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Flashcards in Incidents involving electricity PN796 Deck (29)
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1

Rescues - When carrying out a rescue in the vicinity of overhead lines, substations and other electrical equipment belonging to the electricity supply industry what is the minimum safe approach distance

5m

2

minimum safe distance on overhead cables - using ladders/aerial appliances

10m (20m in training)

3

minimum safe distance - In dense smoke or flames approaching conductor

10m

4

minimum safe distance when using hand held jets on overhead cables

20m

5

minimum safe distance when using ground monitor on overhead cables

30m

6

At premises where a sub station has been provided within a building the transformer chamber/sub station will be situated against an outer wall. The wall and floors separating it from the remainder of the building will have at lease how many hours standard of fire resistance?

4hrs

7

What will supply or distribution facility display?

a unique identifier on a conspicuous indicator plate

8

Can crews lift covers to further expose a pavement level cable system to extinguish fire

No - unless the authorized person has confirmed that power has been isolated and residual current has been discharged

9

Once current is switched of to high or low voltage installations is it render safe

No - residual charge of electricity may be present in apparatus - residual charge needs to be made safe by authorized person

10

Electrical hazards in a fire situation

Large quantities of fuelmay be stored (within power stations)
Oil filled transformers
Insulating materials
Gearbox oil

11

Insulating materials at incidents involving electricty?

PVC - toxic smoke
PCB (Polychlorinated Biphenyls) - insulating liquid (not always labelled)
SF6 (Sulphur Hexafluride) - insulating gas

12

On arrival to incidents involving electricity actions (general)?

locate responsible person

13

On arrival at overhead cables?

request urgent attendance of National Grid

14

On arrival at a Substation?

request urgent attendance of authorized person

15

On arrival of Fire and Explosions in pavement level ducting

immediate attendance of authorized person. cordon & do not touch

16

On arrival of Wind Turbines?

request isolation of any power supplies to the wind turbine and confirm that the blades have been "locked out"

17

Ops procedure for pavement level cable systems fires?

Under no circumstances should crews seek to lift covers or further expose a pavement level cable system to extinguish the fire unless the authorized person has confirmed power isolated and residual current discharged

18

What will National Grid pylons and energy operators premises have?

unique markings/ identification plates this information must be included in any message

19

If there is the possibility of high voltage present can f/f enter the risk area?

No - if any possibility at all no entry to risk area is to be made

20

If it is confirmed the residual electrical supply is of low voltage can action be taken?

Yes providing appropriate controls are put in place e.g electrical gloves

21

Ground and aerial appliances should not be used within how many meters from a live conductor?

30m

22

what is the distance (corridor) for firefighters and equipment when dealing with overhead power lines

10m either side of the overhead cable (measured along the ground)

23

what is the usual cordon recommended as a starting point for wind turbine fires?

300m

24

Can rescue be made from electrical apparatus?

supply must be shut down! if the voltage is known to be 3300v or less LFB electrical gloves will provide adequate protection

25

when can electrical gloves be used?

when voltage is known to be less than 3300v

26

A person is seen to be lying on top of a transformer, switch, or anywhere else above ground level can we attempt a rescue?

No - they must not be touched until word is received from an authorized person of electricity authority that it is safe for rescue work to be carried out

27

What is high voltage?

greater than 1000volts ac (or 1500volts DC)

28

What is low voltage?

less than 1000volts ac (or 1500 volts DC)

29

What is UPS?

UPS is a Uninterruptible Power Supply (e.g battery banks)