5
Instruction Booklet
IB01900001E
Effective August 2017
Instructions for Magnum DS Metal-Enclosed
Low-Voltage ARC Resistant Switchgear Assemblies
EATON
www.eaton.com
Section 2: Receiving, Handling & Storage
NOTICE
FOR COMPLETE RECEIVING, HANDLING AND STORAGE INSTRUCTIONS,
SEE SECTION 2 OF THE PRIMARY INSTRUCTION BOOK IB01901001E,
REFERENCED ELSEWHERE IN THIS PUBLICATION. INSTRUCTIONS
WHICH FOLLOW EMPHASIZE THE UNIQUE FEATURES ASSOCIATED WITH
MAGNUM DS ARC RESISTANT SWITCHGEAR.
2.1 Shipping Skid Removal
The wooden shipping skid bolted to the bottom of an indoor assem-
bly must be removed before the equipment is placed in its perma-
nent location. Lag bolts attach the shipping skids to the assembly
from the inside: typically six bolts per vertical section of rear-acces-
sible assemblies; four bolts per vertical section of front-accessible
assemblies. The holes that remain in the equipment after the skids
and lag bolts are removed are used in securing the indoor assembly
permanently in position. See Section 4 of IB01901001E and base
plan drawing 4A37896 for intended lag locations for various assem-
bly configurations.
To access the rearmost lag bolts on rear-accessible Arc Resistant
switchgear, it will be necessary to remove the dynamic flap cage
from the rear frame. To remove the cage, remove the two screws
that hold the cage in place (Figure 2). Take care not to lose the
screws as these will be required when reinstalling the cage.
Remove the shipping lag bolts. After permanent installation, rein-
stall the cage using the original screws. Avoid over tightening the
screws during installation as this could result in stripping of the
threads in the steel. It is crucial to reinstall the cage to ensure the
dynamic flap will perform as required for the arc resistant rating.
Verify that the dynamic flap floats freely after installation of the cage.
WARNING
FAILURE TO REINSTALL ANY DYNAMIC FLAP ASSEMBLY AS DESCRIBED
ABOVE WILL VOID THE IEEE C37.20.7 ARC RESISTANT RATING.
For front-accessible Arc Resistant Switchgear, the dynamic flap cage
does not obstruct access to the lag bolts.
Figure 2. Rear-Frame Dynamic Flap Cage Assembly.
WARNING
THE ARC RESISTANT RATING IS ONLY VALID WHEN ALL FLOORPLATES ARE
PRESENT AND PROPERLY ATTACHED. FLOORPLATES REMOVED DURING
INSTALLATION OF THE SWITCHGEAR, INSTALLATION OF CONDUIT HUBS
(FOR BOTTOM CABLE ENTRY) OR FOR ANY OTHER PURPOSE MUST BE
REINSTALLED PRIOR TO ENERGIZING THE EQUIPMENT. FAILURE TO DO SO
WILL VOID THE IEEE C37.20.7 ARC RESISTANT RATING.
Section 3: Equipment Description
3.1 General Description
The following descriptions apply to standard low-voltage metal-
enclosed Arc Resistant construction and wiring. Special features and
control schemes are often incorporated per customer specifications.
These special features are evident and portrayed on the drawings
and diagrams for the specific assembly received. Instructions on
included apparatus such as relays, instruments, control switches and
circuit breakers are included elsewhere in separate instruction books
or sheets.
Each low-voltage (600 volts and below) metal enclosed Arc Resistant
switchgear assembly is factory assembled and tested. It is designed
to require a minimum amount of labor for installation.
Each Arc Resistant assembly is a stationary structure with a mini-
mum width of 60”, consisting of vertical sections mechanically and
electrically joined to make a single coordinated installation.
In rear-accessible units, a vertical section consists of three major
divisions: the front breaker compartment, bus compartment, and
cable compartment. In front-accessible units, the three divisions are
redistributed between a pair of vertical sections: front breaker com-
partment/bus compartment in one portion; cable compartment/bus
compartment in the remaining portion.
When no exhaust plenum and duct is installed (see Section 3.6), the
Arc Resistant assembly must be installed such that no obstruction
resides above the assembly at a distance less than 10 ft (3.05 m)
from the base of the assembly (Figure 5). This includes ceilings, as
well as cable trays or any other obstruction that, in the event of an
internal arc, would impede the escape of internal pressure, gasses
and debris through the roof-mounted pressure relief flaps.
Arc Resistant switchgear has many specialized components
designed to protect the operator in the unlikely event an electrical
arcing event occurs within the switchgear. These components are
designed to prevent any arc gasses from escaping around the acces-
sible perimeter of the enclosure and to direct these gases out the
top of the enclosure via pressure relief flaps or an exhaust duct.
DANGER
FOR TYPE 2, THE ARC RESISTANT RATING IS ONLY VALID WHEN
ALL DOORS ARE CLOSED AND PROPERLY LATCHED, INCLUDING THE
INSTRUMENT COMPARTMENT (CONTROL COMPARTMENT) DOORS. THE
TYPE 2B OFFERING ALLOWS FOR THE INSTRUMENT COMPARTMENT
(CONTROL COMPARTMENT) DOORS TO BE OPENED WHILE STILL
MAINTAINING THE ARC RESISTANT RATING. IT IS IMPORTANT TO
ENSURE THAT THE DOOR IS PROPERLY CLOSED AND LATCHED WHEN AN
OPERATOR IS NOT WORKING IN THIS CELL.
3.2 Instrument (Auxiliary) Components
Instrument compartments are used to mount passive and active
control components and other auxiliary devices. The compartment
has a hinged front door that may be used for mounting a variety of
devices.
3.3 Breaker Cells (Draw-Out)
CAUTION
FAILURE TO HAVE ANY DRAWOUT BREAKER COMPLETELY IN THE
DISCONNECT POSITION BEFORE RACKIN-IN CAN CAUSE SERIOUS
EQUIPMENT DAMAGE. ENSURE THAT THE BREAKER REACHES A POSITIVE
STOP WHEN INSERTING INTO THE CELL PRIOR TO RACKING.
