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Flashcards in Electricity Deck (24)
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1
Q

A substation will be positioned against an outer wall how long will the building resist fire

A

Four hours standard fire resistance %%%%

2
Q

Incidents involving smoke issuing from pavement What must you remember about inspection covers

A

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

3
Q

Irrespective of the voltage what security must all premises concerned with the generation of electricity supply have

A

Locked doors or fencing

4
Q

Every supply or distribution facility will display what ?

Electricity

A

A unique identifier located on a conspicuous indicator plate

5
Q

What can occur in the atmosphere when high voltage equipment comes into contact with heat and smoke

A

Ionization of the air and surrounding conduction may occur

6
Q

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

A residual charge that must be made safe by an authorized person

7
Q

Battery acid are present in some wind turbines what hazard Can this present

A

Acid may cause burns.

Hydrogen may be generated during charging

8
Q

What chemical can be produced when PVC insulation is involved in fire ?
Electricity

A

Hydrogen chloride gas

9
Q

Sulfur hexafluoride SF6 is used as an insulation and interrupting medium within electrical apparatus what hazard Candace present

A

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

10
Q

On arrival attendance should be made to the main entrance the incident commander should locate who ?
Electricity incident

A

The responsible person were available

11
Q

Who should be contacted on arrival at an incident involving overhead cables and pylons

A

The national grid.

Request urgent attendance of the authorized person

12
Q

At a wind turbine site what must you confirm about the blades before taking any offensive action

A

The blades must be locked out

13
Q

BA crews should never pass what ?

Electricity incident

A

Any warning sign or gain access into an area that has warning signs

14
Q

What is the attendance time for the authorized person ?

Electricity incident

A

The authorize Person is available 24/7 they can take up to two hours to attend

15
Q

Whilst waiting for the attendance of the authorized person what should crews focus their efforts on ?
Electricity incident

A

Protecting the surrounding risks

16
Q

Before using ladders and Ariel appliances at external substations who should you seek advice from

A

The authorized person will let you know if it’s safe to do so

17
Q

What is the distance that a ground Monitor or Ariel appliance monitor should not be used within ?
Electricity incident

A

30 m of the live conductor

18
Q

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

A

10 m incident %%%%

20m training

19
Q

Incidents involving wind turbines will require a safety cordon of what size

A

A 300 m diameter cord is usually recommended as a start point

20
Q

What voltage will LFB electrical gloves provide adequate protection

A

3300 volts

21
Q

High voltage apparatus is seldom located less than how high above ground

A

2.5 m above ground

22
Q

The term high voltage relates to volts over how much AC current and how much DC current

A

1000 V AC current.

1500 V DC current

23
Q

What is the minimum safe approach distance when carrying out a rescue from electrical apparatus

A

5 m

%%%%%

24
Q

When using hand held jets what is the minimum safe approach distance ?
Electricity incident

A

20 m