Electricity

Question 1

What is electricity

Answer 1

A form of energy commonly used to power and illuminate

Question 2

What are the two types of current

Answer 2

Alternating

Direct

Question 3

What are the two different ways voltage can be classified

Answer 3

Low 50-1000

High 1000V AC+

Question 4

What are the possible risks to firefighters (6)

Answer 4

Directly touching a live conductor.
Indirect contact with a conductor.
Equipment - ladders.
Use of incorrect media.
Ionisation of smoke conducting electricity.
Being too close to high voltages and the arcing.

Question 5

What protection do electrical gloves afford

Answer 5

Up to 3300V

Question 6

What is the normal distribution path of electricity starting at a power station

Answer 6

Power station - sub station - supply sub station - primary sub station - everywhere else

Question 7

What are the types of incidents crews are likely to attend (2)

Answer 7

Electricity authority premises - buildings/enclosures.

Electricity authority equipment - in/adjacent/or under streets or pavements.

Question 8

What voltage of electricity can be found at electricity authority premises.

Answer 8

6,600 - 400,000V

Question 9

What’s the normal incident procedure (5)

Answer 9

Cordon off immediate area.
Don’t climb pylons.
Don’t use ladders in close proximity.
Don’t deal with incident until confirmed power off by authority.
Surrounding risks should be covered with appropriate media.

Question 10

What voltage can be expected at domestic and commercial premises.

Answer 10

Domestic 240V

Commercial 415V 3 phase supply.