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2.2.2 Equipment Grounding
Equipment grounding is primarily for safety. Correct implementation of grounding also enhances
equipment performance. All power feeders must include equipment grounding means as
required by the NEC and local codes.
An insulated ground conductor is recommended to be run in each feeder conduit. Ground
conductors must be at least the minimum size per NEC Table 250-66. Larger wire sizes may be
used for increased system performance.
If the input power feeder conduit is used as a grounding conductor, adequate electrical continuity
must be maintained at all conduit connections.
WARNING
Risk of electric shock. Can cause equipment damage, improper operation, injury and death.
Isolating bushings must not be used in a metal conduit run. These busings might prevent
the system from being properly grounded.
2.2.3 Grounding Electrode Conductor for Liebert EXM Distribution Cabinets with
Transformer
Required by code - The Liebert EXM
according to the safety practices of NEC 250-26. A local grounding electrode conductor is
recommended in addition to the equipment safety ground which is normally run with the input
power conductors. (See Figures 8 through 13.)
2.2.4 Output Power Connections
Output circuit breaker(s) and/or panelboards with ground and neutral provisions are provided
inside the unit for connecting load(s) as required. (See Figures 8 through 13.)
WARNING
Risk of electric shock and arc flash. Can cause injury and death.
Verify that all incoming line voltage (power) and low-voltage (control) circuits are
de-energized and locked out before installing cables or output breakers or making
connections, whether in the junction box or in the unit.
Verify that incoming line voltage circuits are de-energized and locked out before installing
output breakers and cables.
Code Compliance—All output cables and connections must comply with the NEC and all other
applicable codes.
Vertiv
| Liebert
Distribution Cabinet
™
®
with transformer must be grounded
Distribution Cabinet
for Liebert EXM
User Manual |
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