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LFF Reading List 2020 > Incidents involving electricity PN796 > Flashcards

Incidents involving electricity PN796 Flashcards

1
Q

the minimum safe approaching distance when using monitors (ground or aerial) is?

A

30m corridor

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2
Q

once Wind Turbine power isolation has been requested and blades “locked off”, does that remove residual electrical charge?

A

no - locking blades does not remove elec. risk

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3
Q

ICs must consider the effect of isolating power supplies in which three types of premises?

A

a) where there are machine processes
b) the absence of electrical supplies will affect occupants safety or welfare
c) there may be an adverse impact on business continuity

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4
Q

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?

A

5m

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5
Q

when can electrical gloves be used?

A

when voltage is known to be less than 3300v

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6
Q

what is the initial cordon for a turbine incident

A

300m

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7
Q

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

A

30m

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8
Q

Electrical hazards in a fire situation

4 listed

A

Large quantities of fuel may be stored (within power stations)

Oil filled transformers

Insulating materials

Gearbox oil

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9
Q

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

A

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

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10
Q

the minimum safe approaching distance in dense smoke or flames for approaching the conductor is?

A

20 corridor

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11
Q

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

A

300m

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12
Q

what two things will an electrical premises (or equipment concerned with generation & supply of electricity) have to restrict access?

A
  1. secure doors to switch rooms etc

2. fencing around installations

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13
Q

minimum safe distance when using ground monitor on overhead cables

A

30m

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14
Q

which firefighting media does not damage electrical equipment?

A

CO2

vapourising liquids

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15
Q

the minimum safe approaching distance for rescues is?

A

5m

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16
Q

On arrival to incidents involving electricity actions (general)?

A

locate responsible person

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17
Q

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

A

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

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18
Q

LFB gloves offer protection up to what voltage?

A

3300v

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19
Q

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

A

10m (20m in training)

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20
Q

Insulating materials at incidents involving electricty?

3 listed

A

PVC - toxic smoke

PCB (Polychlorinated Biphenyls) - insulating liquid (not always labelled)

SF6 (Sulphur Hexafluride) - insulating gas

21
Q

when should pavement covers be lifted?

A

NEVER! unless authorised person has confirmed it has been discharged

22
Q

On arrival at overhead cables?

A

request urgent attendance of National Grid

23
Q

what is classed as low voltage?

A

less than 1000AC or 1500DC

24
Q

What is high voltage?

A

greater than 1000volts ac (or 1500volts DC)

25
Q

FFs should not place themselves in a “corridor” how far either side if a overhead power line?

A

10m

26
Q

Ops procedure for pavement level cable systems fires?

A

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

27
Q

What is low voltage?

A

less than 1000volts ac (or 1500 volts DC)

28
Q

What is UPS?

A

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

29
Q

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

A

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

30
Q

On arrival of Fire and Explosions in pavement level ducting

3 listed

A

immediate attendance of authorized person.

cordon

do not touch

31
Q

What will National Grid pylons and energy operators premises have?

A

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

32
Q

Can rescue be made from electrical apparatus?

A

supply must be shut down!

if the voltage is known to be 3300v or less LFB electrical gloves will provide adequate protection

33
Q

the minimum safe approaching distance for ladders or aerials without hose is?

A

10m (20 in training)

34
Q

Once current is switched of to high or low voltage installations is it rendered entirely safe?

A

No - residual charge of electricity may be present in apparatus

  • residual charge needs to be made safe by authorized person
35
Q

minimum safe distance - In dense smoke or flames approaching conductor

A

10m

36
Q

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

A

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

37
Q

On arrival of Wind Turbines?

A

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

38
Q

when can crews pass electrical warning signs or gain access into areas which have warning signs?

A

when authorised person is in attendance

39
Q

when the IC requests attendance of the authorised person, what else must be included in the message?

A

a) information from ID plates and signs

b) RVP or access restrictions as necessary

40
Q

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?

A

4hrs

41
Q

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

A

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

42
Q

ground and aerial appliance monitors should not be use within what distance of a live conductor?

A

30m

43
Q

at a premises where a substation has been provided within a building, the transformer chamber / sub station will be situated against an outer wall. How much fire resistance, within the walls and floors separating it from the rest of the building?

A

4 hours

44
Q

name the 5 specific hazards associated with electricity

A 
electric shock
fire
explosion
hazardous gases and liquids
trip hazards
45
Q

What will supply or distribution facility display?

A

a unique identifier on a conspicuous indicator plate

46
Q

On arrival at a Substation?

A

request urgent attendance of authorized person

47
Q

minimum safe distance when using hand held jets on overhead cables

A

20m

48
Q

what is classed at high voltage?

A

over 1000 AC or 1500 DC

LFF Reading List 2020 (35 decks)

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