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Installation and connection
4. Installation and connection
4.1 Fuses
Please observe the requirements of IEC 60364-7-710:2002-11 and DIN VDE 0100-710 (VDE
0100 Part 710) when selecting fuses for the supply cables and outgoing circuits of the
changeover modules:
Section: 710.512.1.6.2 (VDE), sections 710.5.3.1, 710.512.1.6 (IEC), Transformers for the IT system:
Where transformers, their primary supply conductor and secondary outgoing line are con-
cerned, overcurrent protective devices are only permitted for short-circuit protection. The
transformer supply cable from the changeover module and the transformer outgoing cable to
the next distribution board section should be laid so that they are short-circuit proof and earth-
fault proof.
Section: 710.53.2 (VDE), section 710.413.1 (IEC), Protection of the cable system in Group 2 loca-
tions: The choice of protective devices must ensure that when the anticipated short-circuit cur-
rent occur, the protective device upstream of a fault will selectively trip the protective devices
that are further upstream.
Section 710.537.6.2. (VDE), section 710.413.1.1 (IEC), Connecting several load groups down-
stream of a changeover module must not lead to all the load groups failing in the event of a
fault.
As a result, the choice of fuses F should ensure both short-circuit protection for the trans-
former and selectivity for the overcurrent devices connected downstream in the IT systems.
When selecting fuses, please observe both the maximum permissible values laid down by
the guidelines that apply to the location of use and national and international standards, in
order to ensure that the contactor contacts cannot weld. The considerations presented below
are based on the standard DIN VDE 0100-710 (VDE 0100 Part 710): 2002-11, section
710.537.6.
4.1.1
Selecting a fuse with only one load
TGH1322en/06.2009
All manuals and user guides at all-guides.com
F1
F2
2
2
Changeover module
Contactors with latching
Circuit breaker
15
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