3
Instruction Booklet
IB01900002E
Effective June 2011
Instructions for Magnum DS Metal-Enclosed
Low-Voltage NEMA 3R Assemblies
EATON CORPORATION
www.eaton.com
1.2 Safety Features
Each Magnum DS Assembly is manufactured with built-in interlocks
and safety-related features. They are provided to reduce hazards to
operating personnel and provide proper operating sequences.
DANGER
METAL-ENCLOSED LOW-VOLTAGE ASSEMBLIES ARE PROVIDED WITH
MANY SAFETY FEATURES. NEVERTHELESS, WHEN CONNECTED THEY
CONTAIN POWER CIRCUITS WITH HIGH FAULT CAPACITY. THE VOLTAGES
AND POWER LEVELS AVAILABLE IN THIS EQUIPMENT MAKE CONTACT
WITH BARE CONDUCTORS OR TERMINALS EXTREMELY DANGEROUS,
AND IS LIKELY TO BE FATAL. ALL POWER SHOULD BE TURNED OFF OR
APPROPRIATE PROTECTIVE EQUIPMENT USED WHEN WORKING ON SUCH
EQUIPMENT. IN ADDITION TO THE HAZARDS INHERENT TO THE LOW-
VOLTAGE ASSEMBLY ITSELF, OPERATION BY UNQUALIFIED PERSONS MAY
CAUSE INDIRECT DAMAGE TO CONNECTED EQUIPMENT AND INJURY TO
OPERATORS OF CONNECTED EQUIPMENT
UNDER NO CIRCUMSTANCE SHOULD THE INTERLOCKS OR OTHER SAFETY
FEATURES BE MADE INOPERATIVE OR DISABLED, AS THIS MAY RESULT IN
DEATH, BODILY INJURY OR PROPERTY DAMAGE.
TO PROTECT PERSONNEL DURING THE INSTALLATION, OPERATION
AND MAINTENANCE OF THIS, THE FOLLOWING PRACTICES MUST BE
FOLLOWED:
1.3 Safety Practices
WARNING
MAGNUM DS LOW-VOLTAGE SWITCHGEAR AND SWITCHBOARD
ASSEMBLIES ARE COMPLEX, HIGH CURRENT ELECTRICAL EQUIPMENT
DESIGNED TO OPERATE WITHIN THE VOLTAGE AND CURRENT
LIMITATIONS SHOWN ON THEIR RESPECTIVE NAMEPLATES. 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 be certain that all assembly hardware is in place and
bolted tightly before inserting a drawout circuit breaker into its
compartment.
WARNING
FAILURE TO FOLLOW THESE DIRECTIONS MAY RESULT IN DEATH, SERIOUS
BODILY INJURY OR PROPERTY DAMAGE.
1.4 Qualified Personnel
For the purpose of operating switchgear and switchboard assem-
blies, a person who has been thoroughly trained in the operation of
circuit breakers and any included instrumentation and who has com-
plete knowledge of the loads connected to the assembly may be
considered to be a qualified person.
For the purpose of installing, inspecting and maintaining switchgear
and switchboard assemblies, a qualified person
MUST
also be a
qualified electrician, who is thoroughly trained in regard to recogniz-
ing 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) (rubber 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.
1.5 Precautions
1. If relays are included, remove all blocking. Check control circuits
(except voltage and current transformer circuits) for grounds and
short circuits before applying control power.
2. Connect the assembly to the station ground before applying any
power
3. In case of fire, do not use liquid fire extinguisher until all circuits
have been disconnected.
4. If an assembly is to be stored for an extended period prior to
installation, provisions must be made for energizing the space
heaters to prevent condensation of moisture inside the assem-
bly.
1.6 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 6.
