ii. Terminology and Outside Environmental Conditions

IP65 Degree of Protection

Dust-tight: No ingress of dust. Protected against water jets: Water projected in jets against the enclosure from any direction shall have no harmful effects.

IP67 Degree of Protection

Dust-tight: No ingress of dust. Protected against the effects of temporary immersion in water: Ingress of water in quantities causing harmful effects shall not be possible when the enclosure is immersed in water.

Exposed to Outside Environment

Any electronic component, part, wire, cable, or related device that is physically located outside the cab of a vehicle is potentially exposed to all outside environmental conditions.

Outside Environmental Conditions

Common outside environmental conditions for the State of California:

A	Elevation from sea level, in feet	-300 to +10,000
B	Wind speed, any direction	0 to 100 mph
C	Temperature, summer (outdoor air temperature) (Ground surface can attain temperatures of 30°to 60° F higher than that of the free air).	85° to 110° F
	Temperature winter (outdoor air temperature)	-2° to 21° F
D	Solar radiation, summer	0 to 1,120 W/m²
	Solar radiation, winter	Negligible
E	Relative humidity, summer	44% to 14%
	Relative humidity, winter	100%
F	Condensation will occur on equipment due to temperature changes
G	Rain, hail, snow, ice loading
H	Dust, sand, gravel
I	Coastal region corrosive fog and sea spray
J	Steam cleaning, pressure washing

Environmental Stress Generation Mechanisms

Induced environmental stress generation mechanisms include:

• Road shock (large bumps / pot holes)
• Road vibration (random)
• Handling shock (dropping / overturning)