Electricity

Question 1

Sub station with in premises have walls and floors separating it from the building and these have how much fire protection?

Answer 1

Four hours

These should be located on an outer wall

Question 2

What is the concern if pvc insulation is involved in a fire?

Answer 2

It may give off large amounts of toxic fumes contain hydrogen - chloride gas

Question 3

PCB’s polychlorinated biphenyls used for what? And are a concern because of what?

Answer 3

Used in some transformers and other electrical equipment as an insulating liquid and is highly toxic, harmful to the environment as they’re not biodegradable

Question 4

Sulphur hexafluoride SF6 are what?

Answer 4

Used as a insulating gas. Heavier than air. Can cause asphyxiation so ba must be worn.

Question 5

The IC on arrival must locate the… ?

Answer 5

Responsible or authorised person to formulate a firefighting/rescue plan.

Question 6

At wind turbines what should you ask for in addition to isolating the power? And what should be the initial cordon?

Answer 6

That blades are locked out and a 300m cordon

Question 7

What additionally should be considered with explosions in pavement covers

Answer 7

Other covers exploding in the area.

Question 8

Electricity

Crews must not pass warning signs or gain access into areas that have warning signs restricting access until the responsible or authorised person says so. True or false

Answer 8

True

Question 9

Assistance message from national grid pylons and energy operators premises should include what?

Answer 9

Unique marking/identification plates

Question 10

Electricity

What could be the attendance time of an authorised person

Answer 10

2 hours

Question 11

Whilst waiting for the attendance of the authorised person, crews should focus on what?

Answer 11

Protecting the surrounding RISKS

Question 12

What extinguishing media do not damage electrical equipment?

Answer 12

Carbon dioxide or vaporising liquids

Question 13

When working closely to electrical equipment, who should be appointed?

Answer 13

Safety officers

Question 14

Electrical gloves can be used on apparatus with less than?

Answer 14

If know less than 3300v

If wet this may be reduced

Question 15

At what height is high voltage seldom located below?

Answer 15

2.5m above ground and protective are used when this can not be achieved

Question 16

Low voltage is classed as what?

High voltage is classed as what?

Answer 16

Low below 1000v ac (1500 dc)

High above 1000v

Question 17

Minimum safe approach distances at:

Overhead line, substations or other

No hose - ladders or aerials or tall equipment

Answer 17

Substations / overhead lines / other electrical supply 5m

Ladders/aerials 10m and 20m training

Question 18

Distances in dense smoke or flames approaching conductors?

Answer 18

10m corridors

Question 19

Using hose in electrical incident

When using hand held jet?

When using a monitor (ground or aerial)

Answer 19

Hand held jet 20m

Monitor 30m

Question 20

On arrival if overhead cables and pylons are involved. Who should contacted?

Answer 20

National grid requesting urgent attendance of their authorised person

Question 21

Every Electrical supply or distribution facility will display a?

Answer 21

a unique identifier located on a conspicuous indicator plate. and used stated when sending an informative message

Question 22

Incidents involving smoke issuing from pavements or explosions in pavements can often involve pavement level electrical ducting. Incidents of this nature present a genuine hazard to crews. What should crews not do?

Answer 22

in
the past attending crews have been injured whilst removing inspection covers or in trying to
access ducting at the point an explosion has occurred. Under no circumstances should crews
seek to lift covers or further expose a pavement level cable system to extinguish the fire, unless
the authorised person has confirmed that power has been isolated and any residual current has
been discharged.

Question 23

At incidents involving explosions where by pavement covers are lifted. what should we do?

Answer 23

The high voltages and complexity in the nature of the various types of cable conveyed through these structures mean that once the Brigade is in attendance there is little that crews can do other
than mitigate the risk to passers-by from further over pressures and provide cover for nearby fire
risks. and make sure that that the releivent authority are informed/requested