Electricity Flashcards
Sub station with in premises have walls and floors separating it from the building and these have how much fire protection?
Four hours
These should be located on an outer wall
What is the concern if pvc insulation is involved in a fire?
It may give off large amounts of toxic fumes contain hydrogen - chloride gas
PCB’s polychlorinated biphenyls used for what? And are a concern because of what?
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
Sulphur hexafluoride SF6 are what?
Used as a insulating gas. Heavier than air. Can cause asphyxiation so ba must be worn.
The IC on arrival must locate the… ?
Responsible or authorised person to formulate a firefighting/rescue plan.
At wind turbines what should you ask for in addition to isolating the power? And what should be the initial cordon?
That blades are locked out and a 300m cordon
What additionally should be considered with explosions in pavement covers
Other covers exploding in the area.
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
True
Assistance message from national grid pylons and energy operators premises should include what?
Unique marking/identification plates
Electricity
What could be the attendance time of an authorised person
2 hours
Whilst waiting for the attendance of the authorised person, crews should focus on what?
Protecting the surrounding RISKS
What extinguishing media do not damage electrical equipment?
Carbon dioxide or vaporising liquids
When working closely to electrical equipment, who should be appointed?
Safety officers
Electrical gloves can be used on apparatus with less than?
If know less than 3300v
If wet this may be reduced
At what height is high voltage seldom located below?
2.5m above ground and protective are used when this can not be achieved
Low voltage is classed as what?
High voltage is classed as what?
Low below 1000v ac (1500 dc)
High above 1000v
Minimum safe approach distances at:
Overhead line, substations or other
No hose - ladders or aerials or tall equipment
Substations / overhead lines / other electrical supply 5m
Ladders/aerials 10m and 20m training
Distances in dense smoke or flames approaching conductors?
10m corridors
Using hose in electrical incident
When using hand held jet?
When using a monitor (ground or aerial)
Hand held jet 20m
Monitor 30m
On arrival if overhead cables and pylons are involved. Who should contacted?
National grid requesting urgent attendance of their authorised person
Every Electrical supply or distribution facility will display a?
a unique identifier located on a conspicuous indicator plate. and used stated when sending an informative message
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?
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.
At incidents involving explosions where by pavement covers are lifted. what should we do?
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
