QOD for 10/23/08 Electrical

[gbeaumont (Gerry Beaumont)]

Hi to all,

here is a very interesting question, with a surprising answer :shock:

Regards

Gerry

[badair (Barry Adair, EIFSTX#39)]

answer

[mnahrgang (Mark Nahrgang, C.R.I.)]

@badair

answer

Barry,
I couldn’t find the answer on the page. Can you be a little more specific?
Thanks

[badair (Barry Adair, EIFSTX#39)]

@mnahrgang

Barry,
I couldn’t find the answer on the page. Can you be a little more specific?
Thanks

Reread NEMA 1-15 or check your PM
hth

[gbeaumont (Gerry Beaumont)]

@badair

Reread NEMA 1-15 or check your PM
hth

Barry,

Nope, that section doesn’t address the question.

You all know me better than that, if the question looks simple there’s usually a trap :mrgreen::mrgreen:

Have fun

BTW, the correct answer can be found here , happy reading

Regards

Gerry

[jmckee (James McKee)]

@gbeaumont

Barry,

Nope, that section doesn’t address the question.

You all know me better than that, if the question looks simple there’s usually a trap :mrgreen::mrgreen:

Have fun

BTW, the correct answer can be found here , happy reading

Regards

Gerry

there’s a lot of good information there Gerry…not quite through it myself but good stuff …

[gbeaumont (Gerry Beaumont)]

@jmckee

there’s a lot of good information there Gerry…not quite through it myself but good stuff …

I agree Jim, that is the best thing I have read this year, it’s very informative, a required read for all home inspectors.

Regards

Gerry

[mcyr (Marcel Cyr, CMI)]

Barry, that might be when it was first invented, but when was it actually used in the building residential market.?

I can go back to the early 60’s and not find three prong receptacles in Maine. I know Maine is ten years behind time, ha. ha., but I think it took a while for the three prongs to hit the markets in general.

Marcel :)

[jmckee (James McKee)]

@mcyr

Barry, that might be when it was first invented, but when was it actually used in the building residential market.?

I can go back to the early 60’s and not find three prong receptacles in Maine. I know Maine is ten years behind time, ha. ha., but I think it took a while for the three prongs to hit the markets in general.

Marcel :)

but the question is when were they first required …not first available…that is quite a difference I think…

[gbeaumont (Gerry Beaumont)]

@mcyr

Barry, that might be when it was first invented, but when was it actually used in the building residential market.?

I can go back to the early 60’s and not find three prong receptacles in Maine. I know Maine is ten years behind time, ha. ha., but I think it took a while for the three prongs to hit the markets in general.

Marcel :)

Interestingly, grounded outlets were first granted patent in 1928 if I remember correctly.

Regards

Gerry

[mcyr (Marcel Cyr, CMI)]

@gbeaumont

Interestingly, grounded outlets were first granted patent in 1928 if I remember correctly.

Regards

Gerry

I agree with that Gerry, but as Jim said, when was it first required?

My guess would be:
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.

And I am guessing, can’t find backup. ha. ha.

Marcel :)

[lkage (Larry Kage, CMI)]

@gbeaumont

Interestingly, grounded outlets were first granted patent in 1928 if I remember correctly.

Regards

Gerry

Yes, that’s what I found.

I’d say that puts Maine farther than 10 years behind but all the states waited quite a while it appears.

[ccurrins (Christopher Currins, CMI)]

Some History of Residential Wiring Practices in the U.S**.**

http://www.electricity.state.mn.us/pdf/GFCI_history.pdf

[mcyr (Marcel Cyr, CMI)]

Thanks Chris, that was a good link.

Marcel :)

[ccurrins (Christopher Currins, CMI)]

@mcyr

Thanks Chris, that was a good link.

Marcel :)

You can thank Gerry, I probably wouldn’t have found it without his question. Though I did answer yesterday, 60’s. Looks now like kind of a trick question.

[gbeaumont (Gerry Beaumont)]

Hi to all,

OK this one is going to be fun

The correct answer is 1940’s

Homes built before the 1960’s had most of their original 125 V receptacle outlets of the non-grounding type (2-prong) (see Fig. 14). In 1947, the Code first required grounding type (3-prong) receptacles for the laundry. In 1956 the required use of grounding type receptacles was extended to basements, garages, outdoors and other areas where a person might be standing on ground. Finally, in 1962 the Code was revised to require all branch circuits to include a grounding conductor or ground path to which the grounding contacts of the receptacle must be connected. That effectively discontinued the use of non-grounding type receptacles except for replacement use in existing installations were a grounding means might not exist.

Regards

Gerry

[badair (Barry Adair, EIFSTX#39)]

@gbeaumont

Hi to all,

OK this one is going to be fun

The correct answer is 1940’s

Regards

Gerry

Gerry,

This isn’t the first or last time this chump has been stumped.
Thanks for the education, I guess :oops:

[gbeaumont (Gerry Beaumont)]

@badair

Gerry,

This isn’t the first or last time this chump has been stumped.
Thanks for the education, I guess :oops:

Hi mate, you’re far from being alone on that one, in fact if I had been answering that question prior to this week I would have also got it wrong, I knew the outside 3 pins went back to the 50’s, but I don’t think I ever read about the laundry issue prior to that.

I guess we all learn something, ain’t that the way it should be?

Regards

Gerry

[ccurrins (Christopher Currins, CMI)]

I didn’t know they had washing machines and dryers in the 40’s.

[jmckee (James McKee)]

good question and information …not that i or anyboby else got it right are You planning on making us look stupid again tomorrow Gerry ???