L Safety Flashcards
What are the three main causes of electric shock?
Equipment failure
Human failure
Combination of both
How do we tackle the accident?
Precaution
Physical hazards
Noticing potential danger
What happens to the body at different electrical currents?
1mA Involuntary reaction
10mA Hard to loosen grip
20mA Physical damage
30mA Potentially death
What voltage on board is considered safe?
24 vdc
What dangerous components are on HM ships?
Tantalum capacitor (Sulphuric Acid) Selenium Rectifier (Toxic Gas)
Biggest fire hazard within the galley?
Deep fat Fryer
What are the major causes of accidents?
Pre Occupation Complacency Ignorance Laziness Horse play Physical Hazards
What are the precautions when working on dead equipment?
- Isolate and carry out the correct LOTO procedure
- Prove that it is dead by using a GPTME
- Discharge any capacitors
- If needed put shorting straps on to stop the capacitors from recharging
Name the three types of hand over switches
- Normal/alternative
- Normal/emergency
- Normal/alternative/emergency
What is the resistance of the human body?
1000 Ohms/ 1k ohms
Where does each part of LOTO tags go?
A) On isolated equipment
B) On the LOTO board
C) On the fuse or key
Why are shorting straps fitted to capacitors during maintenance?
To prevent them from recharging
When is it considered safe to work on live electrical equipment?
When supervised by an ME senior rate
Reasons for isolating supplies using the LOTO system?
- Maintenance
- Isolation
- Prevention from using equipment
- Waiting for equipment to arrive whilst supplies are fitted
- The kit is waiting to be removed
What are the three radioactive valves?
Class one radioactive valve
Class Two radioactive valve
Hazard radioactive valve
