TM
5-811-1/AFJMAN
32-1080
ELEVATION
PLAN
Note:
For grounding see figure 9-3.
US ARMY Corps of Engineers
Figure 8-5. Secondary Unit Substation Transformer Installation.
turing, Processing, Distribution in Commerce, and
to meet the criteria contained in chapter 4, as
applicable.
Use Prohibitions."
a. Mineral oil. Mineral oil transformers will be
8-4. Transformer Dielectrics.
used for outdoor installations only. Mineral oil is
In addition to the guidance listed below, the
the preferred dielectric for outdoor installations.
b. Less-flammable liquid. Less-flammable liquid
dielectric system will be selected based upon cost,
transformers may be used either outdoors or in-
the transformer's location within the building, the
doors, and will be installed in accordance with
available space (liquid-filled units tend to have
MIL-HDBK-1008A. Acceptable less-flammable
larger front-to-back dimensions, due to their radia-
liquids are limited to high-molecular-weight hydro-
tors, than dry-type units), and the HVAC system
c a r b o n s and dimethyl silicone. Where less-
in the room (dry type units tend to have higher
flammable liquid transformers are proposed, a cost
losses than liquid-filled units). All dielectrics speci-
analysis will be provided which covers the accept-
tied must meet the requirements of 40 CFR Part
able alternatives and indicates that the most cost
761; "Polychlorinated Biphenyls (PCBs), Manufac-
8-7
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