U 07C02 SO

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					                  UNITED STATES MARINE CORPS
                       MARINE CORPS ENGINEER SCHOOL
                      UTILITIES INSTRUCTION COMPANY
                                 PSC 20069
                 CAMP LEJEUNE, NORTH CAROLINA 28542-0069

                ELECTRICAL DISTRIBUTION EQUIPMENT
                 CHARACTERISTICS AND CAPABILITIES
                          STUDENT OUTLINE

                                                           U-07C02
                                                            FEB 11
                   What Will I Learn This Class?

1. Terminal Learning Objectives.

    a. As part of a team, with electrical support plan and
established Course of Action (COA), equipment, tools and
references, install a power distribution system (MEPDIS/
MEPDIS-R/Busbar) so unit's mission is supported per the
commander's intent and distribution system is set up in
accordance with FM 5-424 and equipment technical manuals.
(1141-XENG-1624)

    b. At a temporary field structure(s), with electrical
support plan and established Course of Action (COA),equipment,
tools and references, install a field wiring harness so unit's
mission is supported per the commander's intent and wiring
harness is installed in accordance with FM 5-424 and
TM 09049A-12&P/1. (1141-XENG-1646)

2.   Enabling Learning Objectives.

    a. With SL-3-6110, a list of MEPDIS-R components, and a list
of characteristics, match the components to their characteristics
per SL-3-6110. (1141-XENG-1624a)

    b. With SL-3-09124A/09125A/09127A, a list of MEPDIS
components, and a list of characteristics, match the components
to their characteristics per SL-3-09124A/09125A/09127A.
(1141-XENG-1624b)

    c. With references and a list of uses, identify the three
most common uses for a bus bar per FM 5-424. (1141-XENG-1624c)

    d. With SL-3-09049A, a list of MLK-0000 Field Wiring Harness
components, and a list of characteristics, match the components
to their characteristics per SL-3-09049A. (1141-XENG-1646a)




                                  SO 1
                        Let's Get Started!


1.   MOBILE ELECTRIC POWER DISTRIBUTION SYSTEMS CAPABILITIES.

    a. As Marine electricians, we must integrate our mission of
providing power with the quick, expeditionary, expectations of
the mission we support. In years past, Marines used equipment
that looked similar to the distribution you see overhead today in
power lines. With the introduction of the Mobile Electric Power
Distribution System (MEPDIS) and now the Mobile Electric Power
Distribution System Replacement (MEPDIS-R), Marines are able to
augment the same overhead single and three phase power support,
into a ground laid network of distribution panels and lightweight
cables.

    b. There are a total of nine distribution panels between
the two systems, ranging from 300kW to 5kW. These panels are
similar to the service panels found in houses and commercial
buildings. Just as those service panels have circuit breakers to
control power flow into various areas, these panels contain the
same materials, enclosed in water resistant cabinets so they can
be used in any environment. Through weather resistant input and
output connections, a series of cables is used to interconnect
the panels, to create a field expedient power grid.

2. MOBILE ELECTRIC POWER DISTRIBUTION SYSTEM REPLACEMENT
(MEPDIS-R).

    a. The MEPDIS-R, was developed to provide a faster, mobile,
and a more flexible means of distributing electricity. MEPDIS-R
has many similarities to the original MEPDIS, however; there are
some significant differences that make it more user friendly.
The breakers are magnetically induced breakers vice heat
sensitive. They use IEC connectors vice metal hubs which can be
purchased world wide. MEPDIS-R breaks down to smaller panels to
reduce your voltage drop. MEPDIS-R also has multiple inputs
allowing you to use the panels to parallel generator sets
together with a means of disconnect to permit load sharing and
exchange. The MEPDIS-R power distribution box provides multiple
output connectors to allow the connection of other power
distribution boxes to create a Power Distribution System. The
larger boxes from 300kW to 15 kW all contain internal cooling
fans to prevent overheating in extreme conditions. Because these
fans are located on the bottom of the box, caution should be
taken when placing the boxes into service in areas where the fan
can become blocked by debris, or suck debris into the box.




                               SO 2
        (1) The 300kW Power Distribution Box has three (3) 400
amp inputs to permit load paralleling and load transfer; two
(2)400 amp outputs; two (2) 100 amp outputs; and one (1) 120VAC,
single (1) phase GFCI covered duplex receptacle.




