Incidents Involving Electricity (PN 769) Flashcards
What are the 5 Electricity Company Premises listed in the note?
A) Power Stations B) Sub Stations C) Fenced Enclosures D) Distribution Cables/Equipment E) Wind turbines
** Where are substations Situated within a building? **
Against an external wall and in a room protected by 4 hour rated material
What can be found on every Electricity distributers facility?
A conspicuously placed identifier plate
What might smoke issuing from the pavement indicate?
Fire in Electrical Ducting
What 7 ways of electric shock delivery are listed in the note?
Touch, overload, application of water, conduction by water, residual charge, arcing, damaged equipment
What are the 5 main hazards listed in the note at incidents involving Electricity?
1) Electric Shock
2) Fire
3) Explosion
4) Hazardous Gases (asphyxiants used to protect electrical equipment) and Liquids
5) Trips
What 3 insulating materials are listed in the note?
1) PVC
2) PCBs
3) Sulphur Hexafluoride
Are PCBs solids or fluids and what does PCB stand for?
Polychlorinated Biphenyls and they are fluids which are highly toxic and not biodegradable contained in some transformers (normally labelled)
What does SF6 stand for?
Sulphur Hexafluoride
Is SF6 a powder or a gas?
A gas which is heavier than air but when it ‘breaks down’ in a reaction it may present as a powder that can contaminate
- What is the minimum safe approach distance when using ladders or Aerial Appliances at an incident involving electricity? *
10 meters (though this may increase if weather conditions are likely to cause cables to move)
- At an incident involving a Wind Turbine what 2 things should an IC request and get confirmed before offensive firefighting commences? *
1) That any power supply to the turbine is isolated
2) That the blades are locked out
What are the 3 ‘fire hazards’ associated with electrical incidents listed in the note?
1) Large quantities of fuel
2) Explosion of oil filled equipment
3) Toxic smoke from burning insulation
At incidents involving:
Overhead Cables
Substations
Pavement Level Ducting
What must the IC request?
National Grid Authorised Person
Can firefighters lift inspection covers to access pavement level ducting?
Not initially and only when the ‘Authorised Person’ has confirmed that the power has been isolated and there is no residual current
What should an IC establish once a live source of electricity has been identified?
An appropriate ‘Restricted Zone’
In establishing a ‘Hazard Zone’ for a Pavement Level Ducting Incident what 3 things should the IC take into account?
1) Other inspection covers that may become involved
2) Debris from Explosion
3) Affect on Adjacent Premises, Glass shop fronts etc
The theft of components such as earthing cables may create what hazard?
The electrification of other surfaces such as Gates and Fences