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Instructions for installation, operation, and
maintenance of 38 kV type VacClad-W,
150 BIL switchgear indoor housings
1.5 Safety precautions
Only qualified electrical personnel with training and experience on
high voltage apparatus shall be permitted to work on this equipment .
They shall be familiar with the work to be performed, as well as
industry and local safety procedures and standards .
1 . Read and understand these instructions and any additional
instructions identified in this document before attempting instal-
lation, operation, or maintenance of the switchgear assembly .
2 . Disconnect all low voltage and medium voltage power sources
to the switchgear assembly before working on the equipment
per Occupational Safety and Health Act (OSHA) and lockout pro-
cedures . Verify that the voltage has been removed . Ground load
and line side connections . Observe National Electrical Code
(NEC), OSHA, and local procedures and standards . This includes
visual inspections while the door is open, making any adjust-
ments inside or outside the enclosure, performing maintenance,
or installing replacement parts .
3 . Never leave a breaker or transformer drawer in an intermediate
position in its compartment . Always crank the breaker or trans-
former drawer to the fully connected position, the "Test" posi-
tion, or fully "Withdrawn" position . Do not attempt to open the
door unless the breaker is in the disconnect position .
4 . Never try to disconnect or open the secondary circuit of a cur-
rent transformer that is carrying load current . In this situation,
the transformer develops a dangerous high voltage .
CAUTION
BEFORE ATTEMPTING ANY WORK, EITHER DE-ENERGIZE THE CIRCUIT
BY OPENING THE BREAKER OR SHORT-CIRCUIT THE SECONDARY OF THE
CURRENT TRANSFORMER.
5 . The user is responsible for conforming to all applicable code
requirements with respect to grounding the switchgear assembly .
CAUTION
BEFORE ENERGIZING THE SWITCHGEAR ASSEMBLY, ENSURE THAT THE
FOLLOWING ITEMS 6 THROUGH 10 ARE TRUE.
6 . The switchgear assembly is secured on a true and level surface
according to the floor plan of the customer drawings .
7 . Confirm all hardware is in place and torqued per Section 2 .3,
Table 3 .
8 . Confirm that no tools or objects are left inside the enclosure .
9 . Confirm that all devices, covers, doors, panels, and so on, are in
place .
10 . Before start-up, perform a field power frequency withstand
(Hi-Pot) test, using test voltages given in Table 1 .
Table 1. Power Frequency Withstand Test Voltages.
Rated Maximum Voltage (kV)
4.76
8.25
15.0
27.0
38.0
11 . For additional safety information and safe-use practices for your
VCP-W circuit breaker, refer to IB3A74792 .
Power Frequency Withstand (rms) (kV)
14.25
27
27
45
60
Section 2: Installing indoor switchgear
For information regarding the receiving, handling, storing, and instal-
latioin of the equipment, please reference IB022014EN: Instructions
for receiving, handling, storing, and installation of medium voltage
switchgear, in addition to the customer drawing package .
Instruction booklets and drawings are located inside the upper com-
partment door of the first vertical section and online at
www .eaton .com .
The detail box contains kits, bus, splice plates, boots, tape kits for
taping cable to riser joints, and the hardware required for installation
of the switchgear .
2.1 Floor requirements
®
The finished foundation surface shall be flat and level within
0 .06 in . (1 .6 mm) in 36 in . (914 mm) in any direction, left to right,
front to back, and diagonally . Alternatively a local flatness "FF"
value of 50 or higher and an accompanying "FL " value of 37 to 40 as
defined in industry standard ASTM-E1155-96 and industry standard
ACI 117-90 may be used to establish the flatness and levelness of
the finished foundation .
2.2 Power cable installations or close-coupling with other
equipment
When connecting power cables to metal-clad switchgear, or when
connecting metal-clad switchgear to other equipment (for example,
MV MCC, power transformer, non-seg bus duct), all connection
points must be insulated after the connections are made (refer to
the section on Field taping procedure for general guidance), and
minimum electrical clearances between live parts in adjacent phases
(phase-to-phase) and from live parts to ground (phase-to-ground) as
recommended in Table 2, must be maintained to preserve dielectric
withstand capability of the metal-clad switchgear .
Table 2. Minimum Clearance Chart for Insulated Connections.
kV Rating of the MVS
Switchgear
38
Instruction Booklet IB02201004E
Effective October 2017
Phase-to-Phase
Phase-to-Ground
in. (mm)
in. (mm)
8.25 (209.6)
8.25 (209.6)
EATON www.eaton.com
Revision #4
5
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