        (2) The 100kW Power Distribution Box has two (2) 400 amp
inputs to permit load paralleling and load transfer; one (1) 200
amp output; four (4) 100 amp outputs; two (2) 60 amp outputs; two
(2) 30 amp outputs; two (2) 20 amp 3 phase outputs; two (2) 20
amp 1 phase outputs; and one (1) 120VAC, single 1 phase GFCI
covered duplex receptacle.




                              SO 3
        (3) The 30kW Power Distribution Box has two (2) 100 amp,
3 phase inputs to permit load paralleling and load transfer; four
(4) 60 amp, 3 phase outputs; two (2) 30 amp, 3 phase outputs; two
(2)20 amp, 3 phase outputs; two (2) 20 amp, 1 phase outputs; and
one (1) 120VAC 1 phase, GFCI covered duplex receptacle.




      (4) The 15kW Power Distribution Box has two (2) 60A input
connectors to permit load paralleling and load transfer. The
panel provides four (4) 30A 3-phase, four (4) 20A single-phase
output connectors, and one (1) 120VAC 1 phase, GFCI covered
duplex receptacle.




     (5) (5) The 5kW Non-GFCI outdoor Power Distribution Box is
part of the MEPDIS-R system. The 5kW Outdoor Power Distribution
Box has one (1) 30 amp, 3 phase input and six (6) 20A and three
(3) 30A single phase outputs. The output cords each provide (4)
15A receptacles to power tent lighting, conveniences, or other
equipment.




                              SO 4
            (a) Cords. 6 Cord sets, 50 ft ea, 20 Amp Plug, each
with (4) 5-15R Receptacles. 3 Cord sets, “Y” configuration, 50’
ea, 20 Amp Plug with (2) 25’ legs, each with (2) 5-15R
Receptacles. Each cord set length is 75’ overall.




        (6) The 5kW GFCI protected, Indoor model Power
Distribution Box is part of the MEPDIS-R system.   The 5kW Indoor
Power Distribution Box has one (1) 30 amp, 3 phase, input and
nine (9) GFCI-protected single-phase 15A receptacles to power
tent lighting or other equipment. It is designed to be deployed
in a tent or sheltered environment

            (a) Cords: 6 Cord Sets, 50 ft ea, 5-20 Plug to 5-15R
Receptacles (4 per cord).




3.   MOBILE ELECTRIC POWER DISTRIBUTION SYSTEM (MEPDIS).

    a. The Mobile Electric Power Distribution System, which is
referred to as MEPDIS, was developed to provide a faster, more
mobile, and safer means of installing an electrical distribution
system. The MEPDIS can be effective only if you know how to use
it, but first you need to understand its components. The MEPDIS
is used to provide a network for connecting multiple 120/208V, 3
phase loads and 120V, 1 phase loads to a remote generator power
or facility power source. The MEPDIS consists of 15kW, 30kW, and
100kW power distribution panel board assemblies. These assemblies
are skid mounted; the 30kW and 100kW assemblies have eye bolts
for lifting and towing. The assemblies are housed in a water


                               SO 5
resistant cabinet that protects the circuit breakers and wiring.
The circuit breakers are accessed by unlatching and raising the
hinged cabinet cover. Input and output receptacles are also
protected by covers. The individual power board assemblies are
linked together by cables which allow for a wide range of
configurations.

       (1) 100kW Panel.

           (a) •120/208, 3 ph 5 wire, 350 amp main breaker

           (b) •2-3ph, 20 amp 120/208 outputs

           (c) •4-3ph, 30 amp 120/208 outputs

           (d) •2-3ph, 60 amp 120/208 outputs

           (e) •2-3ph, 100 amp 120/208 outputs




       (2) 30kW Panel:

           (a) •120/208, 3 ph 5 wire, 100 amp main breaker

           (b) •4-3ph, 60 amp 120/208 outputs

           (c) •2-3ph, 30 amp 120/208 outputs

           (d) •2-3ph, 20 amp 120/208 outputs

           (e) •2-1ph, 20 amp 120 outputs




                              SO 6
          (3) 15kW Panel:

