MIL-DTL-16377J(SH)
3.6.13.3 Ground connection. Fixtures provided with a grounding conductor (green or red) in the supply cable
shall have the end of that conductor, terminating within the fixture, securely attached and electrically connected to
the metallic or conducting structure most likely to contact the body. This shall be accomplished in such a manner
that all exposed metallic or conducting parts shall make adequate electrical contact with the grounding conductor
when tested as specified in 4.8.11.
3.6.13.4 Continuity of grounding. Fixtures and parts provided with shock mounts or removable mounting
plates shall be not greater than 0.10 ohm impedance between protruding tip of shock mount/mounting plate and any
remote internal metallic structure of housing assembly when tested as specified in 4.8.12. Shock mounts and
mounting plates shall not be painted.
3.6.13.5 Portable fixtures. The leakage current (see 6.12.3) of the portable fixtures shall be not greater than
5 milliamperes. Leakage current shall be measured as specified in 4.8.13.
3.6.14 Electromagnetic interference (type I and type III only). Unless otherwise specified (see 6.2 and 6.10),
electromagnetic interference requirements for Type I and Type III fixtures shall conform to the requirements of
MIL-STD-461 when tested as specified in 4.8.16.
3.6.15 Dielectric withstanding voltage. There shall be no evidence of breakdown, arcing, corona (audible or
visible), or punctured insulation when the interior of the fixture or part is subjected to the test specified in 4.8.2.
3.6.16 Insulating resistance. The insulation resistance between all current-carrying and noncurrent-carrying
parts of fixtures or parts shall be not less than 1 megohm when tested as specified in 4.8.3.
3.6.17 Fail-safe circuit design for type III luminaires. Light emitting diode (LED) circuits utilizing more than
one LED shall be designed to ensure multiple open circuit or failed LEDs shall not diminish electrical energy to
other LEDs. This can be accomplished using bypass or alternative path circuits for series LEDs, or by adjustment of
the electrical energy supplied to remaining LEDs wired in parallel to the failed LED (see 4.8.24).
3.6.18 Power interface requirements. Unless otherwise specified (see 6.2), all fixtures shall be designed to
operate on Type I power as described in MIL-STD-1399-300 (see 4.8.21).
3.6.18.1 Total harmonic distortion for type I and type III fixtures. The MIL-STD-1399-300 exception for
equipment less than 1 KVA is not applicable to input current waveform total harmonic distortion unless the fixture
has less than 6 watts of input power (see 4.8.22).
3.6.18.2 Voltage transient spike for type I and type III fixtures. The minimum number of voltage spikes shall
be 520. The 250+250+20 total shall be derived from the mathematical addition of all positive and negative spikes
the luminaire was subject to during spike testing i.e., 250 spikes at the 90-degree trigger point, 250 spikes at the
270-degree trigger point, 20 spikes at the 0-degree trigger point (zero crossing) (see 4.8.23).
3.6.19 Class 2 emergency light fixtures. Class 2 emergency light fixtures shall utilize a battery to provide
useful light upon the loss of normal power. The battery back-up system shall include charging circuitry, an AC
sensing circuit, low battery voltage cut-off circuitry and thyristor devices for protection against high voltage spikes.
Upon loss of AC power, the system shall immediately switch to battery power. When AC power is restored, the
light shall return to its normal operating parameters and begin re-charging the battery as necessary.
3.6.19.1 Class 2 emergency light fixture output life. Emergency light fixtures shall provide usable light for a
minimum of 5 hours on a fully charged battery. Lumen output levels shall be as specified in 3.7.1.1.
3.6.19.2 Class 2 emergency light fixture battery. The battery for an emergency light fixture shall be a nickel
cadmium (NI-CAD) battery unless otherwise approved by NAVSEA.
3.6.19.3 Class 2 emergency light fixture charging system. The charging system for the emergency battery shall
take a maximum of 20 hours to fully charge the battery and shall draw no more than 4 watts of power during any
point of the re-charge cycle. The system shall have a power factor of greater than 0.95 and total harmonic distortion
of less than 3 percent (see 4.8.26).
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