Incidents involving Electricity PN769 Flashcards Preview

MMAC > Incidents involving Electricity PN769 > Flashcards

Flashcards in Incidents involving Electricity PN769 Deck (18)
Loading flashcards...
1

where would a sub-station be situated in a building?

On the outside wall

2

The walls and floor of the sub-station building have how long in relation to fire protection?

4 Hours

3

What is dangerous about smoke near electrical lines?

The air surrounding the cable can ionise, arching from cables to trees/buildings or brigade equipment

4

In a fire situation what are the hazards that could be present?

Large quantity of fuels present e.g. Methanol, Propane, Hydrogen, Methane, Chlorine and Oxygen

Oil filled transformers

Insulating materials creating vast quantities of toxic and irritant smoke

Some transformers are filled with carbon dioxide or vaporising liquid

5

Where should you make your arrival to?

Main entrance unless pre-planning determines a better entrance

6

What is the maximum attendance time for an authorised person?

2 hours

7

In case of fire and the responsible person is present but can not confirm if power is isolated without entering the compartment, what should be the actions of the IC?

IC must assess risk vs benefits

If any possibility remains as to whether high voltage remains, then no entry is to be made

If it can be identified as low voltage by responsible person then actions can be taken with suitable controls put in place

8

What is the idea of Carbon Dioxide or vaporising extinguishing media?

Neither damage electrical switch gear

9

What is the minimum distance a ground monitor or Aerial can be used on live switch gear?

30m

10

Unless otherwise marked, what power voltage will we assume battery banks to be and what can we use to protect ourselves?

LV
Electrical Gloves

11

If you see a person be seen laying on top of a transformer, switch or anywhere else above ground level, what should your actions be as IC

They must not be touched until the responsible person confirms it is safe for rescue work to be carried out

12

If high voltage apparatus is above ground what is the minimum height and what must be in place?

2.5m is the minimum height and then a protective screen must be placed around it

13

What voltage is deemed to be 'High Voltage'?

1000vAC or 1500vDC

14

What is the minimum safe approach distance of overhead lines or electrical substations to perform a rescue?

5m

15

What is the minimum safe approach distance for using a ladder or aerial (No hoses)

10m but 20m in training

16

What is the minimum safe approach distance in dense smoke or flames near a conductor?

10m

17

How close can you get whilst using a hand-held jet?

20m

18

How close can you get whilst using monitors (ground or aerial)?

30m

Decks in MMAC Class (43):