Electricity Flashcards
A substation will be positioned against an outer wall how long will the building resist fire
Four hours standard fire resistance %%%%
Incidents involving smoke issuing from pavement What must you remember about inspection covers
Under no circumstances should crews seek to lift covers or further expose pavement level cables to extinguish fires.
Unless the authorized person has confirmed the power has been isolated
Irrespective of the voltage what security must all premises concerned with the generation of electricity supply have
Locked doors or fencing
Every supply or distribution facility will display what ?
Electricity
A unique identifier located on a conspicuous indicator plate
What can occur in the atmosphere when high voltage equipment comes into contact with heat and smoke
Ionization of the air and surrounding conduction may occur
After switching off the current to a high or low voltage installation such as cable transformer or switchgear what hazard may still be present in the apparatus
A residual charge that must be made safe by an authorized person
Battery acid are present in some wind turbines what hazard Can this present
Acid may cause burns.
Hydrogen may be generated during charging
What chemical can be produced when PVC insulation is involved in fire ?
Electricity
Hydrogen chloride gas
Sulfur hexafluoride SF6 is used as an insulation and interrupting medium within electrical apparatus what hazard Candace present
This gas is heavier than air and can act as an asphyxiant in low lying areas.
Hazardous breakdown of products may form gas or powder and contain contaminants
Consider HMEPO
On arrival attendance should be made to the main entrance the incident commander should locate who ?
Electricity incident
The responsible person were available
Who should be contacted on arrival at an incident involving overhead cables and pylons
The national grid.
Request urgent attendance of the authorized person
At a wind turbine site what must you confirm about the blades before taking any offensive action
The blades must be locked out
BA crews should never pass what ?
Electricity incident
Any warning sign or gain access into an area that has warning signs
What is the attendance time for the authorized person ?
Electricity incident
The authorize Person is available 24/7 they can take up to two hours to attend
Whilst waiting for the attendance of the authorized person what should crews focus their efforts on ?
Electricity incident
Protecting the surrounding risks
Before using ladders and Ariel appliances at external substations who should you seek advice from
The authorized person will let you know if it’s safe to do so
What is the distance that a ground Monitor or Ariel appliance monitor should not be used within ?
Electricity incident
30 m of the live conductor
If it is necessary to use ladders or arial appliances in close proximity to overhead power cables how many meters away should be equipment be
10 m incident %%%%
20m training
Incidents involving wind turbines will require a safety cordon of what size
A 300 m diameter cord is usually recommended as a start point
What voltage will LFB electrical gloves provide adequate protection
3300 volts
High voltage apparatus is seldom located less than how high above ground
2.5 m above ground
The term high voltage relates to volts over how much AC current and how much DC current
1000 V AC current.
1500 V DC current
What is the minimum safe approach distance when carrying out a rescue from electrical apparatus
5 m
%%%%%
When using hand held jets what is the minimum safe approach distance ?
Electricity incident
20 m
