MIL-HDBK-1025/10
8.2.4.4 Caution and Danger Signs. The following are approved signs:
a. Danger, High Voltage -- Various sizes
b. Danger -- Keep Away -- 300 by 600 millimeters (12 by 24 inches)
c. Danger -- Personnel Working Overhead -- 300 by 350 millimeters (12 by 14 inches).
d. Wear Goggles When Grinding -- Various sizes
e. Danger, Drive Slowly -- Personnel Working -- 380 by 380 millimeters (15 by 15
inches).
f. Danger -- Blasting -- 380 by 380 millimeters (15 by 15 inches).
g. Caution -- Check for Feedback -- 140 by 50 millimeters (5.5 by 2 inches).
8.2.4.5 Manhole Work Areas
Note
Preparing a manhole work area requires proper use of warning devices.
a. During the time that manholes or vaults at the sidewalk or street level are open,
suitable barricades, traffic cones, warning signs, flags, and lights will be used and maintained.
b. When working in vehicular traffic areas manholes, traffic cones should be used to guide
traffic around the danger area. Great care should be exercised not to obstruct traffic. In addition,
a blinking light may be used on the traffic side of the hole, as well as sawhorse type barricades
around the hole.
c. For sidewalk manholes and vaults, the barricades should provide pedestrians and
onlookers positive protection against falling over material or into the manhole. At night all open
manholes should be outlined with either flashing or nonflashing lights.
8.2.4.6 Excavation, Trenching, and Backfilling. Comply with the requirements of
OSHA standard 29 CFR 1926, subpart P, Excavations. Work in increments to minimize open
trenches. On a daily basis, remove spoil to an area where it will not constitute a safety hazard.
a. All equipment and materials, stored where pedestrian or vehicular traffic might be
endangered, should be marked with red flags by day and red lights by night, or both. Do not store
equipment or materials where they will obstruct fire alarm boxes, hydrants, or fire apparatus.
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