UFC 3 -520-01
June 10, 2002
plan and detail drawings. Apply Institute of Electrical and Electronic Engineers ( IEEE)
315, Graphic Symbols for Electrical and Electronics Diagrams, for symbols used in one -
line, three -line, riser, schematic, and wiring diagrams.
Compliance with this UFC is mandatory for the design of interior electrical
systems at all facilities and bases.
Facilities located outside of the United States must also comply with the
applicable host nation standards; refer to Technical Manual TM-5-688, Foreign
Voltages, for additional information. Different voltages, frequencies, and grounding
conventions often apply in other host nations; however, follow the design principles
provided in this manual to the extent practical.
MANUAL CONTENT AND ORGANIZATION .
This UFC establishes criteria for the design of interior electrical systems at all
facilities and bases. If adequate design guidance is provided by other manuals, this
UFC references these other sources, as applicable.
This UFC establishes system -level design criteria. In some cases, equipment
design and operation characteristics are specified to ensure that system-level
performance criteria are achieved. This manual is not an equipment specification
document; additional equipment specifications will still be necessary as part of any
procurement or construction activity. Refer to paragraph 2 -1.3 for information regarding
This UFC provides the starting point fo r determining the applicable design
criteria for a facility. Because of the broad scope of this manual, other industry and tri -
services documents are relied on as reference sources. As applicable for the particular
design activity, e nsure that the appropriate references from the list in Appendix A are
available. Throughout this manual, each chapter provides additional information
regarding which references offer the most benefit for specific topics.
This manual covers many subjects in detail. In most cases, each topic could
be an entire manual or series of manuals by itself. In order to keep this manual to a
manageable size, the focus has been on design standards that will be of most value to
the users. Other documents will still be necessary to assist the users with electrical
design issues. In particular, the IEEE Color Book Series are recommended; these IEEE
Recommended Practices provide background information that will assist in identifying
and resolving technical design issues.
This manual establishes facility-level criteria for interior electrical systems. In
most cases, a facility is a building or structure that has its own service entrance. This is
a broad definition that can be applied to a multi -story building or a single -level structure
or an aircraft shelter. To further complicate the definition of a facility, some backup