Cordons, Distances and Numbers

Question 1

If there is a risk of IEDs what are the limits on radio communications?

Answer 1

Hand held radios - 10m

Appliance based radio - 50m

Question 2

What are the cordon distances when dealing with a suspected IED?

Answer 2

(a) Up to suitcase size, more than 100m.
(b) Car/light vehicle, more than 200m.
(c) HGV/lorry, more than 400m*.
* Note: If any doubt exists on size, 400m should be the minimum distance.

Question 3

At what temperature do Steel and Aluminium Cylinders generally fail?

Answer 3

Aluminium - 200-250C

Steel 300C

Question 4

What is the initial cordon for cylinder incidents?

Answer 4

200m

Question 5

At a substation within a building, what is the minimum fire protection time?

Answer 5

4 Hours

Question 6

What is the maximum attendance time for authorised personnel at incidents involving electricity?

Answer 6

2 Hours

Question 7

What are the minimum distances crews can work from over head power cables?

Answer 7

5m - to affect a rescue
10m - when using a ladder or aerial appliance (20m training)
10m corridor - when approaching dense smoke or flames
20m - when using hand held jets
30m - when using ground or aerial monitors

Question 8

What is the cordon size for a wind turbine?

Answer 8

300m

Question 9

What is the maximum voltage for electrical gloves for a rescue?

Answer 9

3300V

Question 10

What are the Current limits of both High and Low Voltage cables?

Answer 10

High - Above 1000v(ac)1500v(dc) Low - Below 1000v(ac)1500v(dc)

Question 11

What are the hazardous distances of fireworks?

Answer 11

Propelled upto 100m

Explosion upto 100m Diameter

Question 12

At what distance can Explosives with radio detonators be activated?

Answer 12

60m radio exclusion zone - Normal

600m radio exclusion zone - Military Grade

Question 13

What are the Cordon Distances for IEDs?

Answer 13

200m - explosives upto 250kg (small car)
600m - explosives 251kg - 2000kg and any military grade munitions
1000m - explosives over 2000kg

Question 14

What are the maximum legal explosive storage limits?

Answer 14

250kg - Fireworks

20kg - Black powder

Question 15

What are the Bar pressures for a Gas Distribution Network? ( High pressure/Medium/Low)

Answer 15

85 Bar - High - NTS
25 Bar - Medium - LDZ
1 Bar - Low - Domestic

Question 16

What are the Cordons for Gas leaks?

Answer 16

• 25 metres for public safety at a domestic
natural gas leak;

• 200 metres from a ruptured high/medium
pressure pipeline or building filled with natural gas;

• 600 metres from ruptured high/medium
where the gas jet is directed through a congested region;

• 1000 metres from a mass release of bulk storage of natural gas;

Question 17

What is the minimum cordon for a Hazmat including C0 leak?

Answer 17

25m

Question 18

Height required for a Dry Riser?

Answer 18

18m (DRY)

Question 19

Height required for a Wet Riser

Answer 19

50m (WET) 60m pre 2006

Question 20

What are the water requirements for Dry and Wet Risers?

Answer 20

DRY RISER - 1500lpm

WET RISER - 1500lpm for a minimum of 45 min

Question 21

What is the minimum recommended load for a firefighter lift?

Answer 21

850kg

Question 22

What are the recommended pressures of Wet risers?

Answer 22

4-5 Bar pre 2006

8 Bar post 2006

Question 23

What is the height requirement for a residential High Rise to have Sprinklers?

Answer 23

30m after 2006

Question 24

What are the inner circle and outer circle cordons at an RTC?

Answer 24

2m - Inner cordon

5m - outside the inner cordon