Electrical safe isolations and precautions

Question 1

5 precautions before any work is carried out on electrical equipment

Answer 1

risk assessment
permit to work
lock out tag out
prove dead
ppe
rubber matting
insluated tools
ventilation approved equipment
barriers
signage
comms

Question 2

3 causes of eletrical equipment failure

Answer 2

1. short circuit
2. earth fault
3. open circuit

Question 3

short circuit

Answer 3

double break in insulation, where two conductors create a path for a large current to flow

Question 4

earth fault

Answer 4

single break in insulation where a conductor touches the shops hull or an earthed metal enclosure

Question 5

open circuit

Answer 5

there is a break in the conductor so no current can flow

Question 6

2 types of batteries

Answer 6

1. lead acid

2. alkaline

Question 7

four battery applications Onboard ship

Answer 7

1. emergency lighting
2. life boat starter
3. emergency generator starter
4. fire detection system
5. Public address system

Question 8

maintenance required for batteries

Answer 8

clean cell tops
apply petroleum jelly to prevent corrosion
top up vented batteries with distilled water
inspect cables
voltage onload testing

Question 9

publication that deals with the storage of ships batteries

Answer 9

COSWP

Question 10

seven precautions working in an area where ships batteries are

Answer 10

risk assessment
permit to work
ventilation
no naked flames
barriers
communication
approved tools
approved testing equipment
ppe