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IB01602007E
Instruction Bulletin
Page
16
Effective: June 2003
O&M Manual for
Non-Automatic Transfer
Switches (30 – 1200 Amperes)
4.4 Vertical Design Load Lug Location
Transfer switch equipment is supplied as standard from the
factory with its load terminal lugs at the top. If the load lugs
are to be repositioned to the bottom, do it at this time before
wiring the unit or making power cable connections.
With the solid steel shield removed, proceed with the
following steps (Figure 4):
Step 1: Disconnect the power panel from the rest of the
transfer switch by unplugging the connector plugs
(S1, S2 and S3) (Figure 15).
Step 2: Remove the bolt that bonds the neutral strap to the
rear of the enclosure, if it is in place.
Step 3: Remove the four bolts that secure the power panel
in the enclosure. Depending upon the size of the
panel, it may be advisable to have assistance with
the removal. Once the power panel is free, carefully
move it to a solid work surface (Figure 6).
Figure 14. Vertical Design Load Lug Assembly Shown Mounted
At this point, take the time to refer to Figure 13 and become
familiar with the inside rear of the enclosure and the power
panel mounting provisions available for both top and bot-
tom entry. It will facilitate re-installation of the power panel.
Step 4: Remove the operating mechanism from the front of
the power panel by removing the six bolts holding
the mechanism in position. The molded case
switches or optional circuit breakers do not have
to be removed (Figure 8).
The rear mounted load lugs, dip insulated bus bars, standoff
insulators, glass polyester phase barriers, and metal mount-
ing bracket are designed to be removed as one load lug
assembly (Figure 14).
Step 5: The load lug assembly, just mentioned, is removed
by first removing the six or eight bolts securing
the pieces of insulated bus to the back of the power
panel. The number of mounting bolts depends
upon whether 3- or 4-pole devices are installed.
Mounting bolts are accessed through holes in the
load end of the molded case switches or optional
circuit breakers.
Step 6: Next, remove the 4 bolts holding the mounting
bracket to the upper rear portion of the power
panel. The load lug assembly can now be removed
as one unit.
Note: There are grooves in the back of the power panel
and in the mounting bracket that keep the polyester phase
barriers in their proper positions.
WARNING
IF THE LOAD LUG LOCATION IS BEING CHANGED ON
ALREADY INSTALLED TRANSFER SWITCH EQUIPMENT,
MAKE SURE THAT THE NORMAL, EMERGENCY AND
OTHER POWER SOURCES CONNECTED TO THE EQUIP-
MENT ARE DE-ENERGIZED. HAZARDOUS VOLTAGES ARE
PRESENT INSIDE TRANSFER SWITCH EQUIPMENT AND
CAN CAUSE SEVERE PERSONAL INJURY OR DEATH.
NOTICE
NOTICE
