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| MIL-F-14252 ( AR )
3.2.13 Safety of personnel.
3.2.13.1 Mechanic al.- Suitable protection shall be provided to
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prevent accid ent al contact by personnel with moving mechanical
when the equipment Is
parts such as gears, fans, and belts
complete and In the operating position. Sharp projections on
cabinets, doors, and similar parts shall be avoided.
al.- Satisfactory provision shall be made to
3.2.13.2 Electric
prevent personnel from accidentally coming in contact with volt-
ages in excess of 50 volts (RXS) to ground, chassis, or frame.
This requirement shall be interpreted to require also protection
to personnel against capacitor discharge. When doors, plates,
and covers are opened or removed for maintenance and rePairs
protection from voltage in excess of 500 volts shall be provided
by interlock switches. Where interlock switches are used, man-
ually operated by-pass switches shall be Installed which will
automatically open when the door plate or cover is closed.
Where voltages of 500 or more volts nominal Value are exposed
when an access door or cover is removed, a label (see 3.12.3.2) W
shall be conspicuously displayed which reads `DANGER-HIGH VOLTAGE
in white or aluminum letters at least 3/8 Inch high, on a red
background.
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3.2.13 .2.1 Ground potential. -The construction of the equipment
all external parts, exclusive of antenna and
shall be such that
transmission lines, shall be at ground potential at all times
(see 3.11.14.12). No line of the primary power source shall be
electrically connected to the case of any fire-ccntrol instru-
ment.
3.2.14 Ease of operation. - Operating controls shall be conven-
iently located and where required by tactical consideration
shall be capable of being operated by personnel wearing stand-
ard arctic clothing.
3.2.15 Ease of adjustment and maintenance of electrical equip-
ment.- Test points or Jacks shall be convenien tl.Y Located where
necessary to provide proper operating adjustment and maintenance.
Indicating devices such as lamps and meters shall be installed
where required. The equipmcnt shall be so constructed that parts,
and wiring. will be accessible for circuit checking,
terminals,
adjustment, maintenance, repair, and replacement. with minimum
disturbance to other parts and wiring and with use of the mini-
mum number and variety of special tools, particularly these need-
ed for tuning and adjustment. Tools required for operational
adjustments shall be provided with the equipment and stored by
convenient means near the component where they are to be used.
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