QOD for 10/23/08 Electrical

[Gerry Beaumont]

Hi to all,

here is a very interesting question, with a surprising answer

Regards

Gerry

[Barry Adair]

answer

[Mark Nahrgang]

Originally Posted by badair

answer

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

[Barry Adair]

Originally Posted by 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

[Gerry Beaumont]

Originally Posted by 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

Have fun

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

Regards

Gerry

[James F. McKee]

Originally Posted by 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

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 ...

[Gerry Beaumont]

Originally Posted by 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

[Marcel R. Cyr]

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

[James F. McKee]

Originally Posted by 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...

[Gerry Beaumont]

Originally Posted by 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

[Marcel R. Cyr]

Originally Posted by 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

[Larry D. Kage]

Originally Posted by 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]

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


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

[Marcel R. Cyr]

Thanks Chris, that was a good link.

Marcel

[ccurrins]

Originally Posted by 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.