Hello all, Yes, the holes are for retention, and UL498 specifies the holes must be chamfered to prevent them from cutting off the mating bumps in the outlet. The holes are optional, but plugs have to pass retention tests either way.
Mike Harris/Teccom Co. (Product Safety Consulting) 707-258-1360/fax 1361 ---------- > From: Patrick Lawler <plaw...@west.net> > To: emc-p...@majordomo.ieee.org > Subject: Re: Plugs for China > Date: Wednesday, October 21, 1998 11:00 AM > > I just looked at a hospital-grade cord, and it had solid, nickel-plated blades > _with_ a hole. > > Is the hole related to plug retention in the outlet? I thought I remembered > seeing small bumps on the mating blades inside the wall outlet. > > > On Wed, 21 Oct 1998 08:15:52 -0800, ed.pr...@cubic.com wrote: > >------------------------ > > From: ed.pr...@cubic.com > > Subject: Re: Plugs for China > > Date: Tue, 20 Oct 1998 16:06:42 -0800 > > To: EMC-PSTC <emc-p...@majordomo.ieee.org>, Millsaps Cindy-G14342 <g14...@ga25epd.mot.com> > > > > > >> > >> > >> ------------------------ > >> From: Millsaps Cindy-G14342 <g14...@ga25epd.mot.com> > >> Subject: Plugs for China > >> Date: Tue, 20 Oct 1998 16:10:33 -0400 > >> To: "'emc-p...@ieee.org'" <emc-p...@ieee.org> > >> > >> > >> > It seems that China now requires the plug blades to have no holes in them. Referring to the small round opening at the upper area of a US plug. > >> > >> > Thanks, > >> > >> > Cindy Millsaps > >> > Product Safety Engineer > >> > Motorola Energy Systems Group > >> > (770) 338-3288 > >> > FAX: (770) 338-3345 > >> > >> Sorry, Cindy, I'm of no help on your question. But, can anyone tell me just what those little circular holes in the High and Neutral plug blades are supposed to do? > >> > >And now, another little observation. I looked at some equipment with Hospital Grade cable plugs. These plugs had solid blades; no holes at all. And the blades were much more rigid, with slightly larger thickness and width than a standard plug (subjective, since I didn't have a caliper with me). I would think that this would create higher contact pressure with the female socket elements when mated. > > > >Also, the blades had what appeared to be a nickel plate finish. > > > >Regards, > > > >Ed > > > >-------------------------- > >Ed Price > >ed.pr...@cubic.com > >Electromagnetic Compatibility Lab > >Cubic Defense Systems > >San Diego, CA. USA > >619-505-2780 > >Date: 10/21/1998 > >Time: 08:15:53 > >-------------------------- > > > > > > > >--------- > >This message is coming from the emc-pstc discussion list. > >To cancel your subscription, send mail to majord...@ieee.org > >with the single line: "unsubscribe emc-pstc" (without the > >quotes). For help, send mail to ed.pr...@cubic.com, > >j...@gwmail.monarch.com, ri...@sdd.hp.com, or > >roger.volgst...@compaq.com (the list administrators). > > -- > Patrick Lawler > plaw...@west.net > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to majord...@ieee.org > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to ed.pr...@cubic.com, > j...@gwmail.monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
