TB 8 - Electrical Hazards Flashcards
How many deaths per year?
700
What are AMPs?
Current flow (GPM)
* It’s what flows on a wire or conductor
What are Volts?
Electrical pressure or push measured in volts
OHMS
Watts = Amps x Volts
Amps = Watts / Volts
Volts = Watts / Amps
What is OHMS Law?
One OHM is the resistance value through which one volt will maintain a current of one AMPERE.
WATTs?
Power is the amount of current times the voltage level at a given point measured in wattage or watts
Extremely high voltage?
60,000 +
High voltage?
600 - 59,999 volts
- usually found in customer distribution system = primaries (typically 4,800 kv)
What’s considered Low voltage?
600 volts
Electricity to Fire Hydraulics?
Conductor =
Current=
Voltage=
Amperes =
OHMS =
Hose
Water
Pressure
GPM
FL
Generation facilities generate how many volts?
4,000 - 20,000 volts
What do switching stations do?
Considered a step up transformer and sends long distances sometimes over 1 million volts
The transmission system consist of two components?
Grid - layout of electrical distribution system
Transmission lines - carry electricity from gen stations
Transmission lines voltage ranges?
69kv - 1000kv
* Most of the transmission lines coming into LA are 230 kv
Insulators spacing range from __ft?
3 - 20 ft long
Underground transmission lines in most congested areas if the city range from ____kv?
138kv - 230 kv
LADWP has how many receiving stations?
21
RECEIVING STATION BREAK DOWN -
Receive voltages of 138kv to 500kv and step it down to 34.5kv ; which is known as sub-transmission.
There are 150 distributions stations that receive volts of 34.5 kv and step it down to 4.8 kv ( known as primary circuit)