Article View: sci.electronics
Article #19453Re: WHat are those holes for?
From: Michael Hermann
Date: Mon, 18 Jul 1988 19:07
Date: Mon, 18 Jul 1988 19:07
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In article <10790@oberon.USC.EDU>, robiner@ganelon.usc.edu (Steve) writes:
> I'm sure this is below the level of most of the people in this group,
> but...
>
> Why do standard electrical plugs have holes in the metal prongs?
>
> =Steve=
Lots of industrial type units for three-phase power etc. have a locking
mechanism that either involves rotating the plug, or using a latch that locks
some internal pins into the plug thru the holes. Safety feature, prevents
accidental disconnection (ie. seen these outlets in hospitals, where heart
monitors etc. are plugged in).
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!lll-lcc!ames!pasteur!ucbvax!ucsd!rutgers!uwvax!oddjob!gargoyle!att!alberta!calgary!hermann From: hermann@calgary.UUCP (Michael Hermann) Newsgroups: sci.electronics Subject: Re: WHat are those holes for? Summary: Holes in electrical plugs Message-ID: <1752@vaxb.calgary.UUCP> Date: 18 Jul 88 19:07:44 GMT References: <10790@oberon.USC.EDU> Organization: U. of Calgary, Calgary, Ab. Lines: 19