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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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American 3 pin mains plug and socket
The third grounding pin seems to be always round and with no taper in any
sense. The socket I have here has a ground-pin recess that is a conflation of a semicircle and half a square in cross section . Equally solid, ie no springing action. Or is there a taper down the length of the ground pin recess that I cannot gauge . I expected a round pin with a tapered flat and a slot along the length of the pin to give some sprung gripping/ latitude for dimensional inconsistency. While at it, are the holes in each flat pin , for anti-tugging latch pins ? |
#2
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American 3 pin mains plug and socket
On 8/5/2011 10:06 AM, N_Cook wrote:
While at it, are the holes in each flat pin , for anti-tugging latch pins ? That's to make it easier to connect solid wire from the outlet box directly to the plugs when you're too cheap to buy a new receptacle. Jeff -- "Everything from Crackers to Coffins" |
#3
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American 3 pin mains plug and socket
Jeffrey Angus wrote in
: On 8/5/2011 10:06 AM, N_Cook wrote: While at it, are the holes in each flat pin , for anti-tugging latch pins ? That's to make it easier to connect solid wire from the outlet box directly to the plugs when you're too cheap to buy a new receptacle. Jeff IIRC,a new receptacle costs less than $1 at Wal-Mart. BTW,I've seen a lot of US power plugs with ground pins that are folded sheet brass that has the half-round/half-square,or U-shape cross- section,with a bevel at the end. Maybe cheaper to make than a solid round pin? the holes in the flat blades are probably a leftover originally intended for some sort of detent (ball detent?)to help retain the plug. -- Jim Yanik jyanik at localnet dot com |
#4
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American 3 pin mains plug and socket
Jim Yanik wrote in message
4... Jeffrey Angus wrote in : On 8/5/2011 10:06 AM, N_Cook wrote: While at it, are the holes in each flat pin , for anti-tugging latch pins ? That's to make it easier to connect solid wire from the outlet box directly to the plugs when you're too cheap to buy a new receptacle. Jeff IIRC,a new receptacle costs less than $1 at Wal-Mart. BTW,I've seen a lot of US power plugs with ground pins that are folded sheet brass that has the half-round/half-square,or U-shape cross- section,with a bevel at the end. Maybe cheaper to make than a solid round pin? the holes in the flat blades are probably a leftover originally intended for some sort of detent (ball detent?)to help retain the plug. -- Jim Yanik jyanik at localnet dot com I should have said I am in the UK Now you say that I've seen a plug with a U channel ground pin ,somewhere along the way. I could see that arrangement maybe giving some sort of sprung/ tolerating fit. But how does a cylindrical brass pin make good contact with an unsprung receptacle pin ? |
#5
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American 3 pin mains plug and socket
N_Cook wrote:
Jim Yanik wrote in message 4... Jeffrey Angus wrote in : On 8/5/2011 10:06 AM, N_Cook wrote: While at it, are the holes in each flat pin , for anti-tugging latch pins ? That's to make it easier to connect solid wire from the outlet box directly to the plugs when you're too cheap to buy a new receptacle. Jeff IIRC,a new receptacle costs less than $1 at Wal-Mart. BTW,I've seen a lot of US power plugs with ground pins that are folded sheet brass that has the half-round/half-square,or U-shape cross- section,with a bevel at the end. Maybe cheaper to make than a solid round pin? the holes in the flat blades are probably a leftover originally intended for some sort of detent (ball detent?)to help retain the plug. -- Jim Yanik jyanik at localnet dot com I should have said I am in the UK Now you say that I've seen a plug with a U channel ground pin ,somewhere along the way. I could see that arrangement maybe giving some sort of sprung/ tolerating fit. But how does a cylindrical brass pin make good contact with an unsprung receptacle pin ? The internal split wiper pairs of the AC socket are under some tension, to make a good electrical contact, this holds for the ground pin as well. As for the holes in the flat pins, I can't find a reference easily but believe that they are for dimples in earlier sockets that are no longer present. It could also be that dimples exist in ceiling outlets only...you can do some hunting and report back! John :-#)# John :-#)# -- (Please post followups or tech enquiries to the newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
