Article View: sci.electronics
Article #1157Re: Re: Touching a "hot" connector
From: Dennis Ferguson
Date: Thu, 10 Aug 1989 03:11
Date: Thu, 10 Aug 1989 03:11
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2101 bytes
In article <17660006@hpfcdj.HP.COM> myers@hpfcdj.HP.COM (Bob Myers) writes: > >> It doesn't matter wether it's 120 or 220, They're both >> lethal. It's not the volts that kill, it's the amps. > > >Y'know, that last is said often enough that people are starting to repeat >it as Holy Writ without actually understanding it. Yes, it is the amount >of current passing through the body (particularly the heart itself) which >determines whether or not you'll just get a tingle, or wind up as a customer >of the local coroner.... Actually, the problem with 220 and 120v is partially the 60Hz. Most electrocution deaths are the result of fibrillation of the heart. The 60Hz current wrecks the timing to the heart... resulting in spasms that prevent pumping action. The tissue itself is undamaged. Fibrillation can also occur as a result of other circumstances and has been induced in heart patients with very low currents (microamps). The classic recovery procedure is to use a dibrillator which applies a *high* voltage charge across the heart, clearing the spasms and restarting the heart. I once worked for a power company as a communications engineer and we had a technician go into a substation to read the serial numbers off a capacitor bank. He bent down to read the numbers and lost his balance, falling backwards onto the capacitors. The capacitors, charged to 7500 volts, discharged through his body (the capacitors were across a distribution line for power factor correction). He lived. Dennis
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arc1-ca.pugleaf.net!utzoo!utgpu!watmath!att!tut.cis.ohio-state.edu!purdue!mailrus!csd4.milw.wisc.edu!srcsip!maitai!fergusonReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!att!tut.cis.ohio-state.edu!purdue!mailrus!csd4.milw.wisc.edu!srcsip!maitai!ferguson From: ferguson@maitai.SRC.Honeywell.COM (Dennis Ferguson) Newsgroups: sci.electronics Subject: Re: Re: Touching a "hot" connector Message-ID: <27515@srcsip.UUCP> Date: 10 Aug 89 03:11:05 GMT References: <248@sopwith.UUCP> <17660006@hpfcdj.HP.COM> Sender: news@src.honeywell.COM Reply-To: ferguson@maitai (Dennis Ferguson) Followup-To: ferguson@src.honeywell.com Organization: Honeywell, Systems & Research Center, Camden, MN Lines: 30