Powell FlexTrol Class E2, Instruction Bulletin

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01.4IB.46300
Installation
FlexTrol
™
Class E2 Medium Voltage Controllers with
Eaton Contactor
n. i
nsulating
p
riMary
c
aBles
All field assembled joints for primary cable
terminations should be prepared as outlined
under Ch 4 Installation, I. Connections . Upon
completion of the cable termination, care
must be exercised when taping the exposed
termination.
Ch 4 Installation, J. Main Bus Assembly Insulation ,
can be used for guidance in insulating
techniques. However, in all cases, carefully
follow the manufacturer’s recommendations
for insulating the type of cable termination
being used.
o. g
rounD
F
ault
c
urrent
t
ransForMers
(t
HrougH
t
ype
)
Through-type current transformers are
furnished where specified for sensitive
protection against ground faults. These
transformers may be installed above or below
the power cable entrance, so that the primary
cable or cables can pass through them.
When lead or other conducting sheath cable
or cable with shielding tape or braid is used,
it is recommended that the sheath or shield
be grounded solidly to the switchgear ground
bus. The ground lead should be bonded to
the sheath or shield on the side of the current
transformer away from the primary terminals.
p. c
ontrol
c
aBles anD
c
onnections
The low voltage compartment
(Figure 18) where control connections are made
is completely isolated from the high voltage
compartment. Available space for both the
top and bottom control wiring conduits are
designed for easy accessibility. Conduits should
be placed in accordance with the outline
drawings.
Figure 18 Low Voltage Compartment
a
a. Low Voltage Compartment Door
Control connections are made through
terminal blocks in the low voltage
compartment. Refer to the schematic and
wiring diagrams furnished for each specific
job for connection of all field control wires to
the designated terminal blocks. A continuous
horizontal wire way opening (Figure 19) ,
located at the top, allows for electrical control
interconnections between the vacuum
contactors throughout the vertical sections.
Figure 19 Wire Way
a
a. Wireway