Patrick, You are correct. The small "bumps" in the contact blades of the wall outlet are designed to mate with the holes of the attachment plug blades. My understanding is that holes in the blades and bumps on the wall outlet contacts are optional. However, if the holes and bumps are used, the dimensions must meet the criteria specified in the standard. In the US, UL 817 gives dimensional requirements for the bumps and holes.
Best Regards, Kendall Wilcox Fujitsu Computer Products of America [email protected] (Patrick Lawler) on 10/21/98 11:00:41 AM Please respond to [email protected] (Patrick Lawler) To: [email protected] cc: (bcc: Kendall Wilcox/Orch/SJ/FCPA/Fujitsu) Subject: Re: Plugs for China 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, [email protected] wrote: >------------------------ > From: [email protected] > Subject: Re: Plugs for China > Date: Tue, 20 Oct 1998 16:06:42 -0800 > To: EMC-PSTC <[email protected]>, Millsaps Cindy-G14342 > <[email protected]> > > >> >> >> ------------------------ >> From: Millsaps Cindy-G14342 <[email protected]> >> Subject: Plugs for China >> Date: Tue, 20 Oct 1998 16:10:33 -0400 >> To: "'[email protected]'" <[email protected]> >> >> >> > 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 >[email protected] >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 [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