#6
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American 3 pin mains plug and socket
On Fri, 5 Aug 2011 17:45:14 +0100, "N_Cook" wrote:
Jim Yanik wrote in message . 44... Jeffrey Angus wrote in : On 8/5/2011 10:06 AM, N_Cook wrote: While at it, are the holes in each flat pin , for anti-tugging latch pins ? I should have said I am in the UK Now you say that I've seen a plug with a U channel ground pin ,somewhere along the way. I could see that arrangement maybe giving some sort of sprung/ tolerating fit. But how does a cylindrical brass pin make good contact with an unsprung receptacle pin ? All the outlets I've checked have some type of spring material on all the contacts. Some are better made than others (a receptacle with a brand I recognize versus a $1 nameless duplex receptacle at WalMart). I spent a bit more for the 20 amp receptacle that sees use with a table saw and a small wirefeed welder. The saw can hit 20 amps at startup and the welder can run near 20 amps continuously, but I rarely have the arc going for more than a 30 seconds at a time - I'm not building bridges, just welding small things such as a hanger for a garden hose or repairing a metal stand for a bird feeder. John |
#7
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American 3 pin mains plug and socket
On Fri, 05 Aug 2011 10:00:16 -0700, John Robertson wrote:
As for the holes in the flat pins, I can't find a reference easily but believe that they are for dimples in earlier sockets that are no longer present. It could also be that dimples exist in ceiling outlets only...you can do some hunting and report back! I have seen, in the past, 'security' locks (both metal and plastic) that engage both the mains pins through these holes and prevent insertion into an outlet. Probably NOT what the holes are for, but such a lock could be A Good Idea on some appliances or equipment in an environment with children. Jonesy -- Marvin L Jones | jonz | W3DHJ | linux 38.24N 104.55W | @ config.com | Jonesy | OS/2 * Killfiling google & XXXXbanter.com: jonz.net/ng.htm |
#8
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American 3 pin mains plug and socket
"N_Cook" wrote in :
Jim Yanik wrote in message 4... Jeffrey Angus wrote in : On 8/5/2011 10:06 AM, N_Cook wrote: While at it, are the holes in each flat pin , for anti-tugging latch pins ? That's to make it easier to connect solid wire from the outlet box directly to the plugs when you're too cheap to buy a new receptacle. Jeff IIRC,a new receptacle costs less than $1 at Wal-Mart. BTW,I've seen a lot of US power plugs with ground pins that are folded sheet brass that has the half-round/half-square,or U-shape cross- section,with a bevel at the end. Maybe cheaper to make than a solid round pin? the holes in the flat blades are probably a leftover originally intended for some sort of detent (ball detent?)to help retain the plug. -- Jim Yanik jyanik at localnet dot com I should have said I am in the UK I think you did. Now you say that I've seen a plug with a U channel ground pin ,somewhere along the way. I could see that arrangement maybe giving some sort of sprung/ tolerating fit. But how does a cylindrical brass pin make good contact with an unsprung receptacle pin ? AFAIK,the receptacle female contacts are one-piece,formed from sheet stock,and the blade or ground pin goes in between the sides,spreading them apart slightly. the female contacts have some springiness built in. They are like a very deep U shape. BTW,I checked a "hospital-grade" plug,and it's ground pin is U-shaped flat stock,as I described earlier. Pretty heavy gauge stock,around 1/16" thick. -- Jim Yanik jyanik at localnet dot com |
#9
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American 3 pin mains plug and socket
On Fri, 5 Aug 2011 16:06:10 +0100, "N_Cook" wrote:
While at it, are the holes in each flat pin , for anti-tugging latch pins ? Close - spring loaded pins with a ball-shaped end, designed to hold the blade in the outlet. As better alloys were developed the construction became much simpler, but the detents remained. PlainBill |
#10
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American 3 pin mains plug and socket
I came across an old bakellite 3 pin USA receptacle yesterday. The third pin
socket in that was 2 definite sprung flat contacts, touching across a diameter of the pin |
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