4
Instruction Booklet
IB01900001E
Effective August 2017
Instructions for Magnum DS Metal-Enclosed
Low-Voltage ARC Resistant Switchgear Assemblies
EATON
www.eaton.com
1.3 Safety Practices
WARNING
MAGNUM DS LOW-VOLTAGE ARC-RESISTANT SWITCHGEAR ASSEMBLIES
ARE COMPLEX, HIGH CURRENT ELECTRICAL EQUIPMENT DESIGNED TO
OPERATE WITHIN THE VOLTAGE AND CURRENT LIMITATIONS SHOWN ON
THE NAMEPLATE. DO NOT APPLY THIS EQUIPMENT TO SYSTEMS WITH
VOLTAGES AND/OR CURRENTS IN EXCESS OF THESE LIMITS.
1. Only qualified electrical personnel familiar with the construction
and operation of this equipment and the associated hazards
should be permitted to work on such equipment. Additionally,
only qualified personnel should be permitted to install or operate
such equipment.
2. Always be certain that the primary and secondary circuits are de-
energized before attempting any maintenance.
3. For maximum safety, only insert a completely assembled breaker
into an energized cell. Front covers are safety features and must
be in place when energized.
4. While in the assembly, always ensure that drawout circuit bea-
kers are in one of three intended positions: “Connect”, “Test” or
“Disconnect”. A circuit breaker permitted to remain in an inter-
mediate position could result in control circuits being improperly
connected causing other equipment to malfunction.
5. Do not remove access covers unless the circuits to be exposed
are de-energized.
6. Use calibrated test equipment of known reliability to confirm that
all circuits are de-energized before servicing.
7. After maintenance, be certain every current transformer second-
ary circuit is completely connected or shorted.
DANGER
IF THE SECONDARY CIRCUIT OF ANY CURRENT TRANSFORMER IS LEFT
OPEN WITHOUT LOAD, AND ITS PRIMARY CIRCUIT IS ENERGIZED, A
DANGEROUSLY HIGH VOLTAGE IS DEVELOPED ACROSS TRANSFORMER
SECONDARY TERMINALS. TO PREVENT DEATH, BODILY INJURY OR
ELECTRICAL SHOCK, EITHER DE-ENERGIZE THE CIRCUIT BY OPENING THE
BREAKER, OR SHORT CIRCUIT CURRENT TRANSFORMER SECONDARY
TERMINALS, BEFORE ENERGIZING THE CIRCUIT AND PROCEEDING WITH
MAINTENANCE.
8. Always ensure all assembly hardware is in place and tightened
accordingly.
9. Verify that all doors are completely closed and latched.
WARNING
FAILURE TO FOLLOW THESE DIRECTIONS MAY VOID THE IEEE C37.20.7
ARC RESISTANT RATING, AND IN ADDITION RESULT IN DEATH, SERIOUS
BODILY INJURY OR PROPERTY DAMAGE.
1.4 Qualified Personnel
For the purpose of operating switchgear assemblies, a person who
has been thoroughly trained in the operation of power circuit break-
ers and any included instrumentation and who has complete knowl-
edge of the loads connected to the assembly may be considered to
be a qualified person.
For the purpose of installing, inspecting and maintaining switchgear
assemblies, a qualified person
MUST
also be a qualified electrician,
who is thoroughly trained in regard to recognizing and avoiding the
hazards inherent to working with electricity and in the proper way
to perform such work. The individual must be able to de-energize,
clear and lockout/tagout circuits in accordance with established
safety practices. In addition, the individual must be equipped with,
and trained in the use of, Personal Protective Equipment (PPE) (rub-
ber gloves, arc-flash clothes, etc.) for those occasions when it is not
possible to de-energize all circuits before doing maintenance work in
the area.
WARNING
WHEN WORKING ON ENERGIZED EQUIPMENT, THE ARC RESISTANT
RATING WILL BE VOIDED WHEN BOLTS ARE REMOVED AND WHEN DOORS
ARE UNLATCHED OR OPEN. THE ONLY EXCEPTION TO THIS RULE EXISTS
WHEN INSTRUMENT AND SECONDARY COMPARTMENT DOORS ARE
OPENED ON TYPE 2B INSTALLATIONS (SEE SECTION 1.1)
1.5 Other Publications and Documentation
In addition to this instruction manual, other printed information and
documentation is supplied with each assembly. This additional infor-
mation will include, but not necessarily be limited to, a Magnum DS
Low-Voltage Power Circuit Breaker instruction manual, arrangement
drawings, and connection diagrams. For additional references see
Section 4.
