Path: utzoo!attcan!uunet!husc6!bloom-beacon!gatech!mcnc!ece-csc!ncrcae!ncr-sd!ncrlnk!ncrwat!swdev!tp2!howard
From: howard@tp2.Waterloo.NCR.COM (Howard F. Steel)
Newsgroups: sci.electronics
Subject: Re: WHat are those holes for?
Summary: Safety...
Message-ID: <187@tp2.Waterloo.NCR.COM>
Date: 18 Jul 88 12:12:12 GMT
References: <10790@oberon.USC.EDU>
Organization: NCR Canada Ltd., Waterloo, Ont, Canada
Lines: 11

In article <10790@oberon.USC.EDU>, robiner@ganelon.usc.edu (Steve) writes:
> 
> Why do standard electrical plugs have holes in the metal prongs?

The holes serve (or served) as detents for the mating ends. A small knob on the
mating surface of the outlet notched into the hole to make accidental removal
less likely (especially after the socket has aged and worn a bit).

-- 
Howard FP Steel :-( 		I Think, Therefore, I Am
aka: "The Duck" :-)			I Think