- #1
Chantry09
- 61
- 0
Homework Statement
a) You have been asked to design a convector heater (electric radiator) which has a metal body. Detail an appropriate method of preventing electric shock for users of this product, and show how such a protection strategy could be implemented in your design. (15)
b) Describe the effects of electric current on the human body. (5)
2. The attempt at a solution
For part A would i just mention about connecting the Earth wire to the metal casing and describe how the Earth wire stops the user from getting a shock? I could also talk about insulating the live components so that the user isn't able to easily touch them. Is there anything else i should be talking about? Its 15 marks so i think i need more.
For part B what five things should i be mentioning? I found this on the internet, if i put this in the exam do you think that would be enough?:
More than 3 ma painful shock
More than 10 ma muscle contraction 'no-let-go' danger
More than 30 ma lung paralysis- usually temporary
More than 50 ma possible ventricular fob. (heart dysfunction, usually fatal)
100 ma to 4 amps certain ventricular fibrillation, fatal