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Ground prong??

G

Greg1959

Well-known Member
When was the 3rd prong Ground introduced for grounding?
I am rebuilding a meat slicer.
My tractor brings the carcass to the shop.
 
When I was a carpenter at UNMC, they wanted the third prong up! Theory being if something falls in there, it will hit the ground first. I never could get used to the look!
 
(quoted from post at 02:41:34 02/05/14) When I was a carpenter at UNMC, they wanted the third prong up! Theory being if something falls in there, it will hit the ground first. I never could get used to the look!
Click to expand...
Yep, that's what they say but look at a refrigerator plug and see which way you think a receptacle should be.
 
"When was the 3rd prong Ground introduced for grounding?"

Probably about 2 seconds before the first one was cut off! LOL
 
I was at work one night in the machine shop. A piece of sheet metal stacked beside a wall. Slid right between the plug, and wall and caused a spark big enough to scare me. I can see where if the ground was up that would not have happened. Stan
 
Doesn't make any difference, I've got some that face Left or Right depending on the situation & location. "Normally" they face Down, but then again define "Normal". What is normal for one person may NOT be normal for the next. To each his own. lol
 
(quoted from post at 04:17:02 02/05/14) Doesn't make any difference, I've got some that face Left or Right depending on the situation & location. "Normally" they face Down, but then again define "Normal". What is normal for one person may NOT be normal for the next. To each his own. lol
Click to expand...
hadda ya want? a happy face or a bullet hole in forehead?
 
I think it's pretty disappointing that it wasn't standardized years ago! I was told by an inspector once that he preferred to see the ground on the bottom so that if it starts to pull out the ground is the last to disconnect. Makes sense to me!
 
Every time this subject comes up it makes me laugh a bit about the grounded duplex socket in my garage. I have two upright freezers side by side, both plugged into the same duplex socket.
One freezer plug has the ground opposite of the other in the plug, so one plugs cord hangs straight down, while the other makes a 180 turn to hang down.
The best compromise woiuld be to mount the duplex socket on it's side so both cords have to make a 90 degree turn ;-)
 
Seriously though, I would put a ground on it, even if it didn't come with one. If it's old enough to have had the old cloth covered cord, it can be bought for restoration, I'm sure it comes in 3 conductor too.
 
found this on the web. Bill

The first NEC requirements for grounded receptacles in residences was for bathrooms and kitchens. This requirement was in place by 1961. The NEC requirement for all receptacles to be grounded was some time after 1965. My Code books are not near the computer.
 
I have a handsaw with a couple of notches in the back edge where it dropped onto a plug.
 
First one I ever saw was on a portable dishwasher my folks bought when I was about five years old. Which would have made it 1962. I would put one on your meat slicer, given that it's almost certainly not double-insulated and you'll probably want to operate it some place where you don't have a GFCI outlet.
 
I cant tell you in which year or which edition of the NEC the third GroundING wire was required, but if I had an appliance with an outer metallic conductive case/shell, I would install and use a 3 wire cord and 3 wire GroundING plug and receptacle with the Green GroundING wire attached to the metal case AS IT COULD SAVE YOUR LIFE!!!!

When I attended a National Electrical Code Seiminar (Instructor was Joe McPartland or Mike Holt if I recall) they advised we install outlets with the GroundING terminal on top because if something (say a necklace etc) dropped down and the plug wasn't fully inserted, the Ground wire would be the first to make contact.

GFCI became a requirement after the three wire plug and receptacle requirement, two different things and designs going on with those.


John T Long retired Electrical Engineer and rusty on latest codes
 
I heard that as well - about putting the ground plug upside down for that reason.

But I also heard it has another benefit - small children are less likely to play with the plug that way.

With the ground plug down, it's more inviting - like a little face. Upside down - they're just less inclined to play with it.

Not sure what the true statistics are, but thought it was interesting if true.
 
As a home remodeler, I could always tell if a 'Billy Bob' had been involved in the wiring as the outlets would be the of the 'face' style. Too many so-called 'professionals' have little idea of why things are set up as they are. Kind of fun to see Television and Movies that have the same wrong ideas.
 
I take Chemo at a large hospital where the ground prong is on top on all the "outlets" I see. Today, wife and I ate at a restaurant, and they are all on the bottom.
 
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