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|  MIL-T-15108C(NAVY)
3.21 Spot welding or tack weldinq. Spot welding or tack welding shall not be used
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for structural parts subject stress or shock.
3.22 Liftinq means. Transformers of 10 kVA capacity and over shall be provided with
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means for lifting and handling by use of eye-bolts.
3.23 Windings.
3.23.1 Transformers shall have separate primary and secondary windings insulated from
each other and from metal parts.
3.23.2 Windings shall be supported so that mechanical stresses caused by short circuits
(see 4.6.13) and shock will not be reflected in the weakening of the insulation, permanent
deformation of the windings, or other mechanical or electrical injury.
3.23.3 Taps shall not be permitted.
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3.23.4 Magnet wire for transformers shall be in accordance with J-W-1177.
3.24 Core. Laminations shall be properly insulated from each other. In the assembly
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of the core, care shall be taken to remove all burrs or projecting laminations which might
result in injury to the coils. Laminations shall be clamped together in such a manner as to
insure a tight core. During the process of manufacture, the assembled core shall be given
a varnish dip. Laminations shall be annealed for stress relieving after punching or forming.
3.25 Identification plates.
3.25.1 General. Identification plates shall be as shown on figure 3 and in accordance
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with MIL-P-15024 and MIL-P-15024/5. Plates shall be installed on and furnished as a part of
each transformer and shall be located so that they can be easily read at all times without
danger to personnel. Unless otherwise specified in the contract or order, the identification
plates shall be located on the front of the enclosure.
3.25.2 Data on identification plates. The minimum data to be marked on the identification
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plates for transformers shall be as shown on figure 3.
3.25.3 Connection diagram plate. Connection diagram, schematically showing the actual
connections for three-phase operation, instructions for connecting in open delta and the
percent kVA capacity for open delta to be provided as shown on figure 3.
3.26 Connections and terminals.
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3.26.1 Ship's cable supports shall not be furnished. However, for sizes larger than
50 kVA, a removable angle iron ship's cable support bracket extending horizontally across
the cable compartment, shall be furnished. This bracket shall act as a base on which the
installing activity may mount, if desired, for the particular installation, a ship's cable
support. The top of the bracket shall be 2 inches wide and 2 inches above the core and
coils, whichever is highest.
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3.26.2 Terminal boards shall not be used. Transformer leads shall be secured by the
use of an insulated support and arranged in such a manner that the connections to ship's
cables may be made by the use of solderless connectors conforming to MIL-E-16366. Solderless
connectors need not be furnished with the transformer.
3.27 Cable compartments.
Location of cable compartments with respect to transformer kVA rating
3.27.1 Location.
shall be as follows:
(a) 1 through 10 kVA - cable compartment at bottom.
(b) 15 kVA and larger - cable compartment at top.
3.27.2 The minimum thickness of cable compartment removable side plates with respect
to transformer kVA size shall be as follows:
(a) 1 through 25 kVA - U.S. gage 16 (0.0598 inch).
(b) 37-1/2 kVA and larger - U.S. gage 15 (0.0747 inch).
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