5.1.3.6 EMCON requirements. Acoustic, electromagnetic
and optical emitters, such as radars and communications systems, shall have
provisions for emission control.
5.1.3.7 Demagnetic requirements for
minesweeper equipment. The equipment shall be in accordance with DOD-STD-2143.
Magnetic material tests shall be in accordance with MIL-I-17214.
5.1.3.8 Fungus. The equipment shall not support fungal growth. Fungus
tests shall be in accordance with MIL-STD-810, method 508.
5.1.3.9
Toxic hazards. The equipment shall not expose personnel to toxic substances in
excess of the threshold limit values in accordance with ACGIH ISBN
O-936-712-39-2.
5.1.3.10 Prohibited materials. The materials listed in
Table V, and 29 CFR 1910.1001 to 1910.1101, shall not be use. Additional
submarine atmosphere prohibited materials are specified in S9407-AB-ATM-010.
Waivers for the use of prohibited materials shall be granted in accordance
with current DOD acquisition directives. Waivers shall not be granted for the
use of radium and its daughter products (radioactive materials). Additional
material requirements for militarized equipment are specified in 5.1.7.8. The use of hazardous material
(see 4.7.2
) as defined in FED-STD-313
shall be approved by the contracting activity upon submission of justification
to prove that:
(a). There is no safer substitute to meet
specifications.
(b). The material is or is not recyclable.
(c).
Non-recyclable material may be safely disposed of in such a manner asto
minimize hazardous waste and the cost of alternative approaches is not
practical, including life-cycle cost for use and disposal of the hazardous
waste including employee training.
5.1.3.10.1 Flammability. Cable
flammability will meet the test requirements in accordance with MIL-C-17 and
MIL-C-24643. Flammability testing of other parts and materials shall be in
accordance with MIL-STD-454, requirement 3.
5.1.3.11 Safety. Safety
considerations shall be addressed. Guidance for the System Safety Engineering
program is provided in MIL-STD-882. Safety requirements shall be in accordance
with MIL-STD-454, requirement 1, Appendix E, UL-478 and as specified herein.
Waivers to safety requirements shall require the written approval of the
procuring activity. Waivers shall be granted only upon demonstration that the
equipment has been tested in accordance with the appropriate Underwriters
Laboratory (UL), Government, or other industry consensus tests to demonstrate
its safety for use in the shipboard environment.
5.1.3.11.1 Leakage
current. Equipment leakage current shall be limited to 5 milliamperes (mA or
rms). Leakage current shall be determined using a solidly grounded power
source. Equipment with EMI filters connected line-to-ground shall be balanced
to ensure that the leakage current in the equipment ground does not exceed 5
milliamperes (see 5.1.4.5).
Leakage current tests shall be as specified in Appendix F, or equivalent UL or
other industry consensus standard approved by the contracting activity. The
foregoing tests shall not be performed aboard ship, in that the potential of
the ship's electrical system "floating neutral" to the hull will be dependent
upon the operating modes of equipment, configuration of the electrical plant,
physical installation location of the equipment and so forth.
5.1.3.11.1.1 Isolation transformers. On equipment whose leakage
current would otherwise exceed 5 milliamperes rms, an isolation transformer
shall be applied. The isolation transformer shall be part of the equipment
configuration. User equipment loads shall be isolated from ac line voltages by
a dc resistance greater than 200 megohm kW of connected load.
5.1.3.11.2 Protective shields. Protective shields shall be provided to
protect personnel from accidental contact with parts in excess of 30 V rms or
30 Vdc.
5.1.3.11.3 Reference and signal voltages. Equipment utilizing
external reference or signal voltages in excess of 30 V rms or 30 Vdc shall
have the provision for interrupting the reference and signal voltages during
maintenance actions.
5.1.3.11.4 Safety, electrical power. Switches for
disconnecting equipment from electrical power systems shall break all power
and return conductors of the circuit. The safety ground shall not be
disconnected.
5.1.3.11.5 Safety ground, internal. A ground terminal
shall be provided on equipment. The ground terminal shall be located on the
power input connector or on the equipment terminal board and shall connect to
internal chassis by means of conductors at least equal in size to one of the
power input conductors. Safety grounding within the equipment shall terminate
on the ground terminal.
5.1.3.11.6 Safety ground, external. When power
is routed externally between individual units of an equipment, a ground
conductor shall be included with the power conductors and shall connect to the
ground terminal of individual units.
5.1.3.11.7 Safety ground, power
cable assemblies. In power cable assemblies that connect to convenience
outlets, a safety ground conductor shall be included in the assemblies. The
safety ground conductor shall be provided by utilizing three-pin connectors
and three-conductor cables. The green wire shall be connected to the grounding
blade or pin for the type connector used. Input power cable assemblies shall
conform to type I of MIL-C-28777.
5.1.3.11.8 Safety ground, drawers. A
safety ground shall be included with the power cable assembly and connector of
equipment drawers, such that disconnecting of the safety ground from the
drawer will result in disconnecting of the power assembly.
5.1.3.11.9
Equipment tests. Equipment when tested under conditions of maximum intended
load shall not attain a temperature at any location which constitutes a risk
of fire, damages any materials used in the equipment, or exceeds temperature
above the ambient as allowed by UL or other consensus standards for the
equipment.
5.1.3.11.10 Thermal design. Equipment handle or knob
temperatures shall not exceed those limits specified by MIL-STD-454,
requirement 1, UL, or other consensus standards for the type of equipment.
Other accessible surfaces on which temperatures may jeopardize operator safety
as specified by MIL-STD-454, UL or other consensus standards for
the type of equipment shall be labelled with a temperature hazard
warning.
