MIL-PRF-52109H
within five minutes and develop full power within 15 minutes at all temperatures specified
herein. The engine shall deliver power at its continuous duty rating to meet the pump
performance requirements of 3.3.2.
3.3.5.2 Electric motor. The Type II, Size 1, Class 1 (EMD) pumping assembly shall be
provided with an electric motor of 208 volts-alternating-current (VAC), 60 hertz, 3 phase,
4-wire, NEMA MG 1, Design B. A 220 VAC, 60 cycle, single phase, 3-wire design will be
acceptable at the discretion of the contracting officer (see 6.2). The motor shall have a
continuous duty power rating sufficient to meet the pump performance requirements of 3.3.2.
The motor shall be a squirrel-cage, solid-shaft, induction type; totally enclosed, fan cooled, and
horizontally mounted. All electrical connections shall be watertight. A heavy duty power cord,
10 feet minimum, with a plug in accordance with Figure 1 shall be provided. A means to store
the power cord shall be provided.
3.3.5.3 Grounding assembly, Type I. Type I pumping assemblies shall be provided with
a ground terminal, ground rod, and ground wire. The Type I pumping assembly shall provide
complete electrical continuity throughout the unit, and shall include a metal-to-metal contact
from the pump to the ground. This includes all electrically conductive components of the unit
that the operator may come in contact with. All bonding and/or grounding connections shall be
mechanically secure and shall measure 1 (one) ohm or less. Ground rod and grounding wire
equipped with manual clamps requiring no tools shall be provided for grounding the pump
during operation. The grounding rod shall include an integral hammer and anvil, of sufficient
size to drive the rod into compact soil. The grounding rod, which may be collapsible, shall fit in
the dimensional envelope and shall be of sufficient total length to provide a minimum of
30 inches of ground penetration when in operational service configuration. Grounding wire shall
be provided on manual retracting reel mounted on the pump assembly. Grounding wire shall be
a minimum of 6 feet in length. The pump assembly shall include stowage/storage provisions for
all grounding equipment.
3.4 Interface requirements.
3.4.1 Size 1 connections. Suction and discharge connections shall face opposite sides
(180 degrees apart) of the pumping assembly, with both in the horizontal position; except the
Class 1 (EMD) that shall have both connections facing the same side, with both in the horizontal
position.
a. Suction connection shall be 1.50-inch, female, quick-disconnect couplings and gaskets
IAW A-A-59326, Class A, fitted with tethered dust plugs IAW A-A-59326/11, Class A.
b. Discharge connection shall be 1.50-inch, male, quick-disconnect couplings IAW
A-A-59326, Class A, fitted with tethered dust caps and gaskets IAW A-A-59326/10,
Class A.
3.4.2 Size 2 connections. Suction and discharge connections shall face opposite sides
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