              (a) •120/208, 3 ph 5 wire, 60 amp main breaker

              (b) •2-3ph, 20 amp 120/208 outputs

              (c) •9-1ph, 20 amp 120 outputs




4.   MEPDIS & MEPDIS-R SAFETY FEATURES.

     a.   All circuits are on circuit breakers

    b. All single phase 20 amp circuits have GFCI circuit
Breakers

     c.   Each cable has multiple ground wires

    d. The 100kW and 30kW MEPDIS panels have electronic locking
solenoids that lock when the unit is in operation

    e. The 300kW and 100kW MEPDIS-R are equipped with lockable
disconnect switches

5.   FIELD EXPEDIENT ELECTRICAL DISTRIBUTION PANEL (BUS BAR).

    a. A bus bar is a fabricated power distribution center. It
is used when the equipment requiring power is so widely scattered
that two or more branch feeders are required.

    b. It can also be used to connect two or more generator sets
in parallel if the load requirements are greater than what a
single generator set can supply.

    c. Also by utilizing a bus bar, one generator set can be
brought on line simultaneously as one is dropped off line in case
problems arise with a generator set.




                                SO 7
6.   FIELD WIRING HARNESS.

    a. In the lesson, you have identified the different types of
MEPDIS panels that are available. MEPDIS also has a wiring
harness set that was designed specifically for MEPDIS. These
wiring harnesses are durable and have connections that make
assembly easy.

    b. Using the power distribution panels and the field wiring
harness set, installing becomes an easy process. The wiring
harness set was designed to supply the electrical requirements
for various billeting tents. It was also designed to provide
electrical power distribution and illumination through receptacle
circuits and power outlets. This wiring harness set is
weatherproof and it contains various cables such as switches,
receptacles and extensions.

   c. To install the MEPDIS system, you simply connect the
designated cables to the required power distribution panels and
the wiring harness set. Ensuring that the load requirements are
met, all that is needed is to install the power distribution
panels in the required areas.

    d. Field Wiring Harness (FWH), The FWH set was designed to
supply all electrical requirements for one maintenance tent, two
command post tents, and ten medium general purpose tents. The
entire set is packed in 13 duffel bags and comes with four boxes
of light bulbs. Each bag contains enough wiring to supply one
tent with proper lighting.




                              SO 8
ITEM            CABLE      PRINCIPAL   # CABLES/      #          #      CABLES
            NOMENCLATURE   DIMENSION      BAGS     CABLES/   CABLES/   FWH SET
                                           GP      BAGS CP     BAGS
                                                              MAINT

CABLE   1   LEAD-IN        15 FT.         1          1         -         12
CABLE   2   EXTENSION      25 FT.         1          -         -         10
CABLE   3   EXTENSION      8 FT.          1          1         -         12
CABLE   4   WYE            2 FT.          1          -         2         12
CABLE   5   SWITCH         6 FT.          1          1         2         14
CABLE   6   LIGHT          8 FT.          3          2         6         40
CABLE   7   RECEPTACLE     8 FT.          1          1         6         18

CABLE 8     GENERATOR      20 FT.         1          1         1         13
            LEAD-IN
CABLE 9     COMMERCIAL     4 FT.          1          1         1         13
            POWER
            JUMPER
CABLE       ARMY SYSTEM    4 FT.          1          1         1         13
10          CONVERSION




                                       SO 9
REFERENCE:                                   REFERENCE#

Components List for Field Wiring Harness,    SL-3-09049A
Model MLK-0000 (Jan 92)

Components List for Mobile Electric Power    SL-3-6110
Distribution System Replacement (MEPDIS-R)

Components List for Power Distribution       SL-3-09124A/09125A/
System, Models PD-100, PD-030, and PD-015    09127A

Environmental Considerations in Military     MCRP 4-11B
Operations (Jun 00)

Operation and Maintenance Including          TM 09049A-12&P/1
Components List and Repair Parts List for
Field Wiring Harness, Model MLK-0000, for
Mobile Electrical Power Distribution
System (MEPDIS)

Operation and Maintenance for the Power      TM 09124A 09125A
Distribution System (PDIS), Models              09127A-14/1
PD-100, PD-030, & PD-015

Operation/Maintenance Manual with Repair     TM 6110-OI/1
Parts List for Mobile Electric Power
Distribution System Replacement
(MEPDIS-R)

Theater of Operations Electrical Systems     FM 5-424
(Jun 97)

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                              SO 10

				
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