electric shocks Flashcards
What does DC stand for?
Direct current
What does AC stand for?
Alternating current
What is the AC and DC for ELV?
- AC - 0 to 50v
- DC - 0 to 120V
What are the voltage levels?
- Extra low-voltage (ELV)
- Low-voltage (LV)
What is the AC and DC for LV?
- AC - 50 to kV
- DC - 120 to 1.5kV
What happens at a current of 0.5-2?
Threshold of perception
What happens at a current of 2-10?
A painful sensation, increasing with the current
What happens at a current of 10-25?
- cramps & inability to let go
- Increase in blood pressure
- Breathing difficulties caused by muscular contractions of the lungs
What happens at a current of 25-50?
- Several muscular contractions sometimes with bone fractures
- Increase in blood pressure
- Loss of consciousness from heart and breathing failure
What happens at a current of 50?
- Burnt at point of contact
- Death from heart failure
How to perform safe isolation for someone who’s been electrified?
Don’t touch the person with bare hands until they are far away from the electrical source
How to move someone who’s electrified?
Use insulating materials (wood, newspaper, etc) to move them, if the electrical supply cannot be turned off
What are the two ways of receiving an electrical shock?
- contact due to failure of basic protection
- Through poor fault protection
What is basic protection?
touching something you would expect to be live
What is fault protection?
Touching part of an electrical system that only goes live under fault protection
