1

Question 1

Major causes of electrical shock

Answer 1

Pre occupation
Ignorance
Over familiarity
Laziness
Physical hazards
Horseplay

Question 2

3 main steps to prevent electrical shock

Answer 2

Know the hazards

Maintain safety discipline

Develop habit of noticing potential dangers

Question 3

Basic causes of electrical shock

Answer 3

Equipment failure (non direct contact)

Human failure (direct contact)

Combination of equipment and human failure

Question 4

1mA effects

Answer 4

Involuntary reaction

Question 5

10mA effect

Answer 5

Prevent you releasing your hold

Question 6

20mA effect

Answer 6

Physical damage

Question 7

30mA effect

Answer 7

Can kill

Question 8

Damp surfaces will … the resistance

Answer 8

Lower

Question 9

What voltage is considered dangerous to work on

Answer 9

30V

Question 10

What voltage is considered safe to work on

Answer 10

24v or less

Question 11

1st and 2nd steps of shock procedure

Answer 11

1. Raise alarm
2. Isolate casualty from supply (switch off supply)

Question 12

If you cannot isolate a casualty from the power supply what should you do?
(Step 3 of Shock Procedure)

Answer 12

Stand on insulated material

Push casualty clear of contact using insulated material

Don’t touch casualty with bear hands as the body will conduct electricity

Question 13

Step 4 of Shock procedure
(Once casualty is isolated from power supply)

Answer 13

Check for a response
Shake shoulders

Question 14

What to do if there is no response from a casualty?

Answer 14

Shout for help
Open airways
Check breathing
If not breathing:
30 Chest compressions, 2 rescue breaths

Question 15

What is LOTO

Answer 15

Method of isolation for systems + equipment

Question 16

Reasons for isolating equipment using LOTO

Answer 16

Allows maintenance to proceed safely
Isolate defective equipment
Isolate where equipment is removed

Question 17

4 parts of LOTO

Answer 17

Index sheet
Safety certificate
Label
Display board

Question 18

3 parts of LOTO label

Answer 18

A B C

Question 19

LOTO ON Steps:

Answer 19

1. Obtain permission
2. Identify points of isolation
3. Inform end users
4. Complete index sheet
5. Full in safety certificate
6. Complete LOTO Labels
7. Attach part A to points of isolation
8. Part B on display board with Part C with fuses/keys

Question 20

Fuse removal:

Answer 20

With equipment turned OFF
A. Place ☞ in centre of fuse holder
B. With free hand unscrew fuse holder
C. Turn head away and remove holder
D. Remove fuse
E. Replace fuse holder

Question 21

LOTO OFF Steps:

Answer 21

1. Obtain permission
2. Full on safety certificate
3. Collect parts B + C
4. Remove part A, replace fuses
5. Return label to AP
6. Complete safety Certificate
7. Destroy labels
8. Close LOTO index