CHAPTER 9.
ELECTRICAL SYSTEMS
Section 1.
PRELIMINARY DATA
1.
SCOPE. This chapter provides guidance for the design of electrical
systems and selection of electrical equipment in hyperbaric facilities.
Electrical energy is a potential hazard in an oxygen-enriched environment
because it is the chief source of ignition of flammable materials. Ideally,
all flammable materials and electrical energy should be eliminated from the
hyperbaric environment; practically, complete elimination is not possible.
Therefore, this chapter is devoted to safe use of electrical energy inside
the hyperbaric chambers and outside the hyperbaric chambers.
2.
RELATED CRITERIA. For criteria related to electrical systems in the
Design Manual series, see the following sources (References (1), (2), and
(3)):
DM-4 Electrical Engineering
DM-8 Fire Protection Engineering
DM-12 Electronic Facilities Engineering
3.
POLICIES.
a.
DOD Policies. See Department of Defense, Construction Criteria
Manual, DOD 4270.1-M (see Reference (4)).
b.
Local Codes. Although the Federal Government is not required to
conform to city or district building codes for property within Federal
Government ownership lines, local codes should be considered. The design and
installation of interior lighting, electric power facilities, and roadway
lighting systems should conform, as far as practicable, with adjoining
community regulations and standards.
c.
National Codes. NFPA 70 (see Reference (5)), the National
Electrical Code (NEC) and ANSI C-2 (see Reference (6)), the National
Electrical Safety Code (NESC) establish minimum standards of design and
installation practices, and their recommendations must be followed.
Electrical materials and equipment should conform to the standards of the
Underwriters' Laboratories, Inc., or other recognized testing agencies or
laboratories.
d.
Design Analysis. The design analysis covering electrical systems
shall be made in accordance with good design procedures based on the con-
servation of energy and shall show all calculations used in determining capa-
cities of such systems. Methods and tabulations used in sizing conductors,
conduit, protective devices, and other equipment needed to complete a system,
which require other than routine methods, shall be included. All
calculations shall be clearly shown so that any changes that become necessary
due to revisions during construction can be made efficiently. When tables
used in the design are taken from publications, the title, source, and date
of the publication shall be plainly indicated. The model number and
manufacturer of each
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