Chapter 11 Utilities

Question 1

Define voltage

Answer 1

Force(pressure) that move electrons along a conductor

Question 2

How many volts are expected for the following:

Extremely High
High Voltage
Low Voltage

Answer 2

Extremely high - 60,000 or greater

High Voltage - 600-59,999

Low Voltage - below 600

Question 3

How many volts can a transmission line carry?

Answer 3

345K

Question 4

How is current defined?

Answer 4

Amount or rate of electricity flowing through a conductor

Question 5

How is current measured?

Answer 5

Amps

Question 6

How is resistance defined and how is it measured?

Answer 6

opposition to the electrical current, measured in Ohms

Question 7

According to OSHA, how deaths are caused by electricity?

Answer 7

over 700 per year in the US. Makes up 12% of worker deaths in the US annually.

Question 8

Define touch potential

Answer 8

When an individual or object comes into contact with a live source or conductor

Question 9

Define step potential

Answer 9

wire or source energizes the ground, like water ripples away from the source

Question 10

How should you position your rig from a utility pole fire?

Answer 10

2 spans or 50’

Question 11

What percentage of methane is commercial grade natural gas?

Answer 11

93%

Question 12

What is the flammable range for natural gas?

Answer 12

4-15%

Question 13

What is the ignition temperature or point for natural gas?

Answer 13

990-1100

Question 14

What are the size of pipes that carry natural gas?

Answer 14

20-42 inches

Question 15

What are the PSI ranges for natural gas supply lines?

Answer 15

200-1500 PSI

Question 16

How long can it take for the natural gas to stop flowing from a transmission line?

Answer 16

2-3 hours or sometimes longer

Question 17

For gas safety what psi ranges make up high pressure, intermediate pressure and low pressure?

Answer 17

High Pressure or HP - above 300 PSI
Intermediate or IP - 2-300 but usually 45-60 PSI
Low Pressure or LP - .25 PSI