TB 8 Flashcards
How many deaths per year?
700
What percentage of worker deaths does electrocution account for?
12 percent
What’s the expansion ratio of water to steam?
1 to 1700
How many cubic feet of vapor can 1 gallon of water produce when converted to steam?
227 cubic feet of vapor
How many BTUs does water absorb when changing to steam?
9330
How many BTUs does water use when raising temp from 62 to 212?
1250
What is the minimum safe distance for firefighters should maintain when operating hose streams near energized sources?
33 feet
What psi should be maintained when operating hose lines near energized sources?
100
What is the recommended minimum distance for spotting apparatus from downed wires?
At least 1 span, 2 undamaged poles for greatest margin of safety
What fog spray pattern do you use when operating around energized sources?
30 degree fog
What is the safe minimum distance to maintain from transmission towers?
35 feet
What is the safe clearance beyond outermost wire of electrical transmission lines?
100 feet
What is the weight of the typical man hole cover?
300 lbs
How far and high can a man hole cover travel in an explosion?
75 feet in the air
125 feet horizontally
What is the flash point of cooling oil in transformers?
300 degrees F
What is the explosive range of CO in percentages?
12.5 to 74 percent
What is the voltage range for high voltage cables that may be located close to the floor inside a conduit?
Up to 230,000 volts
What’s the maximum pressure inside a conduit containing high voltage cables?
200 PSI
How often are gauntlet gloves tested?
Every 60 days to 10,000 volts
What’s the minimum recommend safe distance for firefighters from downed power lines?
The span of two undamaged poles
How many volts does a small power drill use compared to the current it takes to cause death?
30 times the current it takes to cause death
How far should a vehicle be driven clear of downed wires for safety?
35 feet
For voltages 600 or more what is the minimum safe clearance for aerial ladders from power lines and electrical devices?
10 feet
What is the voltage range that classifies high voltage?
600-59,999
Primary distribution lines voltage?
4.8kv (4,800)
