15.8.4 Hazardous Area Requirements. Hazardous area requirements only apply
where flammable and combustible fuels, e.g., gasoline, natural gas, or
propane, are used to supply engine-generator units. Properly ventilated
battery rooms do not require hazardous area treatment.
interference requirements (EMI) for engine generators are addressed in
MIL-STD-461, Electromagnetic Emission and Susceptibility Requirements for
emission and susceptibility requirements apply only to units supplying power
to or used in critical areas. The requirements are mandatory only for
smaller engine-generator unit sizes. Contact the command or the agency
concerned to determine if electromagnetic control is needed. Emission and
radiation susceptibility protection should be a requirement of the
engine-generator manufacturer; such protection should not be provided by
generator building shielding. EMI protection is standardly provided for
for electric-generating plants are covered in DM-4.06, Lightning and
15.8.7 Energy Conservation. A minimum power factor of 0.85 is required.
Where a power factor of 0.85 cannot be met by the use of energy-efficient
motors, power factor correction must be provided by other means.
15.8.8 Controls and Alarm Systems. Electric power for engine and generator
control and alarm systems should be supplied from the station battery. The
starting system battery should not be used for this purpose. When the size
of the engine-generator plant does not warrant a station battery, consider
providing a battery backup system to allow safe plant shutdown during a
commercial power outage.
systems (EMCS) are addressed in NAVFAC DM-4.09, Energy Monitoring and
a) NFGS-13947, Energy Monitoring and Control System (EMCS), Large
b) NFGS-13948, Energy Monitoring and Control System (EMCS),
Medium System Configuration.
c) NFGS-13949, Energy Monitoring and Control System (EMCS),
Small System Configuration.
d) NFGS-13950, Energy Monitoring and Control System (EMCS),
Micro System Configuration.