) immunity. The 9HU shelf (SH9HU) and 1HU shelf high power
(SH1HU-HP/2DC) are designed in accordance with protection class 1. These
shelves must therefore be operated with only a protective earth (ground) con-
nection.
The term shelf used in the following refers to all FSP 3000R7 shelf types to be
earthed. To meet safety and EMI requirements each FSP 3000R7 shelf must
individually be connected to the rack’s or cabinet’s earth point. For this purpose,
each shelf provides one earthing terminal and two earth screws located on one
side panel or the back panel of the shelf.
Prior to rack-mounting the shelf, the protective earthing conductor or the func-
tional earthing conductor must be attached to the shelf. There might be no
space for installation works after the shelf has got mounted into the rack.
For convenience the protective earthing conductor or the functional earthing
conductor (depending on the earthing system) is called earthing conductor
below.
The length of the earthing conductor depends on the location of the shelf within
the rack and its proximity to the rack’s earth point. Therefore you must build indi-
vidual earthing conductors with the appropriate connectors on both ends.
The following sections are covered:
Building an Earthing Conductor
Special Knowledge Required
Personnel who is employed in earthing a shelf must be trained as an electrician
and must know the national earthing (grounding) systems, standard electrical
safety as well as electrical wiring and connection practices used in the installa-
tion of electrical equipment.
Personnel must possess the skills and experience for this purpose and must
have knowledge of at least the following electrical codes and standards: IEC/EN
60950-1, EN 50110-1-2, ETSI EN 300132-2, ETSI EN 300253 and EN 50310.
Knowledge of relevant local and national electrical codes is imperative if men-
tioned standards are not available. Note that regulations for earthing systems
may vary considerably among different countries.
P
S
Note
The term earth or earthing used throughout the Installation and
Commissioning Manual is the direct equivalent of the North American
term ground or grounding.