99Views3Replies

Author Options:

Safety, Electricity and Death Answered

I came across this AC safety info and found it useful enough to share.

Link: www.cdc.gov/niosh/docs/98-131/overview.html

FTA:
1 mA Barely perceptible
16 mA Max current an average person can grasp and let go
20 mA Paralysis of respitory muscles
100 mA Ventricular fibrillation threshold
2 Amps Cardiac standstill and internal organ damage
15/20 Common fuse or breaker opens circuit

I later found this DC info...

Link: www.allaboutcircuits.com/vol_1/chpt_3/4.html

FTA:
"AC ... is 3 to 5 more dangerous than DC of the same voltage and amperage."

Slight sensation felt at hands
DC
Men: 1.0mA, Women: 0.6mA

60 Hz AC
Men: 0.4mA, Women: 0.3mA

 ...

Painful, but voluntary muscle control maintained
DC
Men: 62mA, Women: 41mA

60 Hz AC
Men: 9mA, Women: 6mA

...

"In industry, 30 volts is generally considered to be a conservative threshold value for dangerous voltage. The cautious person should regard any voltage above 30 as theratening, not relying on normal body resistance for protection against shock."

3 Replies

user
Goodhart (author)2010-01-11
about your final comment:  this means that even your phone line wires, if bare, can be dangerous (I have actually received a rather nasty jolt, while installing a "modular socket" into an old wall junction); I happened to be touching both wires when someone "rang me up" (about 90 v).  It wasn't pleasant, for sure. 
 

Select as Best AnswerUndo Best Answer

user
NachoMahma (author)Goodhart2010-01-11

.  It's true! That pulsing ~90V will at least scare the crap out of you and possibly hurt yourself getting away from it.

Select as Best AnswerUndo Best Answer

user
Doctor What (author)Goodhart2010-01-11

That sounds fun!  I can't wait.  I'll have to try that tonight.

Select as Best AnswerUndo Best Answer